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.

CHECK WHERE THIS HAPPENS
1. Check if malfunction occurs in the service area or outside the service area.
  1. If malfunction occurs in the service area, proceed to A.
  2. If malfunction occurs outside the service area, proceed to B.
B: CHECK AND OPERATE AGAIN (IN SERVICE AREA)

A: Go to next step
CHECK WIRE HARNESS (TELEPHONE TRANSCEIVER ASSY - TELEPHONE ECU ASSY)
1. Disconnect the A ECU and G transceiver connectors.
2. Measure the resistance between the wire harness side connectors.
  Standard:
  
  Fig 1: Tester Specification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Disconnecting A ECU And G Transceiver Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step.
CHECK ANTENNA SYSTEM
1. If the malfunction disappears, proceed to B.
B: REPLACE TELEPHONE TRANSCEIVER ASSY (See MAYDAY SYSTEM )

A: Go to next step

REPLACE TELEPHONE ECU ASSY (See MAYDAY SYSTEM )