Toyota Tundra. Manual — part 2479

Fig. 23: Identifying Turn Signal Flasher And Main Body ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

TURN SIGNAL FLASHER - MAIN BODY ECU

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

2. CHECK MAIN BODY ECU

a. Disconnect the J3 ECU connector.

Tester Connection

Condition Specified Condition

J29-S (DRL) - J3-8 (DRL)

Always

Below 1 ohms

J29-5 (DRL) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Fig. 24: Identifying Main Body ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard voltage

MAIN BODY ECU

NG: REPLACE MAIN BODY ECU

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

HEADLIGHT (HI-BEAM) CIRCUIT

DESCRIPTION

The main body ECU receives light control switch and dimmer switch information signals from the headlight
dimmer switch, and illuminates the headlight high beam.

WIRING DIAGRAM

Tester Connection

Switch Condition Specified Condition

J3-8 (DRL) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch OFF

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Fig. 25: Identifying Headlight (Hi-Beam) - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST BY TECHSTREAM (HEADLIGHT)

a. Operate the Techstream according to the steps on the display and select "Active Test".

Techstream

Main Body

MAIN BODY - TECHSTREAM ACTIVE TEST CHART

OK: Headlight (High) turns on / off.

NG: Go to step 2

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

2. INSPECT FUSE (HEAD LH, HEAD RH)

a. Remove the HEAD LH and HEAD RH fuse from the engine room junction block.

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

Standard resistance

Tester Display

Test Part

Control Range Diagnostic Note

Head Light (Hi) Headlight (High)

ON or OFF

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

FUSE (HEAD LH, HEAD RH)

NG: REPLACE FUSE

OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (HEADLIGHT HIGH BULB - BATTERY)

a. for LH:

1. Disconnect the A8 headlight connector.

Fig. 26: Identifying Headlight Connector Terminals - LH
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard voltage

HEADLIGHT HIGH BULB - BATTERY LH

b. for RH:

1. Disconnect the A9 headlight connector.

Tester Connection Condition Specified Condition

HEAD LH fuse

Always

Below 1 ohms

HEAD RH fuse

Tester

Connection

Switch Condition

Specified

Condition

A8-2 - Body

ground

Light control switch HEAD, dimmer switch High

11 to 14 V

Light control switch HEAD, dimmer switch except

High

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra