Toyota CH-R Service Manual: Horn Circuit

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Theft Deterrent System / 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 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.
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*1: w/ Smart Key System
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	INSPECT HORNS

(a) Press the horn switch and check if the horns sound.

Result	Proceed to
Horns sound	A
Horns do not sound	B

GO TO HORN SYSTEM

2.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

Click here

Component without harness connected

(Instrument Panel Junction Block Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3F-27 - MB-28 (HORN)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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