Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Security Horn Circuit

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / Security Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn assembly to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    for HEV Model:

    Click here

    for Gasoline Model:

    Click here

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

PROCEDURE

1.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Security Horn

Security horn Assembly

OFF/ON

-
Body Electrical > Main Body > Active Test

Tester Display

Security Horn

OK:

The security horn assembly sounds and stops correctly when operated through the GTS.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT SECURITY HORN ASSEMBLY

Click here

NG

REPLACE SECURITY HORN ASSEMBLY

OK

3.

INSPECT S-HORN RELAY

(a) Remove the S-HORN relay from the No. 1 engine room relay block.

*1

S-HORN Relay

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Auxiliary battery voltage applied between terminals 1 and 2

Below 1 Ω
NG

REPLACE S-HORN RELAY
OK

4.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU).

Click here

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(b) Disconnect the 8E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8E-4 - MB-24 (SH)

Always

Below 1 Ω
NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - S-HORN RELAY)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S-HORN relay holder terminal 1 - Body ground

Ignition switch off

11 to 14 V

S-HORN relay holder terminal 3 - Body ground

Ignition switch off

11 to 14 V

*1

No. 1 Engine Room Relay Block
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (S-HORN RELAY - SECURITY HORN ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S-HORN relay holder terminal 5 - A16-1

Always

Below 1 Ω

S-HORN relay holder terminal 5 or A16-1 - Other terminals and body ground

Always

10 kΩ or higher

*1

No. 1 Engine Room Relay Block
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (S-HORN RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S-HORN relay holder terminal 2 - 8E-4

Always

Below 1 Ω

S-HORN relay holder terminal 2 or 8E-4 - Other terminals and body ground

Always

10 kΩ or higher

*1

No. 1 Engine Room Relay Block
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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