Rear Spoiler Limit Switch Failure

REAR SPOILER LIMIT SWITCH FAILURE

Rear Spoiler Limit Switch Failure:

WHEN MONITORED
Continuous.

SET CONDITION
The Body Control Module (BCM) sense both Rear Spoiler Limit Switches shorted to ground at the same time.

POSSIBLE CAUSES
- Spoiler limit switch signal (up) circuit shorted to ground
- Spoiler limit switch signal (down) circuit shorted to ground
- Rear spoiler limit switch
- Body control module

DIAGNOSTIC TEST

1. SPOILER LIMIT SWITCH SIGNAL (UP) CIRCUIT




Turn the ignition off.
Disconnect the Rear Spoiler Limit Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Spoiler Limit Switch Signal (Up) circuit at the Spoiler Limit Switch harness connector.

Q: Is the voltage above 10.0 volts?

YES: Go to 2
NO: Go to 4

2. SPOILER LIMIT SWITCH SIGNAL (DOWN) CIRCUIT




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

Q: Is the voltage above 10.0 volts?

YES: Replace the Rear Spoiler Limit Switch. Perform REAR SPOILER VERIFICATION TEST. Rear Spoiler Verification Test
NO: Go to 3

3. SPOILER LIMIT SWITCH SIGNAL (DOWN) CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Disconnect the BCM C4 harness connector.
Measure the resistance between ground and the Spoiler Limit Switch (Down) circuit.

Q: Is the resistance below 100k ohms?

YES: Repair the Spoiler Limit Switch Signal (Down) circuit for a short to ground. Perform REAR SPOILER VERIFICATION TEST. Rear Spoiler Verification Test
NO: Replace the Body Control Module. Perform REAR SPOILER VERIFICATION TEST. Rear Spoiler Verification Test

4. SPOILER LIMIT SWITCH SIGNAL (UP) CIRCUIT SHORT TO GROUND




Turn the ignition off.
Disconnect the BCM C4 harness connector.
Measure the resistance between ground and the Spoiler Limit Switch (Up) circuit.

Q: Is the resistance below 100k ohms?

YES: Repair the Spoiler Limit Switch Signal (Up) circuit for a short to ground. Perform REAR SPOILER VERIFICATION TEST. Rear Spoiler Verification Test
NO: Replace the Body Control Module. Perform REAR SPOILER VERIFICATION TEST. Rear Spoiler Verification Test