2006 MERCEDES-BENZ SPRINTER heating

TABLE OF CONTENTS
1.0 INTRODUCTION.........................................................1
1.1SYSTEM COVERAGE...............................................1
1.2SIX-STEP TROUBLESHOOTING PROCEDURE..........................1
2.0 IDENTIFICATION OF SYSTEM.............................................1
3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION......................1
3.1AIRBAG SYSTEM...................................................1
3.1.1DRIVER AIRBAG............................................2
3.1.2CLOCKSPRING.............................................3
3.1.3PASSENGER AIRBAG.......................................3
3.1.4SEAT BELT TENSIONERS....................................3
3.1.5SPECIAL TOOLS............................................3
3.1.6DIAGNOSTIC TROUBLE CODES..............................4
3.1.6.1ACTIVE CODES............................................4
3.1.6.2STORED CODES...........................................4
3.2COMMUNICATION..................................................4
3.2.1COMMUNICATION K-LINES..................................4
3.2.2CAN BUS..................................................5
3.3HEATING & A/C SYSTEM............................................5
3.3.1AUTOMATIC TEMPERATURE CONTROL (ATC)..................5
3.3.1.1SYSTEM CONTROLS........................................5
3.3.1.2SYSTEM DIAGNOSTICS.....................................5
3.3.2CABIN HEATER MODULE (CHM) & HEATER BOOSTER MODULE
(HBM).....................................................7
3.3.2.1SYSTEM DESCRIPTION.....................................7
3.3.2.2VENTING THE HEATER'S EXHAUST...........................8
3.3.2.3SYSTEM DIAGNOSTICS.....................................8
3.4INSTRUMENT CLUSTER.............................................9
3.5POWER DOOR LOCKS/RKE..........................................9
3.5.1CENTRAL LOCKING.........................................9
3.5.2REMOTE KEYLESS ENTRY (RKE).............................9
3.5.3AUTO DOOR LOCKS.......................................10
3.5.4ACCIDENT RESPONSE.....................................10
3.6VEHICLE THEFT SECURITY SYSTEM (VTSS)..........................10
3.7USING THE DRBIIIT................................................11
3.8DRBIIITERROR MESSAGES.........................................11
3.9DRBIIITDOES NOT POWER UP (BLANK SCREEN)......................11
3.10DISPLAY IS NOT VISIBLE...........................................11
4.0 DISCLAIMERS, SAFETY, WARNINGS......................................11
4.1DISCLAIMERS.....................................................11
4.2SAFETY..........................................................11
4.2.1TECHNICIAN SAFETY INFORMATION.........................11
4.2.2VEHICLE PREPARATION FOR TESTING.......................12
4.2.3SERVICING SUB-ASSEMBLIES..............................12
4.2.4DRBIIITSAFETY INFORMATION.............................12
4.3WARNINGS.......................................................12
4.3.1VEHICLE DAMAGE WARNINGS..............................12
4.3.2ROAD TESTING A COMPLAINT VEHICLE......................12
i

TABLE OF CONTENTS - Continued
FLAME SENSOR SHORTED..............................................91
GLOW PIN OPEN.......................................................91
GLOW PIN SHORTED...................................................91
HEATER IN LOCKOUT MODE.............................................93
HEATER OVERHEATED..................................................93
SUCCESSIVE OVERHEATING............................................93
OVER VOLTAGE........................................................96
OVERHEATING SENSOR OPEN...........................................97
OVERHEATING SENSOR SHORTED.......................................97
TEMP SENSOR OPEN...................................................98
TEMP SENSOR SHORTED...............................................98
UNDER VOLTAGE......................................................99
COMMUNICATION
*NO RESPONSE FROM AIRBAG CONTROL MODULE.......................102
*NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL..............104
*NO RESPONSE FROM CABIN HEATER MODULE..........................106
*NO RESPONSE FROM CENTRAL TIMER MODULE.........................108
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE...................110
