Diagnostic Test

1) REAR SPOILER LIMIT SWITCH SIGNAL (DOWN) CIRCUIT SHORT TO B(+)

Fig 1: Checking Switch Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the BCM harness connector.

Disconnect the Rear Spoiler Limit Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage of the Rear Spoiler Limit Switch Signal (Down) circuit at the Rear Spoiler Limit Switch harness connector.

Is voltage above 1.0 volts?

Yes
1. Repair the Rear Spoiler Limit Switch Signal (Down) circuit for a short to B(+).
2. Perform REAR SPOILER VERIFICATION TEST .
No
1. Go to step 2).
2) OPEN REAR SPOILER LIMIT SWITCH SIGNAL (DOWN) CIRCUIT

Fig 2: Checking Switch Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance of the Rear Spoiler Limit Switch Signal (Down) circuit from the BCM C4 harness connector to the Rear Spoiler Limit Switch harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 3).
No
1. Repair the Rear Spoiler Limit Switch Signal (Down) circuit for an open.
2. Perform REAR SPOILER VERIFICATION TEST .
3) OPEN REAR SPOILER LIMIT SWITCH GROUND CIRCUIT

Fig 3: Checking Switch Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance between ground and the Rear Spoiler Limit Switch Ground circuit at the Rear Spoiler Limit Switch harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Body Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/BODY CONTROL/CENTRAL TIMER MODULE - REMOVAL) .
2. Perform REAR SPOILER VERIFICATION TEST .
No
1. Repair the Rear Spoiler Limit Switch Ground circuit for an open.
2. Perform REAR SPOILER VERIFICATION TEST .