2006 MERCEDES-BENZ SPRINTER instrument cluster

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
A/C COMPRESSOR CONTROL SHORTED LOW (ACTIVE)....................132
AIR OUTLET TEMP SENSOR HIGH OR OPEN (ACTIVE).....................134
AIR OUTLET TEMP SENSOR SHORTED LOW (ACTIVE).....................136
ATC FUNCTION TEST COOL FAILURE....................................138
ATC FUNCTION TEST FAILURE..........................................138
ATC FUNCTION TEST HEAT FAILURE.....................................138
AUX FAN RELAY CONTROL HIGH OR OPEN (ACTIVE)......................140
AUX FAN RELAY CONTROL SHORTED LOW (ACTIVE)......................142
BLOWER STAGE 1 HIGH OR OPEN (ACTIVE)..............................144
BLOWER STAGE 1 SHORTED LOW (ACTIVE)..............................146
CABIN HEATER CONTROL HIGH OR OPEN (ACTIVE).......................148
CABIN HEATER CONTROL SHORTED LOW (ACTIVE).......................150
CIRC PUMP CONTROL HIGH OR OPEN (ACTIVE)..........................152
CIRC PUMP CONTROL SHORTED LOW (ACTIVE)..........................154
EVAP TEMP SENSOR HIGH OR OPEN (ACTIVE)...........................156
EVAP TEMP SENSOR SHORTED LOW (ACTIVE)...........................158
NO COMMUNICATION BUS (ACTIVE).....................................160
NO COMMUNICATION WITH ECM (ACTIVE)...............................163
NO COMMUNICATION WITH IC (ACTIVE)..................................165
RECIRC AIR SOLENOID CONTROL HIGH OR OPEN (ACTIVE)................167
RECIRC AIR SOLENOID CONTROL SHORTED LOW (ACTIVE)................169
REFRIG PRESS SENSOR HIGH OR OPEN (ACTIVE)........................171
REFRIG PRESS SENSOR SHORTED LOW (ACTIVE)........................173
WATER CYCLE VALVE CONTROL HIGH OR OPEN (ACTIVE).................175
WATER CYCLE VALVE CONTROL SHORTED LOW (ACTIVE).................177
INSTRUMENT CLUSTER
AMBIENT TEMP SENSOR OPEN/SHORT TO BATTERY......................179
AMBIENT TEMP SENSOR SHORT TO GROUND............................181
FUEL LEVEL SENSOR OPEN/SHORT TO BATTERY.........................182
FUEL LEVEL SENSOR SHORT TO GROUND...............................184
INSTRUMENT CLUSTER INTERNAL FAILURE B1043........................185
INSTRUMENT CLUSTER INTERNAL FAILURE B1053........................186
INSTRUMENT CLUSTER OVERVOLTAGE..................................187
NO CAN COMMUNICATION WITH ABS....................................188
NO CAN COMMUNICATION WITH ECM...................................190
NO CAN COMMUNICATION WITH TCM....................................192
PREGLOW INDICATOR LAMP FAILURE...................................194
SRS INDICATOR LAMP FAILURE.........................................195
POWER DOOR LOCKS/RKE
DRIVER DOOR AJAR INDICATOR DRIVER CIRCUIT SHORT TO GROUND......196
PASSENGER DOOR AJAR INDICATOR DRIVER CIRCUIT SHORT TO GROUND .198
REPLACE CONTROL MODULE..........................................200
RKE INTERFACE CIRCUIT SHORT TO GROUND - CTM......................201
RKE INTERFACE CIRCUIT SHORT TO GROUND - SKREEM..................203
RKE INTERFACE CIRCUIT SHORT TO VOLTAGE - CTM.....................205
RKE INTERFACE CIRCUIT SHORT TO VOLTAGE - SKREEM..................206
THE ACM HAS UNLOCKED THE DOORS..................................208
UNKNOWN TROUBLE CODE UNKNOWN DTC TYPE 2......................209
*RKE INOPERATIVE....................................................210
*RKE POOR RANGE...................................................211
iv

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

1.0 INTRODUCTION
The procedures contained in this manual include
all the specifications, instructions and graphics
needed to diagnose Sprinter body system problems.
The diagnostics in this manual are based on the
failure condition or symptom being present at the
time of diagnosis.
Please follow the recommendations below when
choosing your diagnostic path.
1. First make sure the DRBIIItis communicating
with the appropriate modules; i.e., if the
DRBIIItdisplays a ``No Response'' or a ``Bus6
Signals Open'' condition, you must diagnose that
first.
2. Read DTC's (diagnostic trouble codes) with the
DRBIIIt.
3. If no DTC's are present, identify the customer
complaint.
4. Once the DTC or customer complaint is identi-
fied, locate the matching test in the Table of
Contents and begin to diagnose the symptom.
All component location views are in Section 8.0.
All connector pinouts are in Section 9.0. All sche-
matics are in Section 10.0. All Charts and Graphs
are in Section 11.0.
An * placed before the symptom description indi-
cates a customer complaint without a DTC.
When repairs are required, refer to the appropri-
ate service information for the proper removal and
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added: carryover sys-
tems may be enhanced. READ THIS MANUAL
BEFORE TRYING TO DIAGNOSE A VEHICLE
DIAGNOSTIC TROUBLE CODE. It is recom-
mended that you review the entire manual to be-
come familiar with all the new and changed diag-
nostic procedures.
This book reflects many suggested changes from
readers of past issues. After using this book, if you
have any comments or suggestions, please fill out
the form in the back of this book and mail it back to
us.
1.1 SYSTEM COVERAGE
This diagnostic procedures manual covers all
Sprinter vehicles.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the body system is done in six basic
steps:
²verification of complaint
²verification of any related symptoms
²symptom analysis
²problem isolation
²repair of isolated problem
²verification of proper operation
2.0 IDENTIFICATION OF
SYSTEM
The vehicle systems that are part of the ``body''
system are:
²Airbag
²Automatic Temperature Control
²Communication
²Instrument Cluster
²Power Door Locks/RKE
²Vehicle Theft Security System (VTSS)
²Wiper/Rain Sensor
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
The body system on the Sprinter consists of a
combination of modules that communicate with
each other using the CAN Bus (controller area
network). Through the CAN Bus, information about
the operation of vehicle components and circuits is
relayed quickly to the appropriate modules. Since
the CAN bus network is for intermodule communi-
cation only, the DRBIIItutilizes K-Lines to estab-
lish communications with each module. It is impor-
tant to note the CAN bus circuits are by no means
tied to the K-Lines. They are completely separate
from each other. For additional information on the
CAN bus and the K-Lines, refer to the Communi-
cation section of this general information.
3.1 AIRBAG SYSTEM
The Sprinter Airbag System contains the follow-
ing components:
²Airbag Control Module (ACM)
²Airbag Warning Indicator (SRS)
²Driver Airbags
²Clockspring
²Passenger Airbag
²Driver Seat Belt Tensioners
²Passenger Seat Belt Tensioners
The Airbag Control Module (ACM) has five major
functions: onboard diagnostics, determine the se-
verity of impacts, squib deployment and Accident
Response, K-Line communications. The ACM is
1
GENERAL INFORMATION

secured to the floor under the Driver seat and
receives power from the Fuse Block No. 1. When-
ever the ignition key is turned to the run or start
position, the ACM performs a system test. The ACM
cannot be repaired or adjusted.
The microprocessor in the ACM monitors the
internal and external airbag system electrical cir-
cuits to determine the system readiness. When a
monitored system is determine to be out of range,
the ACM will set both active and stored diagnostic
trouble codes (DTC). The ACM also contains an
energy-storage capacitor. This capacitor stores
enough electrical energy to deploy the front airbag
components for two seconds following a battery
disconnect or failure during an impact.
The Accelerometer in the ACM is used to sense
the rate of vehicle deceleration, provide verification
of the direction and severity of an impact. When the
preprogrammed conditions are met, the ACM sends
an electrical signal to deploy the appropriate front
airbag system components and a deployment noti-
fication.
