Chrysler Town, Dodge Caravan. Manual — part 852
Symptom List:
NO ABS BUS MESSAGES RECEIVED
NO BCM BUS MESSAGES RECEIVED
NO FCM BUS MESSAGES RECEIVED
NO ORC BUS MESSAGES RECEIVED
NO TCM BUS MESSAGES RECEIVED
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be NO ABS BUS MESSAGES
RECEIVED.
POSSIBLE CAUSES
NO COMMUNICATION WITH THE ABS, BCM, FCM, ORC, OR TCM MODULE
INTERMITTENT CONDITION
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, attempt to communicate with the ABS, BCM, FCM, ORC, or TCM
module.
Was the DRB able to I/D or communicate with the module in question?
All
Yes
→ Go To 2
No
→ Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2
With the DRB, erase DTC’s.
Turn the ignition on and wait approximately 1 minute.
With the DRB, read DTC’s.
Did this DTC reset?
All
Yes
→ Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ The condition is not present at this time. Monitor DRBIIIt
parameters while wiggling the related wire harness. Refer to any
Technical Service Bulletins (TSB) that may apply. Visually in-
spect the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.
644
INSTRUMENT CLUSTER
Symptom:
NO PCM BUS MESSAGES RECEIVED
POSSIBLE CAUSES
PCM MESSAGE NOT RECEIVED
NO COMMUNICATION WITH THE PCM
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, enter Instrument Cluster, System Tests then PCM Monitor.
Does the DRBIII
t display: PCM is active on the BUS?
All
Yes
→ Erase the DTC, if DTC resets, replace the Instrument Cluster in
accordance with the Service Information..
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the PCM.
Was the DRBIII
t able to communicate with the PCM?
All
Yes
→ Go To 3
No
→ Refer to the Communication category and perform the appropri-
ate symptom.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the PCM C2 harness connector.
Connect the diagnostic junction port tester #8339 to the diagnostic junction port.
NOTE: Do not connect the tester to the DRBIII
t.
Measure the resistance of the PCI Bus circuit between the diagnostic junction port
tester and the PCM C2 connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
645
INSTRUMENT CLUSTER
Symptom:
PANEL DIMMING OUTPUT SHORT
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
EMIC DIMMING CIRCUIT SHORT TO GROUND
HEADLAMP SWITCH DIMMING CIRCUIT SHORT TO GROUND
HVAC MODULE DIMMING CIRCUIT SHORT TO GROUND
I/P MULTI-FUNCTION SWITCH DIMMING CIRCUIT SHORT TO GROUND
MIRROR SWITCH DIMMING CIRCUIT SHORT TO GROUND
RADIO DIMMING CIRCUIT SHORT TO GROUND
REAR BLOWER CONTROL SWITCH DIMMING CIRCUIT SHORT TO GROUND
EMIC
HEADLAMP SWITCH
I/P MULTI-FUNCTION SWITCH
MIRROR SWITCH
RADIO
REAR BLOWER CONTROL SWITCH
BODY CONTROL MODULE
HVAC MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, record and erase Body Control Module DTC’s.
Turn the ignition off, wait 15 seconds, then turn the ignition on.
Turn on the Headlamps.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PANEL DIMMING OUTPUT SHORT?
All
Yes
→ Go To 2
No
→ Go To 17
2
Turn the ignition on.
With the DRBIII
t, erase Body Control Module DTCs.
Turn the ignition off to the lock position.
Disconnect the EMIC harness connector.
Turn the ignition on.
Turn the Headlamps on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PANEL DIMMING OUTPUT SHORT?
All
Yes
→ Go To 3
No
→ Replace the EMIC in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
646
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
3
Turn the ignition on.
With the DRBIII
t, erase Body Control Module DTCs.
Turn the ignition off to the lock position.
Disconnect the Headlamp Switch harness connector.
Turn the ignition on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PANEL DIMMING OUTPUT SHORT?
All
Yes
→ Go To 4
No
→ Replace the Headlamp Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition on.
With the DRBIII
t, erase Body Control Module DTCs.
Turn the ignition off to the lock position.
Disconnect the I/P Multi-Function Switch harness connector.
Turn the ignition on.
Turn the Headlamps on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PANEL DIMMING OUTPUT SHORT?
All
Yes
→ Go To 5
No
→ Replace the I/P Multi-Function Switch in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition on.
With the DRBIII
t, erase Body Control Module DTCs.
Turn the ignition off to the lock position.
Disconnect the Mirror Switch harness connector.
Turn the ignition on.
Turn the Headlamps on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PANEL DIMMING OUTPUT SHORT?
All
Yes
→ Go To 6
No
→ Replace the Mirror Switch in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition on.
With the DRBIII
t, erase Body Control Module DTCs.
Turn the ignition off to the lock position.
Disconnect the Rear Blower Control Switch harness connector.
Turn the ignition on.
Turn the Headlamps on.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display PANEL DIMMING OUTPUT SHORT?
All
Yes
→ Go To 7
No
→ Replace the Rear Blower Control Switch in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
647
INSTRUMENT CLUSTER
PANEL DIMMING OUTPUT SHORT —
Continued
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