*NO RESPONSE FROM ENGINE CONTROL MODULE.......................112
*NO RESPONSE FROM HEATER BOOSTER MODULE.......................114
*NO RESPONSE FROM INSTRUMENT CLUSTER...........................116
*NO RESPONSE FROM RADIO..........................................118
*NO RESPONSE FROM SECURITY SYSTEM MODULE......................120
*NO RESPONSE FROM SENTRY KEY REMOTE ENTRY MODULE.............122
*NO RESPONSE FROM SHIFTER ASSEMBLY..............................124
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE................126
HEATING & A/C
A/C COMPRESSOR CONTROL HIGH OR OPEN (ACTIVE)....................128
A/C COMPRESSOR CONTROL HIGH OR OPEN (STORED)...................130
A/C COMPRESSOR CONTROL SHORTED LOW (STORED)...................130
AIR OUTLET TEMP SENSOR HIGH OR OPEN (STORED)....................130
AIR OUTLET TEMP SENSOR SHORTED LOW (STORED)....................130
AUX FAN RELAY CONTROL HIGH OR OPEN (STORED).....................130
AUX FAN RELAY CONTROL SHORTED LOW (STORED).....................130
BLOWER STAGE 1 HIGH OR OPEN (STORED).............................130
BLOWER STAGE 1 SHORTED LOW (STORED).............................130
CABIN HEATER CONTROL HIGH OR OPEN (STORED)......................130
CABIN HEATER CONTROL SHORTED LOW (STORED)......................130
CIRC PUMP CONTROL HIGH OR OPEN (STORED).........................130
CIRC PUMP CONTROL SHORTED LOW (STORED).........................130
EVAP TEMP SENSOR HIGH OR OPEN (STORED)..........................130
EVAP TEMP SENSOR SHORTED LOW (STORED)..........................130
NO COMMUNICATION BUS (STORED)....................................130
NO COMMUNICATION WITH ECM (STORED)..............................130
NO COMMUNICATION WITH IC (STORED).................................130
RECIRC AIR SOLENOID CONTROL HIGH OR OPEN (STORED)...............130
RECIRC AIR SOLENOID CONTROL SHORTED LOW (STORED)...............130
REFRIG PRESS SENSOR HIGH OR OPEN (STORED).......................130
REFRIG PRESS SENSOR SHORTED LOW (STORED).......................130
WATER CYCLE VALVE CONTROL HIGH OR OPEN (STORED)................130
WATER CYCLE VALVE CONTROL SHORTED LOW (STORED)................130
iii

TABLE OF CONTENTS - Continued
VEHICLE THEFT/SECURITY
DRIVER CYLINDER LOCK SWITCH CIRCUIT SHORT TO GROUND............212
DRIVER CYLINDER UNLOCK SWITCH CIRCUIT SHORT TO GROUND.........214
FRONT DOOR JAMB SWITCH CIRCUIT SHORT TO GROUND................216
INTERNAL ERROR - SSM...............................................218
TOWING INCLINATION SENSOR BEYOND LIMITS..........................218
TOWING INCLINATION SENSOR VALUE IS INVALID.........................218
TOWING INCLINATION SENSOR VALUE IS MISSING........................218
INTRUSION SENSOR 1 CIRCUIT OPEN/SHORT TO GROUND................220
INTRUSION SENSOR 1 GROUND CIRCUIT OPEN..........................222
INTRUSION SENSOR 2 CIRCUIT OPEN/SHORT TO GROUND................223
INTRUSION SENSOR 2 GROUND CIRCUIT OPEN..........................225
INTRUSION SENSOR 3 CIRCUIT OPEN/SHORT TO GROUND................226
INTRUSION SENSOR 3 GROUND CIRCUIT OPEN..........................228
REAR OR SLIDING DOOR JAMB SWITCH CIRCUIT SHORT TO GROUND......229
RKE INTERFACE CIRCUIT FAILURE - SSM................................231
SECURITY SYSTEM INTERFACE FAILURE - SSM...........................233
SIREN CIRCUIT OPEN/SHORTED TO GROUND............................235
SIREN INTERNAL FAILURE.............................................237
SIREN SIGNAL CONTROL CIRCUIT SHORT TO GROUND....................238
WINDSHIELD WIPER & WASHER
CHECKING THE RAIN SENSOR/WIPER OPERATION........................239
VERIFICATION TESTS
VERIFICATION TESTS..................................................244
8.0 COMPONENT LOCATIONS..............................................249
8.1AIRBAG SYSTEM.................................................249
8.2AIRBAG CONTROL MODULE.......................................249
8.3DRIVER AIRBAG SQUIB...........................................249
8.4CLOCKSPRING..................................................250
8.5SEAT BELT TENSIONER...........................................250
8.6HEATING & A/C...................................................250
8.6.1AUTOMATIC TEMPERATURE CONTROL (ATC) SYSTEM
COMPONENTS...........................................250
8.6.2CABIN HEATER & HEATER BOOSTER SYSTEM COMPONENTS .251
8.6.3AUTO TEMP CONTROL, CABIN HEATER, & HEATER BOOSTER
