Toyota Tundra Service Manual: Security Indicator Light Circuit

DESCRIPTION

When the theft deterrent system is in the disarmed state, the security indicator light will blink if the immobiliser system is set, or not illuminate if the immobiliser system is not set.

When the theft deterrent system is in the armed state, the security indicator light blinks.

When the theft deterrent system is in the arming preparation state or alarm sounding state, the security indicator light illuminates.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before performing the inspection, check "Security Indicator Light Does not Blink" in ENGINE IMMOBILISER SYSTEM.

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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.

(c) Turn the Techstream on.

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

(e) According to the display on the Techstream, perform the Active Test.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Control Range

Diagnostic Note

Security Indicator

Security indicator light

ON or OFF

-

OK:

The theft warning siren assembly sounds and stops correctly when operated through the Techstream.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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2.

CHECK HARNESS AND CONNECTOR (THEFT WARNING INDICATOR LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J28-36 (LP) - J165-15 (IND)

Always

Below 1 Ω

J28-36 (LP) or J165-15 (IND) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Security Horn Circuit

    System Description

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