Inspection Procedure: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Immobilizer / Data List.
5. Read the Data List according to the display on the Techstream.
   IMMOBILIZER (TRANSPONDER KEY ECU ASSEMBLY)
   
   

   Tester Display	Measurement Item/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 the Techstream screen, the item changes between ON and OFF according to the chart above.

NG → See step   2 

OK → See step   5 

1. Remove the unlock warning switch assembly. Refer to REMOVAL .
   Fig 1: Inspecting Unlock Warning Switch Assembly

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

   Standard Resistance

   Tester Connection	Switch Position	Specified Condition
   1 - 2	Switch pushed (Key set)	Below 1 Ω
   1 - 2	Switch free (Key removed)	10 kΩ or higher

NG → See step   6 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Unlock Warning Switch Connector Terminals Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E5-2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the transponder key ECU assembly connector.
   Fig 3: Unlock Warning Switch And Transponder Key ECU Assembly Connector Terminal Identification

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E21-3 (KSW) - E5-1	Always	Below 1 Ω
   E5-1 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5