FUSES & RELAYS........................................251
8.6.4EVAP TEMP SENSOR & AIR OUTLET TEMP SENSOR..........251
8.7INSTRUMENT CLUSTER...........................................252
8.7.1AMBIENT TEMPERATURE SENSOR.........................252
8.8POWER DOOR LOCKS/RKE........................................252
8.8.1CENTRAL TIMER MODULE.................................252
8.8.2SENTRY KEY REMOTE ENTRY MODULE.....................253
8.8.3DOOR LOCK MOTOR/AJAR SWITCH........................253
8.8.4CONTACT PLATES........................................253
8.8.5DOOR LOCK MOTOR/AJAR SWITCH CONNECTORS...........254
v

TABLE OF CONTENTS - Continued
FUSES (FUSE BLOCK NO. 2)............................................274
FUSES (FUSE BLOCK NO. 3)............................................276
FUSES (FUSE/RELAY BLOCK)...........................................278
HOOD AJAR SWITCH - BLACK...........................................278
HORN (VTSS).........................................................278
IGNITION LOCK SWITCH - BLACK........................................278
INSTRUMENT CLUSTER C1.............................................279
INSTRUMENT CLUSTER C2 - WHITE.....................................279
INTRUSION SENSOR NO. 1 - BLACK.....................................279
INTRUSION SENSOR NO. 2 - BLACK.....................................279
INTRUSION SENSOR NO. 3 - BLACK.....................................280
MASTER DOOR LOCK SWITCH..........................................280
PANIC ALARM SWITCH - BLACK.........................................280
FUSES (PDC).........................................................281
RADIO C1 - BLACK....................................................282
RADIO C2............................................................282
RECIRCULATED AIR SOLENOID VALVE...................................282
REFRIGERANT PRESSURE SENSOR.....................................282
A/C AUXILIARY FAN RELAY (RELAY BLOCK)...............................284
CIRCULATION PUMP RELAY-CABIN HEATER MODULE (RELAY BLOCK).......284
D+ RELAY NO. 2 (RELAY BLOCK)........................................284
FAN STAGE 1 RELAY (RELAY BLOCK)....................................284
OPTIONAL EQUIPMENT RELAY (RELAY BLOCK)...........................284
REMOTE KEYLESS ENTRY ANTENNA....................................284
SEAT BELT SWITCH...................................................284
SEAT BELT TENSIONER-DRIVER - YELLOW...............................285
SEAT BELT TENSIONER-PASSENGER - YELLOW...........................285
SECURITY SYSTEM MODULE C1 - BROWN...............................285
SECURITY SYSTEM MODULE C2 - LT. GREEN.............................286
SENTRY KEY REMOTE ENTRY MODULE (SKREEM)........................286
SHIFTER ASSEMBLY - BLACK...........................................286
SIREN - BLACK.......................................................286
STEERING ANGLE SENSOR............................................287
TOWING/INTRUSION SENSOR ON/OFF SWITCH...........................287
TRANSMISSION CONTROL MODULE C1 - BLACK..........................287
TRANSMISSION CONTROL MODULE C2 - BLACK..........................288
WATER CYCLE VALVE..................................................288
WINDOW DEFOGGER-LEFT REAR.......................................288
WINDOW DEFOGGER-RIGHT REAR......................................288
10.0 SCHEMATIC DIAGRAMS................................................289
10.1AIRBAG SYSTEM.................................................289
10.2COMMUNICATION................................................290
10.2.1COMMUNICATION K-LINES................................290
10.2.2CAN BUS NETWORK......................................291
10.3HEATING & A/C...................................................292
10.3.1AUTOMATIC TEMPERATURE CONTROL (ATC)................292
10.3.2CABIN HEATER MODULE (CHM)............................293
10.3.3HEATER BOOSTER MODULE (HBM).........................294
10.4INSTRUMENT CLUSTER...........................................295
vii

3.2.2 CAN BUS
The CAN bus (controller area network) is a data
bus system specifically design for inter module
communication on this vehicle. The CAN bus con-
sists of a special twisted two-core cable. Control
modules are connected to this9twisted pair9. The
CAN bus incorporates two terminating resistors.
