Dodge Ram Truck 1500-2500-3500. Manual — part 411
FCM-LEFT TRAILER RELAY OUTPUT CIRCUIT LOW
8L - 50
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-LEFT 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
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: Left Trailer Relay Output
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 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 - 51
FCM-LEFT TRAILER RELAY OUTPUT CIRCUIT OPEN
8L - 52
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-LEFT TRAILER RELAY OUTPUT CIRCUIT OPEN (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 an OPEN condition
Possible Causes
INTEGRATED POWER MODULE
FRONT CONTROL MODULE
TRAILER RELAY OUTPUT CIRCUIT OPEN
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: Left Trailer Relay Output
Circuit Open?
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.
INTEGRATED POWER MODULE
Turn the ignition off.
Check the IPM to make certain the Left Trailer Tow Relay is present.
Is the Trailer Tow Relay present?
Yes
>> Go To 3
No
>> Replace the Integrated Power Module.
Perform BODY VERIFICATION TEST - VER 1.
DR/DH
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 53
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