Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Check the MAP DISC
1. NG : Replace the MAP DISC.
2. OK: Go to next step
Insert a MAP DISC without tilt.
1. OK : Normal.
2. NG : Go To Next Step
Check the navigation ECU.
PREPARATION:

Disconnect the navigation ECU connector.

CHECK:

Check voltage terminal +B.

OK:
1. +B: 10-14V
CHECK:

Check voltage terminal ACC when turning the ignition switch to ACC or ON position.

OK:
1. ACC: 10-14 V
CHECK:

Check continuity terminal GND.

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