One terminator is built into the Engine Control
Module (ECM) and the other is built into the Sentry
Key Remote Entry Module (SKREEM). Each resis-
tor has a value of 120 ohms. The resistor condition
can be confirmed by disconnecting the control mod-
ule and measuring the resistance value at the
appropriate control module pins. This measure-
ment should read 120 ohms. The two CAN circuits,
CAN C Bus (+) and CAN C Bus (-), are bridged by
these two terminating resistors when all control
modules are connected to the bus. These two resis-
tors are connected to the CAN bus network in
parallel. The measurement between the two
twisted CAN circuits, with both the ECM and
SKREEM connected, should measure a value of 60
ohms.
The CAN bus is bi-directional. This means that
each connected control module can send and receive
information. Transmission of data takes place re-
dundantly via both circuits. The data bus levels are
mirrored, meaning that if the binary level on one
circuit is 0, the other circuit transmits binary level
1 and vice versa. The two line concept is used for
two reasons: for fault identification and as a safety
concept.
If a voltage peak occurs on just one circuit, the
receivers can identify this as a fault and ignore the
voltage peak. If a short circuit or interruption
occurs on one of the two CAN circuits, a software-
hardware linked safety concept allows switching to
a single-line operation. The defective CAN circuit is
shut down. A specific data protocol controls how and
when the participants can send and receive.
NOTE: It is important to note the CAN Bus
circuits are used for inter-module
communication only, and is no way
connected to the K-Lines.
The following modules that use the CAN Bus on
this vehicle are:
²Automatic Temperature Control (ATC)
²Controller Antilock Brake (CAB)
²Engine Control Module (ECM)
²Instrument Cluster (IC)
²Sentry Key Remote Entry Module (SKREEM)
²Shifter Assembly (SA)
²Transmission Control Module (TCM)
3.3 HEATING & A/C SYSTEM
3.3.1 AUTOMATIC TEMPERATURE
CONTROL (ATC)
3.3.1.1 SYSTEM CONTROLS
The ATC Module:
²is fully addressable with the DRBIIIt.
IThe DRBIIItcommunicates with the ATC
Module through the Diagnostic Link Connector
(DLC) via a K-Line.
²communicates with other modules over the Con-
troller Area Network (CAN) C Bus.
²controls A/C clutch operation.
²controls EBL operation.
²controls water cycle valve operation.
IThe water cycle valve is a normally open valve,
meaning that it allows full engine coolant flow
through the heater core when no power is
delivered to the valve. The ATC controls the
valve with a pulse width signal. The lower the
percentage of the pulse width signal the more
the valve is open.
²controls Residual Heat Utilization (REST) func-
tion.
²controls blower motor operation, providing four
blower speeds (Low, M1, M2, & High).
²controls recirculation air solenoid valve.
²controls the mode door via cables.
²controls the main power supply to the Heater
Booster (if equipped).
²uses air inlet temperature sensor, air outlet tem-
perature sensor, and evaporator temperature
sensor input, as well as data from other modules
to maintain occupant comfort levels.
3.3.1.2 SYSTEM DIAGNOSTICS
Fault detection is through active and stored Diag-
nostic Trouble Codes (DTCs)
²DTCs are displayed by the DRBIIIt.
²Active DTCs are those which currently exist in
the system. The condition causing the fault must
be repaired in order to clear this type of DTC.
²Stored DTCs are those which occurred in the
system since the ATC Module received the last
9clear diagnostic info9message.
