Dodge Ram Truck 1500-2500-3500. Manual — part 408

FCM-LEFT LOWBEAM OUTPUT CIRCUIT LOW (CONTINUED)

2.

LEFT LOWBEAM OUTPUT CIRCUIT SHORT TO GROUND

Turn the ignition off.

Disconnect the IPM C7 harness connector.

Measure the resistance between ground and the Left Lowbeam Output
circuit.

Is the resistance below 5.0 ohms?

Yes

>> Go To 3

No

>> Repair the Left Lowbeam 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 Lowbeam 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 - 38

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-LEFT LOWBEAM OUTPUT CIRCUIT OPEN

DR/DH

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

8L - 39

FCM-LEFT LOWBEAM 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 LOWBEAM OUTPUT CIRCUIT OPEN

POWER DISTRIBUTION CENTER

FRONT CONTROL MODULE

1.

INTERMITTENT CONDITION

Turn the ignition on.

With the DRBIII

T

, clear all FCM DTC’s.

Turn the Lowbeam Lamps on.

With the DRBIII

T

, read the DTC information.

Does the DRBIII

T

read: Left Lowbeam 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 - 40

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-LEFT LOWBEAM OUTPUT CIRCUIT OPEN (CONTINUED)

2.

LEFT LOWBEAM OUTPUT CIRCUIT OPEN

Turn the ignition off.

Disconnect the IPM C7 harness connector

Measure the resistance of the Left Lowbeam Output circuit.

Is the resistance above 5.0 ohms?

Yes

>> Repair the Left Lowbeam Output 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 C7 harness connector.

Measure the resistance of the Left Lowbeam Output 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 - 41