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

Toyota Tacoma 2015-2018 Service Manual / Navigation / Multi Info Display / Navigation System / Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the navigation 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 navigation receiver assembly cannot be operated using the steering pad switch assembly, and also the navigation 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 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
N25-21 (SW1) - N25-23 (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
N25-22 (SW2) - N25-23 (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 Navigation 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 (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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