Inspection Procedure

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

   Transponder key ECU: 

   ITEM MEASUREMENT NORMAL CONDITION CHART
   
   

   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. 

OK: REPLACE TRANSPONDER KEY ECU 

NG: Go to next step 

Fig 1: Inspecting Unlock Warning Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

NG: REPLACE UNLOCK WARNING SWITCH ASSEMBLY 

OK: Go to next step 

1. Disconnect the U1 switch connector.
2. Disconnect the T13 ECU connector.
   Fig 2: Disconnecting T13 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   U1-2 (UN+) - T13-3 (KSW)	Below 1 Ω
   U1-1 (UN-) - Body ground
   U1-2 (UN+) or T13-3 (KSW) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE TRANSPONDER KEY ECU