Inspection Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch ON with a key that cannot start the engine.
3. Read the DATA LIST according to the display on the tester.

   Transponder key ECU: 

   TRANSPONDER KEY ECU DATA LIST
   
   

   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 ASSEMBLY 

NG: Go to Next Step. 

Fig 1: Inspecting Unlock Warning Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the unlock warning switch assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

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

NG: REPLACE UNLOCK WARNING SWITCH ASSEMBLY 

OK : Go to Next Step. 

1. Disconnect the U1 switch connector.
   Fig 2: Identifying U1 Unlock Warning Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   U1-1 -Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : Go to Next Step. 

1. Disconnect the T10 ECU and U1 switch connectors.
   Fig 3: Identifying T10 ECU And U1 Switch Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   T10-3(KSW)-U1-2	Always	Below 1 Ω
   U1-2- Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE TRANSPONDER KEY ECU ASSEMBLY