Toyota Tundra. Manual — part 2488

Fig. 59: 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 LOW BULB - BATTERY LH

b. for RH:

1. Disconnect the A11 headlight connector.

Fig. 60: Identifying Headlight Connector Terminals - RH
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 LOW BULB - BATTERY RH

Tester Connection

Switch Condition

Specified

Condition

A10-2 - Body

ground

Light control switch HEAD, dimmer switch Low

11 to 14 V

Light control switch HEAD, dimmer switch except

Low

Below 1 V

Tester Connection

Switch Condition

Specified

Condition

A11-2 - Body

ground

Light control switch HEAD, dimmer switch Low

11 to 14 V

Light control switch HEAD, dimmer switch except

Low

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

NG: Go to step 4

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT LOW BULB - BODY
GROUND)

4. INSPECT HEADLIGHT RELAY (HEAD)

a. Remove the headlight relay from the engine room relay block.

Fig. 61: Identifying Headlight Relay (Head) Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

HEADLIGHT RELAY (HEAD)

NG: REPLACE HEADLIGHT RELAY

OK: Go to next step

5. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - BATTERY)

a. Remove the headlight relay from the engine room relay block.

Tester Connection

Condition

Specified Condition

3 - 5

When battery voltage is not applied to terminals land 2 10 kohms or higher

When battery voltage is applied to terminals 1 and 2

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Fig. 62: Identifying Headlight Relay (Head) 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

HEADLIGHT RELAY - BATTERY

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

6. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - HEADLIGHT LOW BULB)

Fig. 63: Identifying Headlight Relay (Head) And Headlight Connector Terminals

Tester Connection

Condition Specified Condition

Headlight relay terminal 1 - Body ground

Always

11 to 14 V

Headlight relay terminal 3 - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Remove the headlight relay from the engine room relay block.

b. for LH:

1. Disconnect the A10 headlight connector.

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

Standard resistance

HEADLIGHT RELAY - HEADLIGHT LOW BULB LH

c. for RH:

1. Disconnect the A11 headlight connector.

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

Standard resistance

HEADLIGHT RELAY - HEADLIGHT LOW BULB RH

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

7. CHECK HEADLIGHT (LOW BEAM)

a. Disconnect the DB ECU connector.

Tester Connection

Condition Specified Condition

Headlight relay terminal 5 - A10-2

Always

Below 1 ohms

Headlight relay terminal 5 - Body ground Always

10 kohms or higher

Tester Connection

Condition Specified Condition

Headlight relay terminal 5 - A11-2

Always

Below 1 ohms

Headlight relay terminal 5 - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra