Toyota Tacoma manuals

Toyota Tacoma 2015-2018 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 a switch is continuously depressed occurs.

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 precautionary notice for the Supplemental Restraint System (See page PROCEDURE ).

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

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

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

R31-21 (SW1) - R31-23 (SWG)

No switch is pushed

99 to 101 kΩ

Volume+ is pushed

1000 to 1020 Ω

Volume- is pushed

3178 to 3242 Ω

Seek+ is pushed

Below 2.5 Ω

Seek- is pushed

327 to 333 Ω

R31-22 (SW2) - R31-23 (SWG)

No switch is pushed

99 to 101 kΩ

MODE switch is pushed

Below 2.5 Ω

On Hook switch is pushed

327 to 333 Ω

Off Hook switch is pushed

1000 to 1020 Ω

Voice switch is pushed

3178 to 3242 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT STEERING PAD SWITCH ASSEMBLY

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

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

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

3.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

(a) Remove the spiral cable with sensor sub-assembly (See page (b) Inspect the spiral cable with sensor sub-assembly (See page ).

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

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)

NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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