Toyota CH-R Service Manual: Front Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the front fog lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses and bulbs 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.

CHECK OPERATION (TAILLIGHTS)

(a) Check the operation of the taillights.

OK:

Taillights operate normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

2.

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

Front Fog Light Relay

Front fog lights

ON/OFF

Light control switch in tail position

Body Electrical > Main Body > Active Test

Tester Display

Front Fog Light Relay

OK:

Front fog lights come on.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

3.

CHECK HARNESS AND CONNECTOR (FR FOG RELAY - BATTERY)

(a) Remove the FR FOG 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

Relay terminal 5 -Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (FR FOG RELAY INPUT VOLTAGE)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Relay terminal 2 - Body ground

Light control switch TAIL or HEAD

11 to 14 V

NG

GO TO STEP 9

OK

5.

INSPECT FR FOG RELAY

(a) Inspect the FR FOG relay.

Click here

NG

REPLACE FR FOG RELAY

OK

6.

CHECK HARNESS AND CONNECTOR (FR FOG RELAY - FOG LIGHT ASSEMBLY RH AND FOG LIGHT ASSEMBLY LH)

(a) Disconnect the A36 fog light assembly LH connector.

(b) Disconnect the A35 fog light assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 3 - A36-2 (B)

Always

Below 1 Ω

Relay terminal 3 - A35-2 (B)

Always

Below 1 Ω

Relay terminal 3 or A36-2 (B) - Body ground

Always

10 kΩ or higher

Relay terminal 3 or A35-2 (B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 1 - 3A-52

Always

Below 1 Ω

Relay terminal 1 or 3A-52 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

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

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

3A-52 - MB-7 (FFGO)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

9.

CHECK HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 2 - 3D-11

Always

Below 1 Ω

Relay terminal 2 or 3D-11 - Body ground

Always

10 kΩ or higher

OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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