Diagnostic Test

1) CHECK FOR AN ACTIVE DTC
Turn the ignition on.

With the scan tool, record and erase DTCs.

Activate the Panel Dimmer Switch.

Wait 30 seconds.

With the scan tool, read DTCs.

Is the DTC active?

Yes
1. Go To step 2).
No
1. The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
2) CHECK OPERATION OF HEADLAMP SWITCH

Fig 1: Disconnecting Headlamp Switch Harness Connector
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Headlamp Switch harness connector.

With the scan tool, read Instrument Cluster DTCs.

Does the scan tool display-B160B-PANEL DIMMER INPUT CIRCUIT HIGH?

Yes
1. Replace the Headlamp Switch. Refer to SWITCH-HEADLAMP .
2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
No
1. Go To step 3).
3) CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Panel Lamps Dimmer Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Instrument Cluster C1 harness connector.

Measure the resistance between ground and the (E2) Panel Lamps Dimmer Signal Circuit.

Is the resistance below 10K ohms?

Yes
1. Repair the (E2) Panel Lamps Dimmer Signal Circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
No
1. Replace and program the Instrument Cluster. Refer to INSTRUMENT CLUSTER - SERVICE INFORMATION .
2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .