Dodge Ram Truck 1500-2500-3500. Manual — part 448

MIC-COURTESY LAMP OUTPUT CIRCUIT SHORTED OR OPEN

8L - 198

LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

MIC-COURTESY LAMP OUTPUT CIRCUIT SHORTED OR OPEN (CONTINUED)

For the Interior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - INTERIOR - SCHE-
MATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Continuously

•

Set Condition:
When the CCN detects a short condition

Possible Causes

HEADLAMP SWITCH

COURTESY LAMP OUTPUT CIRCUIT SHORT TO GROUND

INSTRUMENT CLUSTER

1.

INTERMITTENT CONDITION

Turn the ignition on.

With the DRBIII

T

, clear all MIC DTC’s.

Turn the Dome Lamps on.

With the DRBIII

T

, read the DTC information.

Does the DRBIII

T

read: Courtesy/Dome Lamp

Output Circuit Short/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.

HEADLAMP SWITCH

Disconnect the Headlamp Switch connector.

Turn the ignition on.

Does the DRBIII

T

display Headlamp Switch 5.0 volts?

Yes

>> Replace the Headlamp Switch.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Go to 3

DR/DH

LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS

8L - 199

MIC-COURTESY LAMP OUTPUT CIRCUIT SHORTED OR OPEN (CONTINUED)

3.

COURTESY LAMP OUTPUT CIRCUIT SHORT TO GROUND

Turn the ignition off.

Disconnect the Headlamp Switch connector.

Disconnect the Instrument Cluster C1 connector.

Measure the resistance of the Courtesy Lamp Output circuit to ground.

Is the resistance below 5.0 ohms?

Yes

>> Repair the Courtesy Lamp Output circuit for a short to

ground.

Perform BODY VERIFICATION TEST - VER 1.

No

>> Replace the Instrument Cluster in accordance with the ser-

vice information.

Perform BODY VERIFICATION TEST - VER 1.

8L - 200

LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS

DR/DH

MIC-GLOVEBOX-MAP LAMP OUTPUT CIRCUIT SHORTED OR OPEN

DR/DH

LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS

8L - 201