Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

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
OK: REPLACE TRANSPONDER KEY ECU ASSY

NG: GO TO NEXT STEP.

INSPECT UNLOCK WARNING SWITCH ASSY

Remove the unlock warning switch.

Inspect the unlock warning switch continuity.

Standard:

TERMINAL SPECIFIED CONDITION TABLE

Terminal No.	Condition	Specified Condition
1 <==> 2	Switch pushed (Key removed)	Continuity
1 <==> 2	Switch free (Key set)	No continuity

NG: REPLACE UNLOCK WARNING SWITCH ASSY

Fig 1: Inspecting Unlock Warning Switch Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP.

CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY <==> UNLOCK WARNING SWITCH)

Disconnect the T8 ECU and K3 unlock warning switch connectors.

Check the continuity between the wire harness side connectors.

Standard:

SYMBOLS SPECIFIED CONDITION TABLE

Symbols (Terminal No.)	Specified Condition
KSW (T8-10) <==> - (K3-2)	Continuity

Fig 2: Identifying T8 ECU & K3 Unlock Warning Switch Connectors

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE TRANSPONDER KEY ECU ASSY