Toyota 4Runner manuals

Toyota 4Runner: Security Horn Circuit

DESCRIPTION

When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the security horn assembly to sound

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN)

(a) Operate the Techstream according to the steps on the display and select Active Test (See page ).


Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Security Horn

Security horn

ON/OFF

-

OK:

Security horn operates normally.


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

INSPECT S-HORN RELAY

(a) Remove the S-HORN relay from the engine room relay block.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Battery voltage is not applied to terminals 1 and 2

10 kΩ or higher

3 - 5

Battery voltage is applied to terminals 1 and 2

Below 1 Ω


NG

REPLACE S-HORN RELAY


OK

3.

INSPECT SECURITY HORN ASSEMBLY

(a) Remove the security horn (See page ).


(b) Apply battery voltage to the horn connector and check the operation of the horn.

OK:

Measurement Condition

Specified Condition

Battery positive (+) → Terminal 1

Battery negative (-) → Horn bracket

Horn sounds


NG

REPLACE SECURITY HORN ASSEMBLY


OK

4.

CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - MAIN BODY ECU, SECURITY HORN AND BATTERY)

(a) Remove the S-HORN relay from the engine room relay block.

(b) Remove the main body ECU (See page ).


(c) Disconnect the A32 horn connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay block S-HORN relay terminal 1 - A-17 (SH)

Always

Below 1 Ω

Relay block S-HORN relay terminal 3 - A32-1

Always

Below 1 Ω

A-17 (SH) - Body ground

Always

10 kΩ or higher

A32-1 - Body ground

Always

10 kΩ or higher

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

Relay block S-HORN relay terminal 2 - Body ground

Always

11 to 14 V

Relay block S-HORN relay terminal 5 - Body ground

Always

11 to 14 V


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Horn Circuit
DESCRIPTION When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the horn(s) to sound. WIRING DIAGRAM ...

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