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 MPX-IG fuse and D-IG1 relay.
CHECK:
1. Check continuity of MPX-IG fuse.
2. Check D-IG1 relay.
OK:

Continuity
1. NG : Replace the failure fuse or relay.
2. OK : Go to next step.
Check voltage between terminals FMIG and E of front light ECU connector.
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure voltage between terminals FMIG and E.

OK:

Voltage: 10 - 14 V
1. OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG : Go to next step.
Check wire harness and connector between ECU and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace wire harness or connector
2. OK : Check and repair wire harness and connector between ECU and battery (See PROBLEM SYMPTOMS TABLE ).