Toyota Tundra Service Manual: Security Indicator Light Does not Blink

DESCRIPTION

The transponder key ECU assembly blinks the security indicator light when the engine immobiliser is set.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly is replaced, refer to Registration.

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PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY INDICATOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Immobiliser / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Immobiliser

Tester Display	Test Part	Control Range	Diagnostic Note
Security Indicator	Security indicator light	ON/OFF	-

OK:

Security indicator light can be turned on and off using the Techstream.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - COMBINATION METER ASSEMBLY (SECURITY INDICATOR LIGHT))

(a) Disconnect the J26 transponder key ECU assembly connector.

(b) Disconnect the J28 combination meter assembly (security indicator light) connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL IND)

(a) Connect the J26 transponder key ECU assembly connector.

(b) Measure the voltage and check for pulses according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
J28-36 (LP) - Body ground	Ignition switch off	Pulse generation
J28-36 (LP) - Body ground	Ignition switch ON	Below 1 V

*a	Front view of wire harness connector (to Combination Meter Assembly (Security Indicator Light))

REPLACE COMBINATION METER ASSEMBLY (SECURITY INDICATOR LIGHT)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

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Toyota Tundra Owners Manual