Dodge Ram Truck 1500-2500-3500. Manual — part 422
FCM-RIGHT TRAILER RELAY OUTPUT CIRCUIT HIGH
8L - 94
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-RIGHT TRAILER RELAY OUTPUT CIRCUIT HIGH (CONTINUED)
For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on
•
Set Condition:
The FCM detectsa high condition
Possible Causes
FRONT CONTROL MODULE
INTEGRATED POWER MODULE
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the DRBIII
T
, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the DRBIII
T
, read the DTC information.
Does the DRBIII
T
read: Right Trailer Relay Out-
put Circuit High?
Yes
>> Go To 2
No
>> The condition that caused the symptom is
currently not present. Inspect the related
wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or
partially broken wires.
Perform BODY VERIFICATION TEST -
VER 1.
2.
FRONT CONTROL MODULE
Turn the ignition off.
Remove the Front Control Module from the IPM.
Measure the voltage of the Accessory Relay Control circuit and ground.
Is the voltage above 1.0 volts?
Yes
>> Replace the Integrated Power Module.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
DR/DH
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 95
FCM-RIGHT TRAILER RELAY OUTPUT CIRCUIT LOW
8L - 96
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-RIGHT TRAILER RELAY OUTPUT CIRCUIT LOW (CONTINUED)
For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on
•
Set Condition:
The FCM detects a low condition
Possible Causes
POWER DISTRIBUTION CENTER (PDC)
FRONT CONTROL MODULE
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the DRBIII
T
, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the DRBIII
T
, read the DTC information.
Does the DRBIII
T
read: Right Trailer Relay Out-
put Circuit Low?
Yes
>> Go To 2
No
>> The condition that caused the symptom is
currently not present. Inspect the related
wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or
partially broken wires.
Perform BODY VERIFICATION TEST -
VER 1.
2.
FRONT CONTROL MODULE
Turn the ignition off
Remove the FCM from the IPM.
Measure the resistance between ground and the Right Trailer Tow Relay control circuit in the IPM.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Power Distribution Center(PDC).
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
DR/DH
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 97
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