Dodge Ram Truck 1500-2500-3500. Manual — part 406
FCM-LEFT HIGHBEAM OUTPUT CIRCUIT LOW
8L - 30
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-LEFT HIGHBEAM 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 HIGHBEAM OUTPUT 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 High Beams Lamps on.
With the DRBIII
T
, read the DTC information.
Does the DRBIII
T
read: Left Highbeam 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 - 31
FCM-LEFT HIGHBEAM OUTPUT CIRCUIT LOW (CONTINUED)
2.
LEFT HIGHBEAM OUTPUT CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the IPM C7 harness connector.
Measure the resistance between ground and the Left Highbeam Out-
put circuit.
Is the resistance below 5.0 ohms?
Yes
>> Go To 3
No
>> Repair the Left Highbeam Output circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
3.
FRONT CONTROL MODULE
Turn the ignition off
Disconnect the FCM connector.
Disconnect the IPM C7 harness connector.
Measure the resistance between ground and the Left Highbeam Output 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.
8L - 32
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DR/DH
FCM-LEFT HIGHBEAM OUTPUT CIRCUIT OPEN
DR/DH
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 33
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