Diagnostic Test

1) INTERMITTENT CONDITION

Fig 1: Scan Tool - Starscan
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

With the Scan Tool, clear all CCN DTC's.

Turn the Wipers ON then OFF.

With the Scan Tool, read the Wiper DTC's.

Does the Scan Tool read: B2301 - WIPER MODE SWITCH INPUT CIRCUIT LOW?

Yes
1. Go To step 2).
No
1. 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.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) MULTIFUNCTION SWITCH
Turn the ignition off.

Disconnect the Multifunction Switch harness connector.

Ensure the switch is in the OFF position.

Measure the internal resistance of the Multifunction Switch between the G902 and W52 circuits.

Does the Switch measure more than 5.0 ohms?

Yes
1. Replace the Multifunction Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) INSTRUMENT CLUSTER

Fig 2: Checking MUX Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Multifunction Switch connector.

Disconnect the Instrument Cluster C1 harness connector.

Measure the resistance of the (W2) MUX circuit to ground.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (W2) MUX circuit for a short to ground condition.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Instrument Cluster in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .