Toyota Tundra Service Manual: Steering Pad Switch Circuit

Toyota Tundra Service Manual / Audio, Visual, Telematics / Audio / Video / Audio And Visual System / 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

1.	INSPECT STEERING PAD SWITCH ASSEMBLY

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

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

REPLACE STEERING PAD SWITCH ASSEMBLY

2.	INSPECT SPIRAL CABLE SUB-ASSEMBLY

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

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

REPLACE SPIRAL CABLE SUB-ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J139-21 (SW1) - J45-6 (AU1)	Always	Below 1 Ω
J139-22 (SW2) - J45-5 (AU2)	Always	Below 1 Ω
J139-23 (SWG) - J45-3 (EAU)	Always	Below 1 Ω
J139-21 (SW1) - Body ground	Always	10 kΩ or higher
J139-22 (SW2) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Speaker Circuit

Stereo Component Amplifier Power Source Circuit

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