Testing Preparation & Diagnostics
Set the necessary system functions accordingly so
that all of the following prerequisites are met prior
to performing diagnostic tests on the ATC system:
5
GENERAL INFORMATION

1. Connect the DRBIIItto the DLC.
2. Place the shift lever in park.
3. Start the engine.
4. Set the blower to high speed.
5. Set the temperature selector to full cold.
6. Press air conditioning switch on.
7. With the DRBIIItin Sensors, verify that the:
A. ambient temperature is above 59F (15C).
B. refrigerant pressure is between 29 and 348
PSI (2 and 24 bar).
C. evaporator temperature is above 36.5F
(2.5C).
D. coolant temperature is above 158F (70C).
When all of the prerequisites have been met, use
the DRBIIItto record and erase all stored ATC
DTCs, and then select System Tests, and run the
ATC Function Test. When complete, check to see if
any active DTCs are present. If so, refer to the
symptom list in the Heating & A/C category for the
diagnostic procedure(s). If there are no DTCs
present, yet the performance seems less than ideal,
use the DRBIIItto look at all sensor values and the
status of the various inputs and outputs to see if
there is a deficiency detected that has not fully shut
down the system. For additional information, refer
to Sensor Values and Input/Output Status under
Diagnostic Tips in this section and to Section 11.0
for evaporator temperature sensor and air outlet
temperature sensor resistance to temperature spec-
ifications charts. Also, confirm that the water cycle
valve is functioning. Remember that the valve is
normally open. The pulse width signal will offer
insight into the valve's operation. The lower the
percentage number, the more open the valve be-
comes. Confirm that the valve is responding to the
signal from the ATC. If functioning correctly, verify
mode and blend door operation. If okay, the diagno-
sis then becomes purely refrigerant system related.
Attach the appropriate gauges and diagnose the
refrigeration system. Refer to the Service Informa-
tion for refrigerant system diagnostic procedures.
DIAGNOSTIC TIPS
SENSOR VALUES
Ambient Air Temperature
The Instrument Cluster transmits Ambient Air
Temperature Sensor data. In the event of a CAN
Bus communication failure, the last stored value is
displayed as a substitute value.
Interior Temperature
The normal range for the Interior Temperature
Sensor is from 32ÉF to 104ÉF. An implausible tem-
perature value indicates that the Interior Temper-
ature Sensor is bad. The repair in this case would be
to replace the ATC Module since the sensor is
integral to the module.Evaporator Temperature
The normal range for the Evaporator Temperature
Sensor is from 14ÉF to 104ÉF. A substitute value of
14ÉF with no updates indicates an Evaporator Tem-
perature Sensor circuit failure.
Air Outlet Temperature
The normal range for the Air Outlet Temperature
Sensor is from 32ÉF to 203ÉF. A substitute value of
111.1ÉF indicates an Air Outlet Temperature Sensor
circuit failure.
Coolant Temperature
The Engine Control Module transmits Coolant
Temperature Sensor date. In the event of a CAN
Bus communication failure, 257ÉF is displayed as a
substitute value.
Interior Temperature Controller
The normal range for the Blend control is from 62ÉF
to 144ÉF. This value represents the temperature set
by the operator. An implausible temperature value
or a temperature value that fails to change when
rotating the Blend control indicates that the Blend
control is bad. The repair in this case would be to
replace the ATC Module since the Blend control
integral to the module.
Refrigerant Pressure
The normal range for the Refrigerant Pressure
Sensor is from 29 PSI to 406 PSI. A substitute value
of 413 PSI indicates a Refrigerant Pressure Sensor
circuit failure. In addition, the normal range for
Pressure Sensor voltage is 0 volts to 5 volts. A value
of 0.9 volts indicates an open voltage supply circuit,
while a value of -999 indicates an open in all three
sensor circuits.
Water Cycle Valve
The normal range of the Water Cycle Valve is from
0% to 100%. The value indicates the extent to which
the valve is closed. A value of 100% indicates that
the valve is fully closed.
Intense Inst Light
The Instrument Cluster transmits this data. The
normal range for lighting intensity is from 0% to
100%. The value indicates the extent to which the
illumination has dimmed. A value of 0% indicates
bright while a value >0% indicates dimming. In the
event of a CAN Bus communication failure, 0% is
displayed as a substitute value.
INPUT/OUTPUT STATUS
Compressor Clutch
The ATC Module transmits this data. A status of
9ON9indicates that the compressor is operational. A
status of9OFF9indicates the compressor is not
operational.
