Toyota Tacoma 2015-2018 Service Manual: Steering Pad Switch Circuit

Toyota Tacoma 2015-2018 Service Manual / 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 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

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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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 ).

REPLACE STEERING PAD SWITCH ASSEMBLY

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 ).

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

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

DESCRIPTION for Audio Function: The radio and display receiver assembly receives a vehicle speed signal from the combination meter assembly and sends the signal to radio and display ...

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 DIAGR ...

Other materials:

System Description
SYSTEM DESCRIPTION 1. SYSTEM DESCRIPTION The following pattern will be used: "Operation" indicates user operation using the smart key system. "Expected operation of the vehicle" indicates how a known good vehicle will react in accordance with each operation. "Suspected ...

List of storage features
Glove box Overhead console (Access Cab and Double Cab models) Bottle holders Auxiliary boxes Front console box (separated type front seat only) Cup holders CAUTION ■Items that should not be left in the storage spaces Do not leave glasses, lighters or spray cans in the stora ...

Diagnosis System
DIAGNOSIS SYSTEM 1. CHECK DLC3 (a) The vehicle's ECU uses the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. Symbols (Terminal No.) Terminal Description Condition ...