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:

E5-E6:

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

Possible Causes
- circuit 1534 (BK) open, short to ground, or short to voltage
- circuit 1535 (BK) open, short to ground, or short to voltage
- circuit 1536 (BK) 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