Toyota CH-R Service Manual: Taillight Relay Circuit

Toyota CH-R Service Manual / Lighting (ext) / Lighting System / Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1

    Click here

    • *1: w/ Smart Key System

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(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

Taillight Relay

Taillight relay

ON/OFF

-
Body Electrical > Main Body > Active Test

Tester Display

Taillight Relay

OK:

Taillight relay operates. (Taillights illuminate.)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 3K instrument panel junction block assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3K-1 - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

(c) Connect a positive (+) lead from the battery to terminal 3K-1.

(d) Connect a negative (-) lead from the battery to terminal MB-14 (TRLY).

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

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

3H-30 - Battery negative (-) terminal

Always

11 to 14 V
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Hazard Warning Switch Circuit
    DESCRIPTION The combination meter assembly receives the hazard warning signal switch assembly on signal and controls the operation of the hazard warning lights. WIRING DIAGRAM CAUTION / NOTICE ...

    Power Source Circuit
    DESCRIPTION When the ignition switch is ON or the operation conditions of the headlights are met, the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies ...

    Other materials:

    Toyota CH-R Service Manual > Vehicle Stability Control System: Open or Short in Brake Pedal Load Sensing Switch (C1429)
    DESCRIPTION The brake pedal load sensing switch turns on when the brake pedal is depressed with a force exceeding a predetermined level. The skid control ECU uses this circuit to detect if the brake pedal is depressed or not. DTC No. Detection Item DTC Detecti ...

    Toyota CH-R Service Manual > Clock System: Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2024 Copyright www.tochr.net
    0.0118