Dodge Ram Truck 1500-2500-3500. Manual — part 401
FCM-FRONT FOG LAMP 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
MISSING RELAY
FOG LAMP RELAY OUTPUT CIRCUIT OPEN
FRONT CONTROL MODULE
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the DRBIII
T
, clear all FCM DTC’s.
Turn the Front Fog Lamps on.
With the DRBIII
T
, read the DTC information.
Doe the DRBIII
T
read: Front Fog Lamp 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.
MISSING RELAY
Turn the ignition off.
Check the IPM to make certain the Fog Lamp Relay is present.
Is the Fog Lamp Relay present?
Yes
>> Go To 3
No
>> Replace the missing Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
8L - 10
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-FRONT FOG LAMP RELAY OUTPUT CIRCUIT OPEN (CONTINUED)
3.
FOG LAMP RELAY
Turn the ignition off.
Install a known good relay in place of the fog lamp relay.
Turn the Fog Lamps On.
Do the Fog Lamps operate normally?
Yes
>> Replace the Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
4.
FRONT CONTROL MODULE
Turn the ignition off
Remove the Fog Lamp Relay.
Measure the voltage of the Fused B+ circuit of the fog lamp relay.
Is the voltage above 10 volts?
Yes
>> Replace the Front Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the Fog Lamp Relay Output Circuit.
Perform BODY VERIFICATION TEST - VER 1.
DR/DH
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 11
FCM-FRONT LEFT TURN OUTPUT CIRCUIT LOW
8L - 12
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-FRONT LEFT TURN 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 short to ground condition
Possible Causes
LEFT FRONT TURN LAMP DRIVER CIRCUIT SHORT TO GROUND
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the DRBIII
T
, clear all FCM DTC’s.
Turn the Left Front Turn Signal on.
With the DRBIII
T
, read the DTC information.
Does the DRBIII
T
read: Front Left Turn 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.
DR/DH
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 13
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