Test E: Navigation System Does Not Operate Correctly - The Display Screen Is Inoperative

PINPOINT TEST E: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE DISPLAY SCREEN IS INOPERATIVE

E1-E6:

E6-E7:

E7-E9:

Normal Operation
The audio unit display is controlled by the navigation system module. Video color is provided through circuits 1534 (BK), 1535 (BK), and 1536 (BK). Circuit 1537 (RD) provides the color synchronization and circuit 1538 (YE/RD) is the video signal return.

Possible Causes
- circuit 1534 (BK) open or short
- circuit 1535 (BK) open or short
- circuit 1536 (BK) open or short
- circuit 1537 (RD) open or short
- circuit 1538 (YE/RD) open or short
- navigation system module
- audio unit