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-E3:

E3-E4:

E4-E6:

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

Possible Causes
- circuit 1534 (BK/RD) open, short to ground, or short to voltage
- circuit 1535 (BK/LG) open, short to ground, or short to voltage
- circuit 1536 (BK/LB) open, short to ground, or short to voltage
- circuit 1537 (RD) open, short to ground, or short to voltage
- circuit 1538 (YE/RD) open, short to ground, or short to voltage
- audio unit
- navigation module