Toyota Tundra. Manual — part 426

2. INSPECT LIGHT CONTROL RHEOSTAT

Fig. 38: Light Control Rheostat Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Remove the light control rheostat (see REMOVAL ).

b. Measure the resistance according to the table below.

Standard resistance:

w/o TAIL Cancel Switch

STANDARD RESISTANCE W/O TAIL CANCEL SWITCH REFERENCE

Tester Connection

Switch Condition

Specified Condition

3 (RV) -1 (E)

Downward --> Upward

See illustration

7 (T) -1 (E)

Downward --> Upward 10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

w/ TAIL Cancel Switch

STANDARD RESISTANCE W/ TAIL CANCEL SWITCH REFERENCE

NG: REPLACE LIGHT CONTROL RHEOSTAT (see REMOVAL )

OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL

RHEOSTAT)

a. Disconnect the J28 meter connector.

b. Disconnect the L4 rheostat connector.

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

Standard resistance:

w/o TAIL Cancel Switch

STANDARD RESISTANCE W/O TAIL CANCEL SWITCH REFERENCE

w/ TAIL Cancel Switch

STANDARD RESISTANCE W/ TAIL CANCEL SWITCH REFERENCE

Tester Connection

Switch Condition

Specified Condition

3 (RV) -1 (E)

Downward --> Upward

See illustration

5 (TC) -1 (E)

Downward --> Upward 10 kohms or higher

7 (T) -1 (E)

Tester Connection

Condition Specified Condition

J28-1 (RHIG) - L4-7 (T)

Always

Below 1 ohms

J28-2 (TR) - L4-3 (RV)

J28-3 (E2) - L4-1 (E)

Tester Connection

Condition Specified Condition

J28-1 (RHIG) - L4-7 (T)

Always

Below 1 ohms

J28-2 (TR) - L4-3 (RV)

J28-3 (E2) - L4-1 (E)

J28-38 (TC) - L4-5 (TC)

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

Fig. 39: Identifying L4 Rheostat Connector Terminal J28 Meter Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE COMBINATION METER ASSEMBLY (see REMOVAL )

METER ILLUMINATION IS ALWAYS DARK

DESCRIPTION

When the ignition switch is turned to ACC or ON, the accessory meter operates as follows.

w/ Cruise information:

The accessory meter receives light control switch signals and combination meter signals, and performs
illumination dim operations.

w/o Cruise information:

The accessory meter receives light control switch signals and performs illumination dim operations.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

WIRING DIAGRAM

Fig. 40: Meter Illumination Is Always Dark - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK ILLUMINATION FUNCTION

a. Check the illumination function.

Result

ILLUMINATION FUNCTION RESULT REFERENCE

B: Go to PROBLEM SYMPTOMS TABLE

A: Go to next step

2. INSPECT FUSE (PANEL)

Result

Proceed to

Accessory meter illumination is always dark

A

Combination meter illumination is always dark

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra