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 system module communicates to the audio unit through circuits 3125 (RD/YE) and 3126 (TN/YE) using the controller area network (CAN) protocol. Battery voltage is supplied to the audio unit through circuit 1001 (WH/YE). Circuit 1002 (BK/PK) provides voltage to the audio unit with the key in the ON or ACC position. The audio unit ground is supplied through circuits 1203 (BK/LB) and 1204 (BK/OG).

Possible Causes
- circuit 3125 (RD/YE) open or short
- circuit 3126 (TN/YE) open or short
- circuit 1001 (WH/YE) open or short to ground
- circuit 1002 (BK/PK) open or short to ground
- circuit 1203 (BK/LB) open
- circuit 1204 (BK/OG) open
- navigation system module
- audio unit