Toyota Tundra. Manual — part 427

a. Remove the PANEL fuse from the main body ECU.

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

Standard resistance

FUSE (PANEL) RESISTANCE REFERENCE

NG: REPLACE FUSE

OK: Go to next step

3. CHECK HARNESS AND CONNECTOR (ACCESSORY METER - BATTERY)

a. Disconnect the K20 accessory meter connector.

Fig. 41: Identifying K20 Accessory Meter Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard voltage

HARNESS AND CONNECTOR (ACCESSORY METER - BATTERY) VOLTAGE
SPECIFICATIONS

Result

HARNESS AND CONNECTOR (ACCESSORY METER - BATTERY) RESULT
REFERENCE

Tester Connection Condition Specified Condition

PANEL fuse

Always

Below 1 ohms

Tester Connection

Switch Condition

Specified Condition

K20-21 (ILL+) - Body ground Light control switch ON

11 to 14 V

Result

Proceed to

OK (w/ Cruise information)

A

OK (w/o Cruise information)

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

B: Go to step 7

C: REPAIR OR REPLACE HARNESS OR CONNECTOR

A: Go to next step

4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ACCESSORY METER

AND BODY GROUND)

a. Disconnect the J28 combination meter connector.

Fig. 42: Identifying J28 Combination Meter Connector Terminal K20 Accessory Meter
Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the K20 accessory meter connector.

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

Standard resistance

HARNESS AND CONNECTOR (COMBINATION METER - ACCESSORY METER AND
BODY GROUND) RESISTANCE REFERENCE

NG

C

Tester Connection

Condition Specified Condition

J28-37 (ILL-) - K20-20 (ILL-)

Always

Below 1 ohms

J28-40(E1)-Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

5. REPLACE ACCESSORY METER ASSEMBLY

a. Temporarily replace the accessory meter with a new or normally functioning one (see ON-

VEHICLE INSPECTION ).

6. CHECK ACCESSORY METER ASSEMBLY (OPERATION)

a. Check the accessory meter operation.

OK: Operation of the accessory meter returns to normal.

NG: REPLACE COMBINATION METER ASSEMBLY (see REMOVAL )

OK: END (ACCESSORY METER IS DEFECTIVE)

7. CHECK HARNESS AND CONNECTOR (ACCESSORY METER - BODY GROUND)

a. Disconnect the K20 accessory meter connector.

Fig. 43: Identifying K20 Accessory Meter Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

HARNESS AND CONNECTOR (ACCESSORY METER - BODY GROUND) RESISTANCE
REFERENCE

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

J28-37 (ILL-) - Body ground

Always

10 kohms or higher

Tester Connection

Condition Specified Condition

K20-12 (E) - Body ground Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra

8. REPLACE ACCESSORY METER ASSEMBLY

a. Temporarily replace the accessory meter with a new or normally functioning one (see ON-

VEHICLE INSPECTION ).

9. CHECK ACCESSORY METER ASSEMBLY (OPERATION)

a. Check that the accessory meter operation is normal.

OK: Operation of the accessory meter returns to normal.

NG: REPLACE COMBINATION METER ASSEMBLY (see REMOVAL )

OK: END (ACCESSORY METER IS DEFECTIVE)

METER ILLUMINATION DOES NOT DIM AT NIGHT

DESCRIPTION

If the dimmer switch is turned to TAIL, HEAD or AUTO, the main body ECU sends a TAIL relay signal, panel
light illumination signal, panel relay signal, and TAIL cancel OFF signal* to the combination meter via CAN
communication. Then the meter and accessory meter become dim.

HINT:



*: w/ TAIL cancel switch



TAIL cancel switch: When the headlights are illuminated and the TAIL cancel switch is turned on, the
meter and accessory meter do not dim.

WIRING DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Meter - Tundra