6
GENERAL INFORMATION

reaching operating temperature. The heater's con-
trol unit controls and monitors combustion opera-
tion through various inputs and outputs that are
contained inside the heater assembly. The supple-
mental heater connects to the vehicle's heater hoses
and uses a separate fuel supply line and fuel pump
that connects to the vehicle's fuel tank. Unlike the
Heater Booster, the Cabin Heater Assembly has an
integral coolant pump which allows heater opera-
tion without the vehicle's engine running. In addi-
tion, a programmable timer module can also be
added to this system. Neither the Cabin Heater
Assembly nor the Heater Booster Assembly are
connected to the CAN Bus. Communication be-
tween the heater's control unit and the DRBIIIt
occurs through the Diagnostic Link Connector
(DLC) via a K-Line.
3.3.2.2 VENTING THE HEATER'S EXHAUST
WARNING: NEVER OPERATE THE HEATER
IN AN ENCLOSED AREA THAT DOES NOT
HAVE EXHAUST VENTILATION FACILITIES.
ALWAYS VENT THE HEATER'S EXHAUST
WHEN OPERATING THE HEATER. FAILURE
TO FOLLOW THESE INSTRUCTIONS CAN
RESULT IN PERSONAL INJURY OR DEATH.
WARNING:
ALLOW THE HEATER ASSEMBLY TO
COOL BEFORE PERFORMING A COMPONENT
INSPECTION/REPAIR/REPLACEMENT. FAILURE
TO FOLLOW THESE INSTRUCTIONS CAN
RESULT IN PERSONAL INJURY OR DEATH.
CAUTION: When using a powered exhaust
ventilation system, do not attach the exhaust
ventilation hose directly to the heater's
exhaust pipe. Too much suction can prevent
heater operation.
When using a powered exhaust ventilation sys-
tem, affix the ventilation hose to the heater's ex-
haust pipe or to the vehicle in such a manor that the
end of the ventilation hose remains approximately
three inches away from the end of the heater's
exhaust pipe.
When using a non-powered exhaust ventilation
system, affix the ventilation hose directly to the
heater's exhaust pipe.
3.3.2.3 SYSTEM DIAGNOSTICS
CAUTION: Always Perform The Heater
Pre-Test (In The Diagnostic Procedures) Prior
To Performing Any Other Test For The Test
Result To Be Valid.
Fault detection is through stored Diagnostic
Trouble Codes (DTCs). DTCs are displayed by the
DRBIIIt. The heater's control unit will store up to
five DTCs in its memory. If the control unit detects
a new fault in the system, one that is not already
stored in its memory, it will clear the oldest of the
five stored DTCs, and it will store the new fault's
DTC. If the control unit detects a reoccurrence of a
stored fault, it will overwrite that fault's DTC with
the most recent occurrence.
DIAGNOSTIC TIPS
SENSOR VALUES
Operating Voltage
The normal range for the Operating Voltage is from
10 volts to 15 volts. The value indicates the voltage
at the heater 's Fused B+ terminal.
Heating Capacity
The normal range for the heating capacity is from
0% to 100%. The value indicates the momentary
output of the auxiliary heater in % of the maximum
output.
Coolant Temperature
The value indicates the current coolant tempera-
ture.
Flame Sensor Resistance
The normal range for the Flame Sensor is from 750
ohms to 2270 ohms. The value indicates the mo-
mentary resistance of the Flame Sensor.
INPUT/OUTPUT STATUS
Dosing Pump
A status of9ON9indicates that the Dosing Pump is
operational. A status of9OFF9indicates the Dosing
Pump is not operational.
Glow Pin
A status of9ON9indicates that the Glow Pin is
energized. A status of9OFF9indicates the Glow Pin
is not energized.
Combustion Fan
A status of9ON9indicates that the Combustion Fan
is operational. A status of9OFF9indicates the
Combustion Fan is not operational.
Circulation Pump
A status of9ON9indicates that the Circulation
Pump is operational. A status of9OFF9indicates the
Circulation Pump is not operational.
Front End Blower
A status of9ON9indicates that the Blower Motor is
operational. A status of9OFF9indicates the Blower
Motor is not operational.
