Normal Operation

The Parking Aid Module (PAM) supplies a reference voltage and signal return to the parking aid sensors. Each of the parking aid sensors has an individual input signal to the PAM. When an object is present behind the vehicle, the PAM receives an input signal from the sensors and determines the distance of the object to the vehicle. A fault condition occurs when the PAM detects a short to ground or signal return circuit on the parking aid sensor voltage circuit.

• DTC B1299 (Power Supply Sensor Circuit Short to Ground) - sets when the sensor power supply circuit is shorted to ground or to the signal return circuit.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Parking aid sensor(s)
• Parking aid bumper harness
• PAM