Diagnostic Test

1) TEST THE WIPER MOTOR

Fig 1: Testing Wiper Motor
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Body Control Module (BCM) C2 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Connect a jumper wire between cavity 1 of the BCM C2 harness connector and B(+).

Connect a jumper wire between cavity 41 of the BCM C2 harness connector and ground.

With the jumper wires connected, does the Wiper Motor move?

Yes
1. Go to step 2).
No
1. Replace the Wiper Motor. (Refer to ELECTRICAL/WIPERS/WASHERS/FRONT WIPER MOTOR - REMOVAL)
2. Perform BODY VERIFICATION TEST .
2) MEASURE WIPER SWITCH MUX CIRCUIT VOLTAGE

Fig 2: Checking Wiper Switch MUX Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Body Control Module (BCM) harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage of the Wiper Switch Mux circuit at the BCM C3 connector cavity 65 with the Wiper Switch in the High position.

Is the voltage approximately 12 volts?

Yes
1. Replace the Body Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/BODY CONTROL/CENTRAL TIMER MODUL - REMOVAL)
2. Perform BODY VERIFICATION TEST .
No
1. Go to step 3).
3) MEASURE WIPER/WASHER FUSED B(+) CIRCUIT VOLTAGE

Fig 3: Measuring Wiper/Washer Fused B(+) Circuit Voltage
Courtesy of DAIMLERCHRYSLER CORP.

NOTE: Inspect Fuse 32 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing.

Turn the ignition off.

Disconnect the Multi-Function Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage of the Fused B(+) circuit at the Multi-Function Switch harness connector.

Is the voltage above 10 volts?

Yes
1. Go to step 4).
No
1. Repair the Fused B(+) circuit for an open.
2. Perform BODY VERIFICATION TEST .
4) MEASURE WIPER SWITCH RESISTANCE

Fig 4: Measuring Wiper Switch Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the Wiper Switch from the Multi-Function Switch connector with the wiper switch in intermittent, then low, then high positions.

Are the resistance readings below 1K ohms?

Yes
1. Repair the Wiper Switch Mux circuit for an open.
2. Perform BODY VERIFICATION TEST .
No
1. Replace the Multi-Function Switch. (Refer to ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/MULTI-FUNCTION SWITCH - REMOVAL)
2. Perform BODY VERIFICATION TEST .