Test C: DTCs C1742 - Rear Sounder Circuit Failure And C1743 - Rear Sounder Circuit Short To VBATT

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

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 variable-rate warning tone is generated by the parking aid speaker. The speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 45.7 cm (18 in) of the vehicle, the warning tone becomes continuous. Voltage is supplied from the parking aid module (PAM) to the parking aid speaker through circuit 1437 (BK/PK). The parking aid speaker is grounded through circuit 676 (PK/OG). The parking aid speaker is part of the high mounted stoplamp.

- DTC C1742 (Rear Sounder Circuit Failure) - is a continuous and on-demand DTC that sets if the PAM detects a short to ground on the parking aid speaker circuit 1437 (BK/PK) when the vehicle is in REVERSE (R).
- DTC C1743 (Rear Sounder Circuit Short to Vbatt) - is a continuous and on-demand DTC that sets if the PAM detects a short to voltage on the parking aid speaker circuit 1437 (BK/PK) when the vehicle is not in REVERSE (R).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Parking aid system inline harness
- Parking aid speaker (part of high mounted stoplamp)
- PAM

C1:

C2-C4:

C5-C6: