Dodge Ram Truck 1500-2500-3500. Manual — part 413

FCM-PARK LAMP RELAY OUTPUT CIRCUIT LOW

8L - 58

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-PARK LAMP 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

PARK LAMP RELAY

POWER DISTRIBUTION CENTER

FRONT CONTROL MODULE

1.

INTERMITTENT CONDITION

Turn the ignition on.

With the DRBIII

T

, clear all FCM DTC’s.

Turn the Park Lamps on.

With the DRBIII

T

, read the DTC information.

Does the DRBIII

T

read: Park Lamp 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.

DR/DH

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

8L - 59

FCM-PARK LAMP RELAY OUTPUT CIRCUIT LOW (CONTINUED)

2.

PARK LAMP RELAY

Turn the ignition off.

Install a know good relay in place of the Park Lamp Relay.

Turn the ignition on.

Actuate the Park Lamps.

Do the Park Lamps operate normally?

Yes

>> Go To 3

No

>> Replace the Park Lamp Relay.

Perform BODY VERIFICATION TEST - VER 1.

3.

FRONT CONTROL MODULE

Turn the ignition off

Remove the Park Lamp Relay.

Remove the FCM from the IPM.

Measure the resistance between ground and the Park Lamp 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.

8L - 60

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

FCM-PARK LAMP RELAY OUTPUT CIRCUIT OPEN

DR/DH

LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS

8L - 61