Inspection Procedure

Check MAP DISC visually.
1. NG: Replace MAP DISC.
2. OK: Go to next step.
Insert MAP DISC without tilt.
1. OK: Normal.
2. NG: Go to next step.
Check navigation ECU.
PREPARATION:

Disconnect the navigation ECU connector.

CHECK:

Check the voltage of terminal +B.

OK:

+B: 10 - 14V

Check the voltage of terminal ACC when the ignition switch is in ACC or ON position.

OK:

ACC: 10 - 14V

Check continuity at terminal GND.

OK:

GND: Continuity
1. NG: Replace or repair wire harness or connector.
2. OK: Replace navigation ECU.