Test B: The Navigation System Does Not Operate Correctly - No Reverse Tracking

PINPOINT TEST B: THE NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - NO REVERSE TRACKING

B1-B3:

Normal Operation
The audio unit receives a voltage signal from the smart junction box (SJB) to indicate the vehicle is in reverse on circuit 140 (BK/PK).

Possible Causes
- circuit 140 (BK/PK) open or short to ground
- audio unit