To provide an accident response notification, the
ACM is hardwired to the Central Timer module
(CTM) and Engine Control Module (ECM). When a
deployment occurs the ACM provides a 50ms 10.0
volt pulse to the CTM and ECM. When the Accident
Report notification signal is received the CTM un-
locks the door locks and the ECM stalls the engine.
The Accident signal will set a DTC in the CTM and
the door locks will not work until the DTC has been
erased. The ECM will set a DTC if the Accident
Report circuit is shorted to battery voltage. The
ACM saves the deployment record and after three
deployments the ACM must be replaced. The
DRBIIItcan be used to test the Accident Report
Notification feature: select the SYSTEM TEST from
the ACM main menu. Then select the Analog Crash
Output System Test.
The ACM is hardwired to the Instrument Cluster
(MIC) to control Warning Indicator (SRS indicator).
When DTCs becomes activate, the ACM illuminates
the Warning Indicator by pulling the indicator
circuit low. The SRS indicator is the only point at
which the customer can observe symptoms of a
system malfunction.
As part of the system test the ACM illuminates
the Warning Indicator on for 4.0 second bulb test.
After the lamp check, if the indicator turns off, it
means that the ACM has checked the system and
found it to be free of discernible malfunctions.
NON-CRITICAL DTCs
If the lamp comes on and stays on for a period
longer than 4.0 seconds (about 10.0 seconds) is
usually a stored DTC (intermittent problem) in the
system.
CRITICAL DTCs
DTCs that could lead to a condition where the
safety devises may not deploy or incorrectly deploy.
In the event of such a DTC, the safety of the vehicle
occupants can no longer be guaranteed. If the lamp
remains on, there could be an active DTC in the
system. Some DTCs, Internal Module and squib
DTCs, will keep the indicator illuminated even if
the codes are no longer active.
ACM NOT CONFIGURED FOR PASSENGER
AIRBAG AND TENSIONER
If after replacing the ACM the Airbag Warning
Indicator flashes continuously the ACM must be
configured for the Passenger Airbag and Tensioner.
Select Miscellaneous from the ACM main menu and
configure the Passenger Airbag Tensioner squibs.
WARNING:THE AIRBAG SYSTEM IS A
SENSITIVE, COMPLEX ELECTROMECHANICAL
UNIT. BEFORE ATTEMPTING TO DIAGNOSE OR
SERVICE ANY AIRBAG SYSTEM OR RELATED
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENTS YOU MUST
FIRST DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE (GROUND) CABLE. WAIT
TWO MINUTES FOR THE SYSTEM CAPACITOR
TO DISCHARGE BEFORE FURTHER SYSTEM
SERVICE. THIS IS THE ONLY SURE WAY TO
DISABLE THE AIRBAG SYSTEM. FAILURE TO
DO THIS COULD RESULT IN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
WARNING: TO AVOID PERSONAL INJURY OR
DEATH, NEVER STRIKE OR KICK THE
AIRBAG CONTROL MODULE, AS IT CAN
DAMAGE THE IMPACT SENSOR OR AFFECT
ITS CALIBRATION.
WARNING: IF AN AIRBAG CONTROL
MODULE IS ACCIDENTALLY DROPPED
DURING SERVICE, THE MODULE MUST BE
SCRAPPED AND REPLACED WITH A NEW
UNIT. FAILURE TO TAKE THE PROPER
PRECAUTIONS COULD RESULT IN
ACCIDENTAL AIRBAG DEPLOYMENT AND
PERSONAL INJURY OR DEATH.
3.1.1 DRIVER AIRBAG
The airbag protective trim cover is the most
visible part of the driver side airbag system. The
airbag is mounted directly to the steering wheel.
Located under the trim cover are the airbag cushion
and the airbag cushion supporting components.
