Chrysler Pacifica. Manual — part 92
Symptom:
TCM MESSAGES NOT RECEIVED
When Monitored and Set Condition:
TCM MESSAGES NOT RECEIVED
When Monitored:
With the ignition in unlock.
Set Condition:
The module does not receive any messages from the TCM. Time to mature
for the BCM, DDM, IPM and PDM is 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE TCM
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 module which set the DTC in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
365
COMMUNICATION
Symptom:
*NO RESPONSE FROM AMPLIFIER
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE RADIO
GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
FUSED ACCESSORY RELAY OUTPUT CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
AMPLIFIER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: The Radio must be turned on for the DRB to get a response from the
Amplifier.
With the DRB, attempt to communicate with the Radio.
Was the DRB able to I/D or communicate with the Radio?
All
Yes
→ Go To 2
No
→ Refer to the symptom list for problems related to no communica-
tion with the Radio.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Amplifier C2 harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for both circuits?
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 Amplifier C1 harness connector.
Using a 12-volt test light connected to ground, probe both Fused B(+) circuits.
Is the test light illuminated for both circuits?
All
Yes
→ Go To 4
No
→ Check IPM fuse #49 for an open. If OK, repair the Fused B+
circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
366
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Amplifier C2 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Accessory Relay
Output circuit.
Is the test light illuminated?
All
Yes
→ Go To 5
No
→ Check IPM fuse #25 for an open. If OK, repair the Fused
Accessory Relay Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
5
Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Amplifier C2 harness connector.
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. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Amplifier connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Replace the Amplifier in accordance 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.
367
COMMUNICATION
*NO RESPONSE FROM AMPLIFIER —
Continued
Symptom:
*NO RESPONSE FROM ANTILOCK BRAKE MODULE
POSSIBLE CAUSES
NO RESPONSE FROM ABS
GROUND CIRCUIT OPEN
OPEN FUSED RUN RELAY OUTPUT CIRCUIT/FUSED B(+) (VALVE) CIRCUIT
OPEN PCI BUS CIRCUIT
ANTILOCK BRAKE BRAKE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Note: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, attempt to communicate with the Occupant Restraint Controller.
With the DRB, attempt to communicate with the Body Control Module (BCM).
Was the DRB able to I/D or establish communications with either of the modules?
All
Yes
→ Go To 2
No
→ Refer to the Communications category and perform the symptom
PCI Bus Communication Failure.
Perform ABS VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Antilock Brake Module harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for each circuit?
All
Yes
→ Go To 3
No
→ Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Antilock Brake Module harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Run Relay Output
circuit and the Fused B(+) (Valve) circuit.
Is the test light illuminated?
All
Yes
→ Go To 4
No
→ Repair the Fused Run Relay Output circuit or Fused B(+) (Valve)
circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
368
COMMUNICATION
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