Inspection Procedure

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

Check MPX-B and DOOR fuse.
CHECK:

Check continuity of MPX-B and DOOR fuse.

OK

Continuity
1. NG: Replace the failure cause
2. OK: Go to next step.
Check voltage between terminals BECU, BSUB and GND, GND2 of Body ECU connector.
PREPARATION:
1. Turn ignition switch OFF.
2. Disconnect the Body ECU connector.
CHECK:

Measure voltage between terminals BECU, BSUB and GND, GND2.

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 terminal GND, GND2 of Body ECU 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 and battery.