Toyota 4Runner manuals

Toyota 4Runner: Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives headlight dimmer switch information signals, and illuminates the high beam headlight.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (DAYTIME RUNNING LIGHT)

(a) Using the Techstream, perform the Active Test (See page ).


Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Daytime Running Light

Running light relay

ON/OFF

-

Head Light Hi

Running light relay

ON/OFF

-

OK:

Running light relay operates (high beam headlights illuminate).


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

CHECK HARNESS AND CONNECTOR (BATTERY - RUNNING LIGHT RELAY)

(a) Remove the running light relay from the engine room relay block, junction block.


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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Running light relay terminal 6 (+B) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Running Light Relay)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Remove the running light relay from the engine room relay block, junction block.

(b) Disconnect the 2C and 2D driver side junction block assembly.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

Running light relay terminal 4 (H) - 2D-24

Always

Below 1 Ω

Running light relay terminal 2 (DRLS) - 2C-37

Always

Below 1 Ω

Running light relay terminal 3 (E) - Body ground

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

Running light relay terminal 4 (H) or 2D-24 - Body ground

Always

10 kΩ or higher

Running light relay terminal 2 (DRLS) or 2C-37 - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly (See page ).



(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2D-24 - A-22 (DIM)

Always

Below 1 Ω

2C-37 - A-25 (DRL)

Always

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Driver Side Junction Block Assembly)

-

-


NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY


OK

5.

REPLACE RUNNING LIGHT RELAY

(a) Replace the running light relay.

(b) Check that the daytime running lights operate normally (See page ).


OK:

The daytime running lights operate normally.


OK

END (RUNNING LIGHT RELAY WAS DEFECTIVE)


NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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