Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST USING HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position, and turn the hand-held tester main switch ON.
3. Select the item "SECURITY INDIC" in the ACTIVE TEST, and operate it with the hand-held tester.
4. Check that the security indicator light blinks.
  Standard:
  - The security indicator light blinks.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

NG: Go to next step.
CHECK HARNESS AND CONNECTOR (A/C CONTROL PANEL - TRANSPONDER KEY ECU)
1. Disconnect the T20 ECU and A14 panel connectors.
  
  Fig 1: Disconnecting T20 ECU & A14 Panel Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the wire harness side connectors.
  Standard
  
  Fig 2: Measuring Resistance Of A/C Control Panel & Transponder Key ECU Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
INSPECT TRANSPONDER KEY ECU ASSY
1. Reconnect the T20 ECU connectors.
  
  Fig 3: Reconnecting T20 ECU Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage of the wire harness side connectors.
  Standard
  
  Fig 4: Measuring Voltage Of Transponder Key ECU Assy & Body Ground Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE TRANSPONDER KEY ECU ASSY

OK: REPLACE A/C AMPLIFIER ASSY (See OVERHAUL )