Inspection Procedure

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

INSPECT FUSE (MPX-IG, AM1, D DOOR, MPX-B1)
1. Remove the MPX-IG and AM1 fuses from the driver side J/B.
2. Remove the D DOOR and MPX-B1 fuses from the passenger side J/B.
3. Measure the resistance.
  Standard: Below 1 Ω
1. NG: REPLACE FUSE
2. OK: Go to next step.
INSPECT RELAY (D-IG1)
1. Remove the D-IG1 relay from the driver side J/B.
2. Measure the resistance.
  Standard:
  
  Fig 1: D-IG1 Relay Terminals - Specified Condition
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Identifying Terminals Of D-IG1 Relay
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE RELAY
2. OK: Go to next step.
CHECK WIRE HARNESS (DRIVER DOOR ECU - BODY GROUND)
1. Disconnect the D25 ECU connector.
2. Measure the voltage and resistance of the wire harness side connectors.
  Standard:
  
  Fig 3: Driver Door ECU - Body Ground Terminals - Specified Condition
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying Terminals Of Driver Door ECU - Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. OK: Go to next step.
  PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )