2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

PROBLEM SYMPTOMS (POWER SHOULDER BELT ANCHORAGE SYSTEM)

Symptom Suspected Area See
Driver side:
Seat belt anchor does not operate
  1. D B/ANC fuse
  2. D DOOR fuse
  3. D-IG1 relay
  4. Height adjustable anchor switch (driver side)
  5. Height adjustable anchor motor (driver side)
  6. Wire harness
POWER SHOULDER BELT ANCHORAGE SYSTEMΒ 
POWER SHOULDER BELT ANCHORAGE SYSTEMΒ 
POWER SHOULDER BELT ANCHORAGE SYSTEMΒ 
INSPECTIONΒ 
INSPECTIONΒ 
-
Passenger side:
Seat belt anchor does not operate
  1. P B/ANC fuse
  2. P DOOR fuse
  3. D-IG1 relay
  4. Height adjustable anchor switch (passenger side)
  5. Height adjustable anchor motor (passenger side)
  6. Wire harness
POWER SHOULDER BELT ANCHORAGE SYSTEMΒ 
POWER SHOULDER BELT ANCHORAGE SYSTEMΒ 
POWER SHOULDER BELT ANCHORAGE SYSTEMΒ 
INSPECTIONΒ 
INSPECTIONΒ 
-

HINT:

The power shoulder belt anchorage system is part of the large-scale multiplex communication system. This system features shared communication wiring that reduces the wiring complexity of the communication lines. The first step in any repair is to confirm the proper operation of the communication system. Proceed with troubleshooting after the communication has been verified (see the Multiplex Communication System).

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.