Toyota Tundra Service Manual: Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the radio and display receiver assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.

Therefore, the radio and display receiver assembly cannot be operated using the steering pad switch assembly, and the radio and display receiver assembly itself cannot function.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

• 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 (See page ).
• 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

(a) Remove the steering pad switch assembly (See page ).

(b) Inspect the steering pad switch assembly (See page ).

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

(a) Remove the spiral cable sub-assembly (See page ).

(b) Inspect the spiral cable sub-assembly (See page ).

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

(a) Disconnect the J139 radio and display receiver assembly connector.

(b) Disconnect the J45 spiral cable sub-assembly connector.

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

Standard Resistance:

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR