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.

USE LEXUS HAND-HELD TESTER
1. NO: Go to step 3
2. YES: Go to step 2 .
READ VALUE OF LEXUS HAND-HELD TESTER
1. Check the transponder key ECU by the ECU data monitor.
  Standard:
  
  Transponder key ECU (switch condition)
  
  Fig 1: Transponder Key ECU Switch Condition Table Using Hand-Held Tester
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: GO TO FLOW CHART OR PROBLEM SYMPTOM TABLE (See KEY LOCK-IN PREVENTION FUNCTION DOES NOT WORK PROPERLY (COURTESY LAMP SWITCH CIRCUIT) )
2. NG: Go to step 3 .
INSPECT UNLOCK WARNING SWITCH ASSY
1. Check the key unlock warning switch continuity.
  
  Fig 2: Key Unlock Warning Switch Continuity Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Identifying Unlock Warning Switch Assy. Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE UNLOCK WARNING SWITCH ASSY
2. OK: GO TO FLOW CHART OR PROBLEM SYMPTOM TABLE (See KEY LOCK-IN PREVENTION FUNCTION DOES NOT WORK PROPERLY (COURTESY LAMP SWITCH CIRCUIT) )