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.

    Click here

    *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
B

GO TO HORN SYSTEM

A

2.

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 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

3F-27 - MB-28 (HORN)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Engine Hood Courtesy Switch Circuit
    DESCRIPTION The hood courtesy switch is built into the hood lock assembly. This switch turns on when the hood is closed and turns off when the hood is opened. WIRING DIAGRAM CAUTION / NOTICE / ...

    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 h ...

    Other materials:

    Toyota CH-R Service Manual > Blind Spot Monitor System: Short to GND in Outer Mirror Indicator(Master) (C1AB2)
    DESCRIPTION This DTC is stored when the blind spot monitor sensor LH (Master) detects a short to ground in the outer rear view mirror indicator LH. DTC No. Detection Item DTC Detection Condition Trouble Area C1AB2 Short to G ...

    Toyota CH-R Service Manual > Navigation System: Noise Occurs or Sound Skips when Portable Player Plays
    CAUTION / NOTICE / HINT HINT: Perform this check with the portable player volume set at an appropriate level. Make sure that there are no obstructions between the portable player and the radio and display receiver assembly that may block signals, and that the portable playe ...

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2022 Copyright www.tochr.net
    0.0145