Chrysler Town, Dodge Caravan. Manual — part 773
Symptom:
ATC MODULE MESSAGES NOT RECEIVED
When Monitored and Set Condition:
ATC MODULE 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 Automatic Temperature
Control (ATC) module for at least 0.125 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE AUTOMATIC TEMPERATURE CONTROL MODULE
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, enter Body then Automatic Temp Control.
Was the DRB able to I/D or communicate with the ATC?
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.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, 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.
328
COMMUNICATION
Symptom:
AUDIO MESSAGES NOT RECEIVED
When Monitored and Set Condition:
AUDIO 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 radio for at least 5
seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE RADIO
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
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 Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2
With the DRB, erase DTC’s.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, 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.
329
COMMUNICATION
Symptom List:
BCM, PCI BUS SHORTED TO BATTERY
BCM, PCI BUS SHORTED TO GROUND
FCM, PCI BUS SHORTED TO BATTERY
FCM, PCI BUS SHORTED TO GROUND
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be BCM, PCI BUS SHORTED TO
BATTERY.
When Monitored and Set Condition:
BCM, PCI BUS SHORTED TO BATTERY
When Monitored:
Continuously
Set Condition:
Anytime the BCM detects a short to battery on the PCI Bus circuit.
BCM, PCI BUS SHORTED TO GROUND
When Monitored:
Continuously
Set Condition:
Anytime the BCM detects a short to ground on the PCI Bus circuit.
FCM, PCI BUS SHORTED TO BATTERY
When Monitored:
Continuously
Set Condition:
Anytime the FCM detects a short to battery on the PCI Bus circuit.
FCM, PCI BUS SHORTED TO GROUND
When Monitored:
Continuously
Set Condition:
Anytime the FCM detects a short to ground on the PCI Bus circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
330
COMMUNICATION
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/ECM).
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.
331
COMMUNICATION
BCM, PCI BUS SHORTED TO BATTERY —
Continued
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