Chrysler Pacifica. Manual — part 79
Symptom:
NO J1850 COMMUNICATION - SDARS
POSSIBLE CAUSES
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
NOTE: For this code to be active, the DRB will not be able to communicate
with any modules on the vehicle (except the PCM).
NOTE: Clear the code. If this code continues to set and the DRB can still
communicate with the module, it will be necessary to replace the module.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, wiggle the wiring
harnesses. This is to try and duplicate the complete bus failure condition.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→ Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
313
AUDIO
Symptom:
NO PCI TRANSMISSION
When Monitored and Set Condition:
NO PCI TRANSMISSION
When Monitored:
With the ignition on.
Set Condition:
The module fails a phase 1 recovery in 8 consecutive attempts.
POSSIBLE CAUSES
NO PCI TRANSMISSION
RADIO-NO PCI TRANSMISSION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Turn the Radio on.
With the DRBIII
t, erase the audio DTC’s.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIII
t, read the audio DTC’s.
Did this DTC reset?
All
Yes
→ Replace the Radio.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Refer to the wiring diagrams located in the service information to
help isolate a possible short.
Perform BODY VERIFICATION TEST - VER 1.
314
AUDIO
Symptom List:
PCI BUS SHORTED TO BATTERY - AMPLIFIER
PCI BUS SHORTED TO GROUND - AMPLIFIER
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be PCI BUS SHORTED TO BAT-
TERY - AMPLIFIER.
When Monitored and Set Condition:
PCI BUS SHORTED TO BATTERY - AMPLIFIER
When Monitored:
With the ignition on.
Set Condition:
Anytime the module detects a short to battery on the PCI Bus circuit.
PCI BUS SHORTED TO GROUND - AMPLIFIER
When Monitored:
With the ignition on.
Set Condition:
Anytime the module detects a short to ground on the PCI Bus circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
NOTE: For this code to be active, the DRB will not be able to communicate
with any modules on the vehicle (except the PCM).
NOTE: Clear the code. If this code continues to set and the DRB can still
communicate with the module, it will be necessary to replace the module.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, wiggle the wiring
harnesses. This is to try and duplicate the complete bus failure condition.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→ Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
315
AUDIO
Symptom:
PCM MESSAGES NOT RECEIVED - AMPLIFIER
When Monitored and Set Condition:
PCM MESSAGES NOT RECEIVED - AMPLIFIER
When Monitored:
With the ignition in run.
Set Condition:
The module does not receive any messages from the PCM.
POSSIBLE CAUSES
PCM MESSAGES NOT RECEIVED
ATTEMPT TO COMMUNICATE 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 active on the BUS?
All
Yes
→ Erase the DTC, if DTC resets, replace the Amplifier 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 appropriate
symptom.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the PCI Bus circuit between the DLC and the PCM
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.
316
AUDIO
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