Test C: DTC C1742 - Rear Sounder Circuit Failure and DTC C1743 - Rear Sounder Circuit Short to Vbatt

PINPOINT TEST C: DTC C1742 - REAR SOUNDER CIRCUIT FAILURE AND DTC C1743 - REAR SOUNDER CIRCUIT SHORT TO VBATT

C1-C2:

C2-C4:

C5-C6:

Normal Operation
With the ignition switch in the RUN position and the gear selector in REVERSE (R), the parking aid system calculates the distance to an object by the use of a radar sensor. A 750 Hz variable warning tone is generated by the parking aid sounder.

The parking aid speaker tone is controlled by the parking aid module through circuit CLS03 (GN/WH). Circuit GD149 (BK/GY) provides ground. The parking aid sounder is located in the LH C-pillar area.

DTC C1742 - is a continuous and on-demand DTC that sets if the parking aid module detects a short to ground or open on the rear speaker circuit CLS03 (GN/WH) when the vehicle is in REVERSE (R) and a detectable object is within the azimuth field.

DTC C1743 - is a continuous and on-demand DTC that sets if the parking aid module detects a short to voltage on the rear speaker circuit CLS03 (GN/WH) when the vehicle is in REVERSE (R) and a detectable object is within the azimuth field.

Possible Causes
- Circuit CLS03 (GN/WH) open, short to voltage or ground
- Circuit GD149 (BK/GY) open
- Parking aid speaker
- Parking aid module