Toyota Tundra Service Manual: Illumination Circuit

DESCRIPTION

Power is supplied to the radio and display receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

PROCEDURE

1.

CHECK METER / GAUGE SYSTEM

(a) Check if the rheostat function operates normally.

OK:

The rheostat function operates normally.

NG

GO TO METER / GAUGE SYSTEM

OK

2.

CHECK LIGHTING SYSTEM

(a) Check if the instrument panel illumination comes on normally.

OK:

The instrument panel illumination comes on normally.

NG

GO TO LIGHTING SYSTEM

OK

3.

CHECK ILLUMINATION

(a) Check if the illumination for the steering pad switch assembly or radio and display receiver assembly comes on when the light control switch is turned to the head or tail position.

Result

Proceed to

Illumination for steering pad switch assembly does not come on.

A

Illumination for navigation receiver assembly does not come on.

B

B

GO TO STEP 7

A

4.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the spiral cable sub-assembly connector.

Click here

*a

Front view of wire harness connector

(to Spiral Cable Sub-assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J45-12 (IL+2) - Body ground

Light control switch in the tail or head position

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly.

Click here

(b) Inspect the steering pad switch assembly.

Click here

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

6.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly.

Click here

(b) Inspect the spiral cable sub-assembly.

Click here

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

7.

CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the radio and display receiver assembly connector.

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J137-10 (ILL+) - Body ground

Light control switch in tail or head position

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the J138 radio and display receiver assembly connector.

(b) Disconnect the J28 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J138-5 (ILL-) - J28-22 (ILL-)

Always

Below 1 Ω

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    How To Proceed With Troubleshooting

    Illumination for Panel Switch does not Come on with Tail Switch ON

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