Toyota CH-R Service Manual: 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*1.

    Click here

    *1: w/ Smart Key System

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

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN)

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

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 Techstream.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT SECURITY HORN ASSEMBLY

(a) Remove the security horn assembly.

Click here

(b) Inspect the 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. 4 relay block assembly.

(b) Inspect the S-HORN relay.

Click here

NG

REPLACE S-HORN RELAY

OK

4.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

Click here

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(b) Disconnect the 3A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3A-20 - MB-29 (SH)

Always

Below 1 Ω

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK

5.

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

(a) Remove the S-HORN relay from the No. 4 relay block assembly.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

No. 4 relay block assembly S-HORN relay terminal 1 - Body ground

Always

11 to 14 V

No. 4 relay block assembly S-HORN relay terminal 5 - Body ground

Always

11 to 14 V

*1

No. 4 Relay Block Assembly

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

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

(a) Remove the S-HORN relay from the No. 4 relay block assembly.

(b) Disconnect the A15 security horn assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

No. 4 relay block assembly S-HORN relay terminal 3 - A15-1

Always

Below 1 Ω

No. 4 relay block assembly S-HORN relay terminal 3 or A15-1 - Body ground

Always

10 kΩ or higher

*1

No. 4 Relay Block Assembly

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK HARNESS AND CONNECTOR (S-HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Remove the S-HORN relay from the No. 4 relay block assembly.

(b) Disconnect the 3A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

No. 4 relay block assembly S-HORN relay terminal 2 - 3A-20

Always

Below 1 Ω

No. 4 relay block assembly S-HORN relay terminal 2 or 3A-20 - Body ground

Always

10 kΩ or higher

*1

No. 4 Relay Block Assembly

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 switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horns to s ...

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