Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

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 - 14 V

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

OK:

ACC: 10 - 14 V

Check continuity at terminal GND.

OK:

GND: Continuity
1. NG : Replace or repair wire harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Replace navigation ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).