Diagnostic Test

1) MEASURE THE RESISTANCE OF THE ANTI-THEFT TOW SENSOR SIGNAL CIRCUIT

Fig 1: Measuring Resistance Of Anti-Theft Tow Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the CLP/SSM harness connector.

Disconnect the Anti-Theft Tow Sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Anti-Theft Tow Sensor Signal circuit from the CLP/SSM harness connector to the Anti-Theft Tow Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 2).
No
1. Repair the Anti-Theft Tow Sensor Signal circuit for an open.
2. Perform VTSS VERIFICATION TEST .
2) MEASURE THE VOLTAGE OF THE ANTI-THEFT TOW SENSOR SIGNAL CIRCUIT

Fig 2: Measuring Voltage Of Anti-Theft Tow Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Measure the voltage of the Anti-Theft Tow Sensor Signal circuit at the Anti-Theft Tow Sensor harness connector.

Is voltage present?

Yes
1. Repair the Anti-Theft Tow Sensor Signal circuit for a short to voltage.
2. Perform VTSS VERIFICATION TEST .
No
1. Go to step 3).
3) MEASURE THE RESISTANCE OF THE ANTI-THEFT TOW SENSOR SIGNAL CIRCUIT

Fig 3: Measuring Resistance Of Anti-Theft Tow Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between ground and the Anti-Theft Tow Sensor Signal circuit at the Anti-Theft Tow Sensor harness connector.

Is the resistance below 10K ohms?

Yes
1. Repair the Anti-Theft Tow Sensor Signal circuit for a short to ground.
2. Perform VTSS VERIFICATION TEST .
No
1. Replace the Anti-Theft Tow Sensor. (Refer to ELECTRICAL/VEHICLE THEFT SECURITY/ANTI-THEFT TOW SENSOR - REMOVAL) .
2. Perform VTSS VERIFICATION TEST .