2001 CHRYSLER VOYAGER CD changer

The DCHA assembly consists of a:
²combustion air fan assembly
²burner housing
²burner insert
²control unit/heat exchanger
²combustion chamber
²dosing pump
3.10.2.2 COMBUSTION AIR FAN
The combustion air fan assembly includes the:
²combustion air fan
²combustion air fan inlet
²fuel supply inlet
The combustion air fan delivers the air required
for combustion from the combustion air inlet to the
burner insert.
3.10.2.3 BURNER HOUSING
The burner housing includes the:
²coolant inlet
²coolant outlet
²exhaust outlet
The burner housing accommodates the burner
insert and is combined with the control unit/heat
exchanger as an assembly.
3.10.2.4 BURNER INSERT
The burner insert includes the:
²combustion pipe fuel cross section
²glow plug/flame sensor
Inside the burner insert fuel is distributed across
the combustion pipe fuel cross section. Combustion
of the fuel/air mixture takes place within the com-
bustion pipe to heat the exchanger. The glow plug/
flame sensor located in the burner insert ignites the
fuel/air mixture during heater start up. After heater
start up, the glow plug/flame sensor operates in the
flame sensor function. The glow plug/flame sensor
designed as an electrical resistor is located in the
burner insert opposite the flame side.
3.10.2.5 CONTROL UNIT/HEAT
EXCHANGER
The control unit/heat exchanger includes the:
²control unit
²temperature sensor
²overheat protection
²heat exchanger
²connector terminal
The control unit controls and monitors combus-
tion operation. The control unit is ventilated bymeans of a ventilation hose routed from the com-
bustion air collector compartment of the burner.
The heat exchanger transfers the heat generated by
combustion to the coolant circuit. The control unit/
heat exchanger and the burner housing are an
assembly and must not be disassembled.
The temperature sensor senses the coolant tem-
perature in the heat exchanger as an electrical
resistance. This signal is sent to the control unit for
processing.
The overheat protection, controlled by the tem-
perature resistor, protects the heater against undue
operating temperatures. The overheat protection
will switch the heater off if the water temperature
exceeds 105ÉC (221ÉF).
3.10.2.6 DOSING PUMP
The dosing pump is a combined delivery, dosing,
and shut-off system for the fuel supply of the heater.
The dosing pump receives its supply of fuel from the
vehicle's fuel tank.
3.10.3 OPERATION
3.10.3.1 ACTIVATION
When the ignition is in Run, the FCM monitors
the PCI bus for the Cabin Heater Activation re-
quest. The A/C ± Heater Control Module initiates
this request only when all conditions for Cabin
Heater activation are favorable (see below). The
request carries the status bit that the FCM requires
to activate its Cabin Heater Assist Control Output.
This output is a low side driver (coming from FCM
pin 15) which supplies a ground signal to the Cabin
Heater (pin 5). When the Cabin Heater receives this
ground signal input, it interprets this as an activa-
tion signal. The FCM low side driver is also capable
of diagnostic sensing. The driver will sense an open
circuit when the driver is off, and will sense a short
to voltage when the driver is on. The FCM will set
DTCs for both of these types of faults.
The DCHA will activate only when the:
²engine is running.
²coolant temperature is below 66ÉC (151ÉF).
²fuel tank has greater than 1/8 of a tank of fuel.
²Power switch on the A/C ± Heater Control Module
is on.
²Blend Control on the A/C ± Heater Control Mod-
ule is set above 95% reheat.
²Front Control Module (FCM) sees the Cabin
Heater Activation request that is bussed from the
A/C ± Heater Control Module.
When the DCHA starting sequence begins, the
glow plug and the combustion air fan are activated.
After 30 seconds, the fuel dosing pump begins oper-
20
GENERAL INFORMATION

Symptom:
CD CHANGER MECHANICAL FAILURE
When Monitored and Set Condition:
CD CHANGER MECHANICAL FAILURE
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: The code will set if the CD Changer detects a mechanical failure.
POSSIBLE CAUSES
INTERNAL FAILURE
TEST ACTION APPLICABILITY
1 This is an internal CD Changer failure.
View repairAll
Repair
Replace the CD Changer.
Perform BODY VERIFICATION TEST - VER 1.
195
AUDIO

Symptom List:
CD CHANGER PLAY FAILURE
CD CHANGER READ FAILURE
IMPROPER DISK IN CD CHANGER
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be CD CHANGER PLAY FAILURE.
When Monitored and Set Condition:
CD CHANGER PLAY FAILURE
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: If the CD is scratched, dirty, so that the head cannot play the disk, the
code will set.
CD CHANGER READ FAILURE
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: The code will set if a CD that is not formatted as a music CD is installed
in the CD Changer.
IMPROPER DISK IN CD CHANGER
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: The code will set if a CD that is not formatted as a music CD is installed
in the CD Changer.
POSSIBLE CAUSES
CD CHANGER PLAY OR READ FAILURE
TEST ACTION APPLICABILITY
1 Replace the problem CD with a good, clean, unscratched, music CD.
Turn the radio on and select the good CD.
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay CD CHANGER PLAY FAILURE, READ FAILURE, or
IMPROPER DISK IN CD CHANGER?All
Ye s®Replace the CD Changer.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
196
AUDIO

Symptom:
CD CHANGER POWER SUPPLY TOO HIGH
When Monitored and Set Condition:
CD CHANGER POWER SUPPLY TOO HIGH
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: The code will set if the radio detects voltage above 16.0 volts for 5 seconds.
POSSIBLE CAUSES
CD CHANGER POWER SUPPLY TOO HIGH
POWER SUPPLY OF CD CHANGER
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the CD Changer harness connector.
Start the engine.
Measure the voltage of the Ignition Switch Output circuit.
Is the voltage above 16.0 volts?All
Ye s®Repair the charging system as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No®Replace the CD Changer.
Perform BODY VERIFICATION TEST - VER 1.
197
AUDIO

Symptom List:
CD CHANGER TEMPERATURE HIGH
CD CHANGER TEMPERATURE LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be CD CHANGER TEMPERATURE
HIGH.
When Monitored and Set Condition:
CD CHANGER TEMPERATURE HIGH
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: The code will set if the temperature inside the CD Changer is above +65É
C (+145É F).
CD CHANGER TEMPERATURE LOW
When Monitored: Continuously with the ignition and CD Changer turned on.
Set Condition: The code will set if the temperature inside the CD Changer is below -23É
C (-10É F).
POSSIBLE CAUSES
LOW OR HIGH TEMPERATURE FAILURE
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase the audio DTC's.
Start the engine and allow the engine to reach normal operating temperature.
If the vehicle has been in the hot sunlight or extreme cold move the vehicle indoors
and open the doors to allow the inside temperature to stabilize.
The CD Changer will operate between -23É C and 65É C (-10É F and +145É F).
With the DRBIIIt, read DTC's.
Does the DRBIIItdisplay CD CHANGER TEMPERATURE LOW or CD CHANGER
TEMPERATURE HIGH?All
Ye s®Replace the CD Changer.
Perform BODY VERIFICATION TEST - VER 1.
No®Test Complete.
198
AUDIO

Symptom:
NO PCI MESSAGES FROM CD CHANGER
When Monitored and Set Condition:
NO PCI MESSAGES FROM CD CHANGER
When Monitored: With the ignition on and the radio on.
Set Condition:
POSSIBLE CAUSES
CD CHANGER (DIN) CABLE
CD CHANGER PCI BUS CIRCUIT OPEN
IGNITION SWITCH OUTPUT CIRCUIT OPEN
RADIO GROUND CKT OPEN
CD CHANGER
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Radio C4 connector (DIN cable) from the Radio and the CD Changer.
Visually inspect the Radio C4 (DIN) cable for damage.
In the next step check for open wires in the DIN cable.
Measure the resistance of the each DIN cable circuit between the Radio DIN cable
connector and the CD Changer DIN cable connector.
In the next step check for wires shorted to the DIN cable metal connectors.
Measure the resistance between each Radio C4 connector ( DIN cable) circuit and the
Radio Din cable metal connector.
Is the DIN cable circuits shorted together or open?All
Ye s®Replace the CD Changer (DIN) cable.
Perform BODY VERIFICATION TEST - VER 1.
No®Go To 2
362
COMMUNICATION

TEST ACTION APPLICABILITY
2 Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
Select DRB Standalone.
Select lab scope.
Select Live.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again
when complete.
Disconnect the CD Changer harness connector (DIN cable).
Reconnect the Radio C4 (DIN Cable) harness connector.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the CD Changer DIN Cable connector.
Turn the ignition on.
Turn the Radio and CD Changer on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?All
Ye s®Go To 3
No®Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the CD Changer harness connector (DIN cable).
Turn the ignition on.
Turn the Radio and the CD Changer on.
Using a 12-volt test light connected to ground, probe the Ignition Switch Output
circuit in the CD Changer DIN Cable connector.
Is the test light illuminated?All
Ye s®Go To 4
No®Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
4 Turn the ignition off.
Disconnect the CD Changer harness connector (DIN cable).
Using a 12-volt test light connected to 12-volts, probe the CD Changer ground circuit
in the CD Changer connector (DIN cable).
Is the test light illuminated?All
Ye s®Go To 5
No®Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
5 If there are no possible causes remaining, view repair. All
Repair
Replace the CD Changer.
Perform BODY VERIFICATION TEST - VER 1.
363
COMMUNICATION
NO PCI MESSAGES FROM CD CHANGER ÐContinued

CD CHANGER-8WAYCAV CIRCUIT FUNCTION
1 X40 20GY/WT (EXCEPT
BUILT-UP-EXPORT)AUDIO OUT RIGHT
1 X40 24GY/WT (BUILT-UP-
EXPORT)AUDIO OUT RIGHT
2 E14 18OR/TN (EXCEPT
BUILT-UP-EXPORT)PANEL LAMPS DRIVER
2 E14 24OR/TN (BUILT-UP-
EXPORT)PANEL LAMPS DRIVER
3 D25 20WT/VT (EXCEPT
BUILT-UP-EXPORT)PCI BUS
3 D25 24VT/YL (BUILT-UP-
EXPORT)PCI BUS
4 X112 20RD (EXCEPT
BUILT-UP-EXPORT)IGNITION SWITCH OUTPUT
4 X112 24RD (BUILT-UP-
EXPORT)IGNITION SWITCH OUTPUT
5 X41 20DG/WT (EXCEPT
BUILT-UP-EXPORT)AUDIO OUT LEFT
5 X41 24DG/WT (BUILT-UP-
EXPORT)AUDIO OUT LEFT
6 Z140 24BK/OR (BUILT-UP-
EXPORT)GROUND
6 Z140 18BK/OR (EXCEPT
BUILT-UP-EXPORT)GROUND
7 Z141 18BK/TN (EXCEPT
BUILT-UP-EXPORT)GROUND
7 Z141 22BK/TN (BUILT-UP-
EXPORT)GROUND
8 X160 20GY/YL (EXCEPT
BUILT-UP-EXPORT)B(+)
8 X160 22GY/YL (BUILT-UP-
EXPORT)B(+)
CENTER DOME LAMP (BASE/HIGH LINE) - GRAY 3 WAYCAV CIRCUIT FUNCTION
1 M22 20YL/OR COURTESY LAMPS DRIVER
2 Z327 20BK/OR GROUND
3 M27 20YL/LB READING LAMPS DRIVER
CLOCKSPRING C1 - WHITE 6 WAYCAV CIRCUIT FUNCTION
1 X920 20GY/OR RADIO CONTROL MUX RETURN
2 X20 20GY/WT RADIO CONTROL MUX
3 X3 20DG/VT HORN SWITCH SENSE
4 V37 20VT SPEED CONTROL SWITCH SIGNAL
5 Z23 20BK/LB SPEED CONTROL SWITCH GROUND
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1033
CONNECTOR PINOUTS