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 the 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
Antenna Coil Status	Antenna coil condition/NORMAL or FAIL	NORMAL: Antenna coil is normal FAIL: Antenna coil is malfunctioning	-

OK: "NORMAL" (antenna coil is normal) appears on the screen.

NG: Go to step 2

OK: REPLACE TRANSPONDER KEY ECU ASSEMBLY

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

Disconnect the D23 transponder key ECU connector.

Fig 1: Identifying Transponder Key ECU And Transponder Key Amplifier Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the D24 transponder key amplifier connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D23-14 (VC5) - D24-1 (VC5)	Below 1 Ω
D23-15 (CODE) - D24-4 (CODE)	Below 1 Ω
D23-4 (TXCT) - D24-5 (TXCT)	Below 1 Ω
D23-5 (AGND) - D24-7 (AGND)	Below 1 Ω
D23-14 (VC5) or D24-1 (VC5) - Body ground	10 kΩ or higher
D23-15 (CODE) or D24-4 (CODE) - Body ground	10 kΩ or higher
D23-4 (TXCT) or D24-5 (TXCT) - Body ground	10 kΩ or higher
D23-5 (AGND) or D24-7 (AGND) - Body ground	10 kΩ or higher

Reconnect the D23 transponder key ECU connector.
Reconnect the D24 transponder key amplifier connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE TRANSPONDER KEY AMPLIFIER