Toyota Tundra. Manual — part 428

Fig. 44: Meter Illumination Does Not Dim At Night - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

a. Check for DTCs (see DTC CHECK/CLEAR ).

Result

DTC RESULT REFERENCE

B: Go to CAN COMMUNICATION SYSTEM (See CAN COMMUNICATION SYSTEM )

A: Go to next step

2. READ VALUE OF TECHSTREAM (LIGHT CONTROL RHEOSTAT)

a. Operate the Techstream according to the display and select "DATA LIST" or "Data List" (see

DATA LIST / ACTIVE TEST ).

Techstream

Combination Meter:

Result

Proceed to

CAN communication system DTC is not output

A

CAN communication system DTC is output

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

TECHSTREAM COMBINATION METER SPECIFICATIONS

OK: Light brightness can be changed within specified range by manual operation.

NG: Go to step 3

OK: REPLACE COMBINATION METER ASSEMBLY (see REMOVAL )

3. INSPECT LIGHT CONTROL RHEOSTAT

Tester

Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

TAIL Cancel

SW*

TAIL cancel switch
condition/ON or OFF

ON: TAIL cancel switch ON
OFF: TAIL cancel switch OFF

-

Rheostat

value

Light control rheostat switch
input/Min.: 0, Max.: 100

Light control rheostat switch is
Dark (0) --> Bright (100)

Unit: %

HINT:
*: w/ TAIL cancel switch

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

Fig. 45: 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 value(s) in the table below.

Standard resistance:

w/o TAIL Cancel Switch

RESISTANCE W/O TAIL CANCEL SWITCH REFERENCE

w/ TAIL Cancel Switch

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

RESISTANCE W/ TAIL CANCEL SWITCH REFERENCE

NG: REPLACE LIGHT CONTROL RHEOSTAT (see REMOVAL )

OK: Go to next step

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

RHEOSTAT)

a. Disconnect the J28 meter connector.

Fig. 46: Identifying L4 Rheostat Connector Terminal J28 Meter Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the L4 rheostat connector.

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

Standard resistance:

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)

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra