Inspection Procedure

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

WHEN THIS HAPPENS (SERVICE AREA)
1. Checks if trouble occurs in the service area or outside service area.
  Result:
  
  A: Trouble occurs in the service area.
  
  B: Trouble occurs in the outside service area.
1. B: CHECK AND OPERATE AGAIN (SERVICE AREA)
2. A: Go to next step.
CHECK TELEPHONE TRANSCEIVER ASSY
1. Check that the malfunction disappear when known good transceiver is installed.
  Result:
  
  A: Malfunction does not disappear.
  
  B: Malfunction disappear.
1. B: REPLACE TELEPHONE TRANSCEIVER ASSY (See HOW TO PROCEED WITH TROUBLESHOOTING )
2. A: Go to next step.
CHECK TELEPHONE ANTENNA ASSY
1. Check that the malfunction disappears when known good antenna and telephone antenna cable are installed.
  Result:
  
  A: Malfunction does not disappear.
  
  B: Malfunction disappears.
1. B: REPLACE TELEPHONE ANTENNA ASSY
2. A: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN TELEPHONE TRANSCEIVER ASSY AND TELEPHONE ECU (MAYDAY ECU)) (See HOW TO PROCEED WITH TROUBLESHOOTING )
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: Go to next step.
  REPLACE TELEPHONE ECU ASSY (MAYDAY ECU)