Test E: DTC C1742 - Rear Sounder Circuit Failure and C1743 - Rear Sounder Circuit Short To Vbatt

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

E1-E2:

E2-E4:

E4-E6:

E6-E7:

Normal Operation
The system can be disabled by the parking aid switch. A 750 Hz variable warning tone is generated from a parking aid speaker. The parking aid speaker increases the warning tone rate as the vehicle gets closer to an obstacle.

DTC C1742 - is a continuous and on-demand DTC that sets if the parking aid module senses a short to ground or an open on the rear sounder positive circuit 1437 (BK/PK), or rear sounder negative circuit 1438 (DG) when the speaker is off.

DTC C1743 - is a continuous and on-demand DTC that sets if the parking aid module senses a short to voltage on the rear sounder negative circuit 1438 (DG) when the parking aid module is sending a signal to turn on the speaker.

Possible Causes
- Circuit 1437 (BK/PK) open, short to ground or voltage
- Circuit 1438 (DG) open or short to voltage
- Parking aid module
- Parking aid speaker