Toyota Tundra Service Manual: DRL Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

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

Click here

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Daytime Running Light

No. 1 daytime running relay (DRL)

OFF or ON

-

OK:

No. 1 daytime running relay (DRL) operates (daytime running lights turn on).

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT NO. 1 DAYTIME RUNNING LIGHT RELAY (DRL)

(a) Remove the No. 1 daytime running light relay (DRL) from the engine room relay block and junction block.

(b) Inspect the No. 1 daytime running light relay (DRL).

Click here

NG

REPLACE NO. 1 DAYTIME RUNNING LIGHT RELAY (DRL)

OK

3.

CHECK HARNESS AND CONNECTOR (NO. 1 DAYTIME RUNNING LIGHT RELAY [DRL] - BATTERY)

(a) Remove the No. 1 daytime running light relay (DRL) from the engine room relay block and junction block.

*a

Front view of wire harness connector

(to No. 1 Daytime Running Light Relay [DRL])

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

No. 1 daytime running light relay (DRL) terminal 1 - Body ground

Always

11 to 14 V

No. 1 daytime running light relay (DRL) terminal 3 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (NO. 1 DAYTIME RUNNING LIGHT RELAY [DRL] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND HEADLIGHT ASSEMBLY)

(a) Remove the No. 1 daytime running light relay (DRL) from the engine room relay block and junction block.

(b) Disconnect the 3H driver side junction block assembly connector.

(c) for LED Headlight:

(1) Disconnect the A59 headlight assembly LH connector.

(2) Disconnect the A58 headlight assembly RH connector.

(d) for Halogen Headlight:

(1) Disconnect the A10 headlight assembly LH connector.

(2) Disconnect the A11 headlight assembly RH connector.

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

Standard Resistance:

for LED Headlight

Tester Connection

Condition

Specified Condition

No. 1 daytime running light relay (DRL) terminal 2 - 3H-28

Always

Below 1 Ω

No. 1 daytime running light relay (DRL) terminal 5 - A59-5 (B)

Always

Below 1 Ω

No. 1 daytime running light relay (DRL) terminal 2 or 3H-28 - Body ground

Always

10 kΩ or higher

No. 1 daytime running light relay (DRL) terminal 5 or A59-5 (B) - Body ground

Always

10 kΩ or higher

for Halogen Headlight

Tester Connection

Condition

Specified Condition

No. 1 daytime running light relay (DRL) terminal 2 - 3H-28

Always

Below 1 Ω

No. 1 daytime running light relay (DRL) terminal 5 - A10-1 (B)

Always

Below 1 Ω

No. 1 daytime running light relay (DRL) terminal 2 or 3H-28 - Body ground

Always

10 kΩ or higher

No. 1 daytime running light relay (DRL) terminal 5 or A10-1 (B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly.

Click here

*a

Component without harness connected

(Driver Side Junction Block Assembly)

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

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3H-28 - A-25 (DRL)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

    Door Unlock Detection Switch Circuit

    Dtc Check / Clear

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