Dodge Ram Truck 1500-2500-3500. Manual — part 410
FCM-LEFT STOP LAMP 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
LEFT BRAKE LAMP FEED CIRCUIT OPEN
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the DRBIII
T
, clear all FCM DTC’s.
Actuate the Stop Lamps.
With the DRBIII
T
, read the DTC information.
Does the DRBIII
T
read: Left Stop Lamp 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.
8L - 46
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-LEFT STOP LAMP OUTPUT CIRCUIT OPEN (CONTINUED)
2.
LEFT BRAKE LAMP FEED CIRCUIT OPEN
Turn the ignition off.
Disconnect the IPM C3 harness connector
Measure the resistance of the Left Brake Lamp Feed circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Left Brake Lamp Feed circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
FRONT CONTROL MODULE
Turn the ignition off
Disconnect the FCM from the IPM.
Disconnect the IPM C3 harness connector.
Measure the resistance of the Left Brake Lamp Feed circuit.
Is the resistance above 5.0 ohms?
Yes
>> Replace the Power Distribution Center..
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 - 47
FCM-LEFT TRAILER RELAY OUTPUT CIRCUIT HIGH
8L - 48
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-LEFT 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 detects a HIGH condition
Possible Causes
INTEGRATED POWER MODULE
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 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 Trailer Tow 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 - 49
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