Toyota Venza: Steering Pad Switch Circuit

Toyota Venza 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, also the navigation 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 E40 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E40-21 (SW1) - E40-23 (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
E40-22 (SW2) - E40-23 (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
E40-24 (SW3) - E40-23 (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:

Press and hold the lock located in the center of the spiral cable with sensor sub-assembly to rotate the spiral cable with sensor sub-assembly.
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 (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

Illumination Circuit

DESCRIPTION Power is supplied to the navigation receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position. WIRING DIAGRAM CAU ...

Speaker Circuit

DESCRIPTION for 6 Speakers: If there is a short in a speaker circuit, the navigation receiver assembly detects it and stops output to the speakers. Thus sound cannot be heard from the speakers ev ...

Other materials about Toyota Venza:

Operation Check
OPERATION CHECK 1. MALFUNCTION BUZZER (a) Open circuit or frozen (1) If an open circuit is detected between the ultrasonic sensors and the clearance warning ECU assembly, if a sensor malfunction is detected or if a sensor is covered with foreign matter, ...

ACIS Control Circuit
DESCRIPTION This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System). WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspe ...

Precaution
PRECAUTION NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Back Door Closer System ...