8
GENERAL INFORMATION

Static Heater Signal
A status of9ON9indicates that the heater module
sees the9Stationary Heating Mode ON9signal after
switching on the heater with the heater timer or the
auxiliary heater switch. A status of9OFF9indicates
that the9Stationary Heating Mode ON9signal is
not present at the heater module.
Heater Booster Mode Signal
A status of9ON9indicates that the heater module
sees the9Heater Booster Mode ON9signal after
switching on the heater with the auxiliary heater
switch. A status of9OFF9indicates that the9Heater
Booster Mode ON9signal is not present at the
heater module.
3.4 INSTRUMENT CLUSTER
The Instrument Cluster has easy-to-read instru-
ments, is capable of CAN bus communication and
provides a diagnostic function. The Instrument
Cluster with analog speedometer, tachometer, fuel
and coolant temperature gauges comes in two ver-
sions.
²Speedometer with outer miles-per-hour (mph)
scale and inner kilometers-per-hour (km/h) scale.
Coolant temperature is indicated in Fahrenheit
(for US).
²Speedometer with outer kilometers-per-hour
(km/h) scale and inner miles-per-hours (mph)
scale. Coolant temperature is indicated in de-
grees Celsius (for Canada).
Below the speedometer, there is a LCD multi-
function indicator in clear view of the driver. Warn-
ing and indicator lights (based on colored light
emitting diodes) are located in the bottom of the
instrument cluster with the exception of the turn
signal indicator lights, ASR warning light and re-
serve fuel warning light. The warning lights for the
seat belt usage and parking brake/brake fluid level
are located in the line above the bottom line. The
indicator that illuminates up when the parking
brake is applied or the brake fluid level is low is
different for U.S. and Canada.
When the key is turned to the 2nd position in the
ignition, the function of the following indicator
lights is checked automatically: High Beam ON,
Preheating, airbag malfunction. In case of a broken
LED of the airbag malfunction light, the seat belt
usage warning light will flash for 6 seconds after
the function check is finished. The Instrument
Cluster is operated with the help of 4 buttons
located below the multifunction indicator. The back-
lighting for the instrument cluster uses yellow
LED's and can be adjusted electronically to daylight
and darkness.The instrument cluster includes a warning
buzzer, which sounds (in addition to a warning light
in some cases) when:
²The headlights are on with the ignition off and
the door opened.
²The driver 's seat belt is not fastened with the
ignition on.
²The key is in the ignition and the door is open.
²Critical ASSYST information is displayed in the
multifunction indicator.
3.5 POWER DOOR LOCKS/RKE
3.5.1 CENTRAL LOCKING
The Central Locking System locks all vehicle
doors if any door is locked from the inside or
mechanically locked with the key from the outside.
However, unlocking any door, in that manner, will
only unlock that particular door. The Master Door
Lock Switch on the dash enables the operator to
lock/unlock all doors. By pressing the top of the
rocker type switch once, all doors will lock. Pressing
the switch again will unlock all doors. Pressing the
lower part of the switch once will lock all doors
except the driver door. Pressing the lower part
again will unlock all doors except the driver door. If
the Central Locking System automatically unlocks
after the vehicle was attempted to be locked, at
least one door is not properly closed.
There are two LED indicators in the Master Door
Lock Switch. The left indicator is for the driver door
and the right indicator is for all passenger/cargo
doors. These will indicate if a door is ajar or if the
doors are locked. The door ajar switches are part of
the door lock motor and are mounted in the door
latch assembly.
Inside each door lock motor there is a command
switch. The command switch is operated by the
plunger and signals any change in the lock status,
locked or unlocked. Each command switch is wired
to the Central Timer Module (CTM) sometimes
referred to as the Central Locking Module. If all
doors are closed and are unlocked, and any door is
locked by the key or the interior handle, thereby
changing the command switch, all doors will be
locked. If one of the door lock motors does not reach
the end position after a locking command, it will be
detected by the CTM (command switch not in
9Locked9position) and the vehicle will be unlocked.
3.5.2 REMOTE KEYLESS ENTRY (RKE)
The SKREEM is a combination of the Remote
Keyless Entry Module and the SKIM (Sentry Key
Immobilizer Module). It is located behind the In-
strument Cluster and has an antenna that goes up
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GENERAL INFORMATION