Test I: Navigation System Does Not Operate Correctly - The Audio Unit Is Inoperative

PINPOINT TEST I: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE AUDIO UNIT IS INOPERATIVE

I1-I3:

I3-I5:

I5-I7:

Normal Operation
The navigation module communicates with the audio unit through circuits 1532 (DB/WH) and 1533 (DG/OG) using the controller area network (CAN) protocol. Battery voltage is supplied to the audio unit through circuit 1772 (VT), and circuit 1499 (PK/LG) provides voltage to the audio unit with the key in the ON or ACC position. The audio unit ground is supplied through circuits 694 (BK/LG).

Possible Causes
- fuse(s)
- circuit 694 (BK/LG) open
- circuit 1499 (PK/LG) open
- circuit 1532 (DB/WH) open, short to ground, or short to voltage
- circuit 1533 (DG/OG) open, short to ground, or short to voltage
- circuit 1772 (VT) open
- audio unit
- navigation module