Diagnostic Test

1) OPEN REAR SPOILER DRIVER (DOWN) CIRCUIT

Fig 1: Checking Driver Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the BCM C4 harness connector.

Disconnect the Rear Spoiler Motor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Rear Spoiler Driver (Down) circuit from the BCM C4 harness connector to the Rear Spoiler Motor harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 2).
No
1. Repair the Rear Spoiler Driver (Down) circuit for an open.
2. Perform REAR SPOILER VERIFICATION TEST .
2) REAR SPOILER DRIVER (DOWN) CIRCUIT SHORT TO B(+)

Fig 2: Checking Driver Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Measure the voltage of the Rear Spoiler Driver (Down) circuit at the Rear Spoiler Motor harness connector.

Is the voltage above 1.0 volt?

Yes
1. Repair the Rear Spoiler Driver (Down) circuit for a short to B(+).
2. Perform REAR SPOILER VERIFICATION TEST .
No
1. Go to step 3).
3) REAR SPOILER DRIVER (DOWN) CIRCUIT SHORT TO GROUND

Fig 3: Checking Driver Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between ground and the Rear Spoiler Driver (Down) circuit at the Rear Spoiler Motor harness connector.

Is the resistance below 100k ohms?

Yes
1. Repair the Rear Spoiler Driver (Down) circuit for a short to ground.
2. Perform REAR SPOILER VERIFICATION TEST .
No
1. Replace the Body Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/BODY CONTROL/CENTRAL TIMER MODULE - REMOVAL) .
2. Perform REAR SPOILER VERIFICATION TEST .