Chrysler Town, Dodge Caravan. Manual — part 781
Symptom:
TCM MESSAGES NOT RECEIVED
When Monitored and Set Condition:
TCM MESSAGES NOT RECEIVED
When Monitored:
With the ignition in run, and the IOD fuse installed.
Set Condition:
The BCM does not receive any messages from the Transmission Control
Module (TCM) for at least 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE TCM
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the Transmission Control Module.
Was the DRBIII
t able to I/D or communicate with the TCM?
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 DRBIII
t, erase DTC’s.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRBIII
t, read DTC’s.
Did this DTC reset?
All
Yes
→ Replace the Body Control Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
360
COMMUNICATION
Symptom:
*NO RESPONSE FROM AIRBAG CONTROL MODULE
POSSIBLE CAUSES
CHECKING FOR VOLTAGE
GROUND CIRCUIT OPEN
PCI BUS CIRCUIT OPEN
AIRBAG CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: Check the FCM for DTC’s. If DTC’s are present, go to the appropriate
category and perform the DTC.
Ensure that the battery is fully charged.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Airbag Control Module harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector
Turn the ignition on and then reconnect the Battery.
Using a 12-volt test light connected to ground, probe the ORC Run Only Driver
Circuit and the ORC Run/Start Driver Circuit at the Airbag Control Module
connector.
NOTE: One open circuit will not cause a NO RESPONSE condition.
Is the test light illuminated on both circuits?
All
Yes
→ Go To 2
No
→ Repair the ORC Run Only Driver and the ORC Run/Start Driver
circuits for an open.
Perform AIRBAG VERIFICATION TEST - VER 1.
NOTE: When reconnecting airbag system components, the ignition must be
turned off and the battery must be disconnected.
2
Ensure that the battery is fully charged.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Airbag Control Module harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
NOTE: Make sure test light is connected to the Battery positive terminal.
Is the test light illuminated?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit for an open.
Perform AIRBAG VERIFICATION TEST - VER 1.
When reconnecting Airbag system components, the ignition must be turned
off and the battery must be disconnected.
361
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
Note: Ensure there is PCI bus communication with other modules. If not,
refer to the PCI Bus Communication Failure symptom and repair as
necessary.
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the Airbag Control Module harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Turn the ignition on and then reconnect the Battery.
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.
With the DRBIII
t select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Airbag Control Module connector.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Go To 4
No
→ Repair the PCI Bus circuit for an open.
Perform AIRBAG VERIFICATION TEST - VER 1.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Airbag Control Module in accordance with the Service
information. WARNING: Make sure the battery is disconnected
and wait 2 minutes before proceeding.
Perform AIRBAG VERIFICATION TEST - VER 1.
362
COMMUNICATION
*NO RESPONSE FROM AIRBAG CONTROL MODULE —
Continued
Symptom:
*NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL
MODULE
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE BCM
GROUND CIRCUIT OPEN
FUSED (B+) CKT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
AUTOMATIC TEMPERATURE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, enter Body then Body Computer.
Was the DRB able to I/D or communicate with the BCM?
All
Yes
→ Go To 2
No
→ Refer to the symptom list for problems related to no communica-
tion with the BCM.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Using a 12-volt test light connected to 12-volts, probe the Ground circuit.
Is the test light illuminated?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit.
Is the test light illuminated?
All
Yes
→ Go To 4
No
→ Repair the Fused B+ circuit for an open or short. Refer to the
wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
All
Yes
→ Go To 5
No
→ Repair the Fused Ignition Switch circuit for an open or short.
Refer to the wiring diagrams in the service information.
Perform BODY VERIFICATION TEST - VER 1.
363
COMMUNICATION
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