Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM

Connect a Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Body Electrical / Immobilizer / Data List.

According to the display on tester, read the "Data List".

Immobilizer:

DATA LIST

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

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

Remove the unlock warning switch assembly.

Fig 1: Identifying Unlock Warning Switch Assembly Operation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the switch.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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

Reinstall the unlock warning switch assembly.

NG: REPLACE UNLOCK WARNING SWITCH ASSEMBLY

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - BODY GROUND)

Disconnect the D19 Unlock warning switch assembly connector.

Fig 2: Identifying Unlock Warning Switch Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D19-2 - Body ground	Below 1 Ω

Reconnect the D19 unlock warning switch assembly connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - UNLOCK WARNING SWITCH ASSEMBLY)

Disconnect the D23 transponder key ECU connector.
Disconnect the D19 unlock warning switch assembly connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D23-3 (KSW) - D19-1	Below 1 Ω

Fig 3: Identifying Transponder Key ECU And Unlock Warning Switch Assembly Connector Terminals

Reconnect the D23 transponder key ECU connector.
Reconnect the D19 unlock warning switch assembly connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE TRANSPONDER KEY ECU ASSEMBLY