Inspection Procedure

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the hand-held tester.

Read Value Of Hand-Held Tester (Transponder Key ECU (Switch Condition)
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON with the key with which the engine does not start.
3. Select the item "KEY SW" on the hand-held tester.
  OK: Normal
  
  NG: Fail
1. OK : Replace Transponder Key ECU Assy
2. NG : Go to Next Step
Inspect Unlock Warning Switch Assy
1. Remove the unlock warning switch.
2. Inspect the unlock warning switch continuity.
  
  Fig 1: Inspecting Unlock Warning Switch Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Terminals 1 & 2 Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Go to Next Step
2. NG : Replace Unlock Warning Switch Assy
Check Wire Harness (Transponder Key ECU Assy >--< Unlock Warning Switch)
1. Disconnect the T8 ECU and K3 unlock warning switch connectors.
2. Check the continuity between the wire harness side connectors.
  
  Fig 3: Checking Terminals T8 & K3 Wire Harnesses
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 4: Terminals T8 & K3 Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Replace Transponder Key ECU Assy
2. NG : Repair Or Replace Harness And Connector