2
GENERAL INFORMATION

loads are connected to cables and mounted in a
storage case. The cables can be directly connected to
some airbag system connectors. Jumpers are used
to convert the load tool cable connectors to the other
airbag system connectors. The adapters are con-
nected to the module harness connector to open
shorting clips and protect the connector terminal
during testing. When using the load tool follow all of
the safety procedures in the service information for
disconnecting airbag system components. Inspect
the wiring, connector and terminals for damage or
misalignment. Substitute the airbag load tool in
place of a Driver or Passenger Airbag, seat belt
tensioner, clockspring (use a jumper if needed).
Then follow all of the safety procedures in the
service information for connecting airbag system
components. Read the module active DTCs. If the
module reports NO ACTIVE DTCs the defective
components has been removed from the system and
should be replaced. If the DTC is still active, con-
tinue this process until all components in the circuit
have been tested. Then disconnect the module con-
nector and connect the matching adapter to the
module connector. With all airbags disconnected
and the adapter installed the squib wiring can be
tested for open and shorted conditions.
3.1.6 DIAGNOSTIC TROUBLE CODES
Airbag diagnostic trouble codes consist of active
and stored codes. If more than one code exists,
diagnostic priority should be given to the active
codes. Each diagnostic trouble code is diagnosed by
following a specific testing procedure. The diagnos-
tic test procedures contain step-by-step instructions
for determining the cause of the trouble codes. It is
not necessary to perform all of the tests in this book
to diagnose an individual code. Always begin by
reading the diagnostic trouble codes with the
DRBIIIt. This will direct you to the specific test(s)
that must be performed. In certain test procedures
within this manual, diagnostic trouble codes are
used as a diagnostic tool.
3.1.6.1 ACTIVE CODES
If the lamp remains on, there could be an active
DTC in the system. The code becomes active as soon
as the malfunction is detected or key-on, whichever
occurs first. An active trouble code indicates an
on-going malfunction. This means that the defect is
currently there every time the airbag control mod-
ule checks that circuit or component. Some DTCs,
Internal Module and squib DTCs, will keep the
indicator illuminated even if they are no longer
active. If the lamp is on and no active codes are
present, cycling the ignition switch off and then on
will refresh the lamp state. It is impossible to erase
an active code.
3.1.6.2 STORED CODES
Airbag codes are automatically stored in the
ACM's memory as soon as the malfunction is de-
tected. A stored code indicates there was an active
code present at some time. Stored diagnostic trou-
ble code will remain stored until erased by the DRB.
If a malfunction is not active while performing a
diagnostic test procedure, the active code diagnostic
test will not locate the source of the problem. In this
case, the stored code can indicate an area to inspect.
Maintain a safe distance from all airbags while
performing the following inspection. If no obvious
problems are found, erase stored codes, and with
the ignition on wiggle the wire harness and connec-
tors, rotate the steering wheel from stop to stop.
Recheck for codes periodically as you work through
the system. This procedure may uncover a malfunc-
tion that is difficult to locate.
3.2 COMMUNICATION
3.2.1 COMMUNICATION K-LINES
The K-Lines are a group of circuits that connect
each control module to the Data Link Connector
(DLC). Each control module is connected to the DLC
with a single K-Line. The DRBIIItuses the K-Line
to communicate with each control module. With the
use of the K-Lines the DRBIIItis able to read each
control modules DTCs, sensor displays, I/Os etc. If
DRBIIItcommunications with a particular control
module is lost, one of the possible causes could be a
fault in the module's K-Line.
NOTE: It is important to note the DRBIIIT
uses the K-Lines for diagnostic and
monitoring functions and is no way
connected to the CAN data bus network.
The following modules that use the K-line on this
vehicle are:
²Airbag Control Module (ACM)
²Automatic Temperature Control (ATC)
²Cabin Heater Module (CHM)
²Central Timer Module (CTM)
²Controller Antilock Brake (CAB)
²Engine Control Module (ECM)
²Heater Booster Module (HBM)
²Instrument Cluster (IC)
²Shifter Assembly (SA)
²Security System Module (SSM)
²Sentry Key Remote Entry Module (SKREEM)
²Transmission Control Module (TCM)
4
GENERAL INFORMATION