C1709 Buick Code - Right Rear Center Sensor Circuit Failure

Parking Aid Systems consist of the following:
- Four ultrasonic parking aid sensors (located in the rear bumper)
- Parking aid speaker-audible warning tone
- Parking Aid Module (PAM)
- Parking aid switch

The parking aid system detects objects behind the vehicle when the vehicle reverse gear select input to the control module enabled.The PAM does this by calculating the distance to an object by the use of four ultrasonic sensors mounted in the rear bumper. The ultrasonic field is emitted in a semicircular area around the rear of the vehicle. The sensors can detect objects approximately 1.8 m (5.9 ft) to the rear of the vehicle, 50 cm (1.6 ft) to the rear side of the vehicle, and 16 cm (6 in) above ground. A 750 kHz variable warning tone is generated from a speaker located inside the rear RH quarter trim panel. The speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 25 cm (10 in) of the sensors, the warning tone becomes continuous.
The parking aid system is enabled when the vehicle ignition is in RUN and the reverse (R) gear is selected. The parking aid disabled indicator will illuminate for three seconds when the ignition is turned to RUN. The system can be disabled by depressing the parking aid disable switch on the instrument panel. The parking aid system will indicate it is disabled by illuminating the parking aid disabled indicator. The system will always enable when the ignition is turned to RUN, or entry into reverse (R).
The parking aid system will be disabled if a fault is detected in one of the four sensors, the parking aid speaker or the parking aid module. This will be indicated by the parking aid disabled indicator being illuminated.

• Faulty Right Rear Sensor
• Right Rear Sensor harness is open or shorted to ground
• Right Rear Sensor circuit poor electrical connection