Inspection Procedure
WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Service check mode. (Check the navigation ECU)
- NG : Troubleshoot for each diagnosis.
- OK : Replace multi display.
- Ncon
- Check the navigation ECU.
PREPARATION:
Disconnect the navigation ECU connector.
CHECK:
Check voltage terminals +B.
OK:
- +B: 10-14 V
CHECK:
Check voltage terminal ACC when turn ignition switch ACC or ON position.
OK:
- ACC: 10-14 V
CHECK:
Check continuity terminal GND1.
OK:
- GND1: Continuity
- NG : Replace or repair wire harness or connector.
- OK : Go to next step
- Check the navigation ECU.
CHECK:
Check terminal R, G and B.
OK:
- R, G, B: See " NAVIGATION ECU " of " TERMINALS OF ECU ".
- NG : Replace the navigation ECU.
- OK : Go to next step
- R, G, B: See " NAVIGATION ECU " of " TERMINALS OF ECU ".
- Check the multi display.
PREPARATION:
Disconnect the multi display connector.
CHECK:
Check voltage terminals +B.
OK:
- +B: 10-14 V
CHECK:
Check voltage terminal ACC when turn ignition switch ACC or ON position.
OK:
- ACC: 10-14 V
CHECK:
Check continuity terminal GND1.
OK:
- GND1: Continuity
- NG : Replace or repair wire harness or connector.
- OK : Go to next step
- Check the multi display.
CHECK:
Check terminal R, G and B.
OK:
- R, G, B: See " MULTI DISPLAY " of " TERMINALS OF ECU ".
- NG : Replace or repair wire harness or connector.
- OK : Replace multi display.
- R, G, B: See " MULTI DISPLAY " of " TERMINALS OF ECU ".