Toyota Venza: Steering Pad Switch Circuit

Toyota Venza 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 the radio and display receiver assembly itself will not 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 precaution for Supplemental Restraint System (See page ).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

(a) Disconnect the E42 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E42-21 (SW1) - E42-23 (SWG)	No switch pushed	95 to 105 kΩ
	Up switch pushed	Below 2.5 Ω
	Down switch pushed	313 to 345 Ω
	Volume+ switch pushed	950 to 1050 Ω
	Volume- switch pushed	2955 to 3265 Ω
E42-22 (SW2) - E42-23 (SWG)	No switch pushed	95 to 105 kΩ
	MODE/HOLD switch pushed	Below 2.5 Ω
	On hook switch pushed	313 to 345 Ω
	Off hook switch pushed	950 to 1050 Ω
	Voice switch pushed	2955 to 3265 Ω
E42-24 (SW3) - E42-23 (SWG)	No switch pushed	95 to 105 kΩ
	Enter switch pushed	Below 2.5 Ω
	Back switch pushed	313 to 345 Ω
	Right switch pushed	950 to 1050 Ω
	Left switch pushed	2955 to 3265 Ω

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 ).

Text in Illustration

*a	Component without harness connected (Steering Pad Switch Assembly)	*b	Volume+
*c	Volume-	*d	Back
*e	MODE/HOLD	*f	Up
*g	Down	*h	Left
*i	Right	*j	Enter
*k	Off hook	*l	On hook
*m	Voice	-	-

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
10 (AU1) - 7 (EAU)	No switch pushed	95 to 105 kΩ
	Up switch pushed	Below 2.5 Ω
	Down switch pushed	313 to 345 Ω
	Volume+ switch pushed	950 to 1050 Ω
	Volume- switch pushed	2955 to 3265 Ω
9 (AU2) - 7 (EAU)	No switch pushed	95 to 105 kΩ
	MODE/HOLD switch pushed	Below 2.5 Ω
	On hook switch pushed	313 to 345 Ω
	Off hook switch pushed	950 to 1050 Ω
	Voice switch pushed	2955 to 3265 Ω
8 (AU3) - 7 (EAU)	No switch pushed	95 to 105 kΩ
	Enter switch pushed	Below 2.5 Ω
	Back switch pushed	313 to 345 Ω
	Right switch pushed	950 to 1050 Ω
	Left switch pushed	2955 to 3265 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z5-7 (EAU) - D18-3 (EAU)	Center	3 Ω or less
	2.5 rotations to the left
	2.5 rotations to the right
z5-10 (AU1) - D18-6 (AU1)	Center	3 Ω or less
	2.5 rotations to the left
	2.5 rotations to the right
z5-9 (AU2) - D18-5 (AU2)	Center	3 Ω or less
	2.5 rotations to the left
	2.5 rotations to the right
z5-8 (AU3) - D18-4 (AU3)	Center	3 Ω or less
	2.5 rotations to the left
	2.5 rotations to the right

(c) After setting the spiral cable with sensor sub-assembly to the center position, rotate the spiral cable with sensor sub-assembly 2.5 times clockwise. Then while rotating the spiral cable with sensor sub-assembly 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z5-7 (EAU) - D18-3 (EAU)	Always	3 Ω or less
z5-10 (AU1) - D18-6 (AU1)	Always	3 Ω or less
z5-9 (AU2) - D18-5 (AU2)	Always	3 Ω or less
z5-8 (AU3) - D18-4 (AU3)	Always	3 Ω or less

NOTICE:

The spiral cable with sensor sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable with sensor sub-assembly may prevent the airbag from deploying.
As the spiral cable with sensor sub-assembly may break, do not rotate the spiral cable with sensor sub-assembly more than the specified amount.

Text in Illustration

Component without harness connected

(Spiral Cable with Sensor Sub-assembly)

Steering Pad Switch Assembly Side

Vehicle Side

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

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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