Inspection Procedure

1. Check the DATA LIST for proper functioning of the unlock warning switch.

   Transponder key ECU: 

   DATA LIST TRANSPONDER KEY ECU
   
   

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   KEY SW	Unlock warning switch signal/ON or OFF	ON: Key is in ignition key cylinder OFF: No key is in ignition key cylinder	-

   OK: ON (key is in ignition key cylinder) appears on the screen. 

NG: Go to step 2 

OK: REPLACE TRANSPONDER KEY ECU ASSY 

1. Remove the switch.
2. Measure the resistance of the switch.

   Standard: 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Pushed	Below 1 Ω
   1 - 2	Not pushed	10 kΩ or higher

   Fig 1: Identifying Unlock Warning Switch Assy Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE UNLOCK WARNING SWITCH ASSY 

OK: GO TO NEXT STEP 

1. Disconnect the U1 switch connector.
2. Disconnect the T13 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard: 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   U1-2 - T13-3 (KSW)	Below 1 Ω
   U1-1 - Body ground	Below 1 Ω

   Fig 2: Identifying U1 Transponder Key Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE TRANSPONDER KEY ECU ASSY