Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus GS 430 and 2004 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Check ECU-B2 and ECU-IG fuse.
CHECK:

Check continuity of ECU-B2 and ECU-IG fuse.

OK:

Continuity
1. NG: Replace the failure fuse.
2. OK: Go to Next Step
Check voltage between terminals BECU, IG and GND of body ECU No. 2 connector.
PREPARATION:

Turn ignition switch ON.

CHECK:

Measure voltage between terminals IG and GND.

OK:

Voltage: 10 - 14V

PREPARATION:
1. Turn ignition switch OFF.
2. Disconnect the body ECU No. 2 connector.
CHECK:

Measure voltage between terminals BECU and GND.

OK:

Voltage: 10 - 14V
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 body ECU No. 2 and body ground.
1. NG: Repair or replace wire harness or connector.
2. OK: Go to next step.
  Check and repair wire harness and connector between body ECU No. 2 and battery.