Toyota Tundra. Manual — part 2481

WIRING DIAGRAM

Fig. 32: Identifying Front Fog Light - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST BY TECHSTREAM (FRONT FOG LIGHT)

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: Front fog light turns on / turns off.

NG: Go to step 2

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

2. INSPECT FUSE (FOG)

a. Remove the FOG fuse from the engine room junction block.

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

Tester Display

Test Part

Control Range Diagnostic Note

Front Fog Light Front fog light

ON or OFF

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Standard resistance

FUSE (FOG)

NG: REPLACE FUSE

OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT BULB - BATTERY)

a. for LH:

1. Disconnect the A30 front fog light connector.

Fig. 33: Identifying Front Fog Light 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

FRONT FOG LIGHT BULB - BATTERY LH

b. for RH:

Tester Connection Condition Specified Condition

FOG fuse

Always

Below 1 ohms

Tester Connection

Switch Condition

Specified

Condition

A30-2 - Body

ground

Light control switch TAIL, front fog light switch

ON

11 to 14 V

Light control switch TAIL, front fog light switch

OFF

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

1. Disconnect the A31 front fog light connector.

Fig. 34: Identifying Front Fog Light 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

FRONT FOG LIGHT BULB - BATTERY RH

NG: Go to step 4

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT FOG LIGHT BULB -
BODY GROUND)

4. INSPECT FOG LIGHT RELAY (FR FOG)

a. Remove the fog light relay from the engine room relay block.

Tester Connection

Switch Condition

Specified

Condition

A31-2 - Body

ground

Light control switch TAIL, front fog light switch

ON

11 to 14 V

Light control switch TAIL, front fog light switch

OFF

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Fig. 35: Identifying Fog Light Relay Terminals (FR FOG)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

FOG LIGHT RELAY (FR FOG)

NG: REPLACE FOG LIGHT RELAY

OK: Go to next step

5. CHECK HARNESS AND CONNECTOR (FOG LIGHT RELAY - BATTERY)

a. Remove the fog light relay from the engine room relay block.

Fig. 36: Identifying Fog Light Relay Terminals (FR FOG)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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