Audio Video. Audio And Visual System (W/ Multi-Display Without Dvd Player) Steering Pad Switch Circuit

Audio Visual Telematics. Corolla. Zre142 Aze141

Audio Video. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

INSPECT STEERING PAD SWITCH

INSPECT SPIRAL CABLE SUB-ASSEMBLY

AUDIO AND VISUAL SYSTEM (w/ Multi-display without DVD Player) - Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly*1 or steering pad switch LH*2 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*1 or steering pad switch LH*2.
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*1 or steering pad switch LH*2, and also the radio and display receiver assembly itself cannot function.

*1: w/ Steering Pad Switch Assembly
*2: w/ Steering Pad Switch LH

WIRING DIAGRAM

Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display).Audio And Visual System (W/ Multi-Display Without Dvd Player) Steering Pad Switch Circuit

INSPECTION PROCEDURE

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 (COROLLA_ZRE142 RM000000KT10H0X.html).

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

Disconnect the E129 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E129-21 (SW1) - E129-23 (SWG)	No switch pushed	95 to 105 kΩ
	Seek+ switch pushed	Below 2.5 Ω
	Seek- switch pushed	313 to 345 Ω
	Volume+ switch pushed	950 to 1050 Ω
	Volume- switch pushed	2955 to 3265 Ω
E129-22 (SW2) - E129-23 (SWG)	No switch pushed	95 to 105 kΩ
	MODE switch pushed	Below 2.5 Ω
	On hook switch pushed*1	313 to 345 Ω
	Off hook switch pushed*1	950 to 1050 Ω
	Voice switch pushed*1	2955 to 3265 Ω

*1: w/ Steering Pad Switch Assembly

Go to step 2

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000011BR0HQX.html)

2.INSPECT STEERING PAD SWITCH

Disconnect the Y1 steering pad switch assembly*1 or steering pad switch LH*2 connector (for Type A).
1. *1: w/ Steering Pad Switch Assembly
2. *2: w/ Steering Pad Switch LH

Disconnect the Y1 steering pad switch assembly*1 or steering pad switch LH*2 connector (for Type B).
1. *1: w/ Steering Pad Switch Assembly
2. *2: w/ Steering Pad Switch LH

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Y1-10 (AU1) - Y1-8 (EAU)	No switch pushed	95 to 105 kΩ
	Seek+ switch pushed	Below 2.5 Ω
	Seek- switch pushed	313 to 345 Ω
	Volume+ switch pushed	950 to 1050 Ω
	Volume- switch pushed	2955 to 3265 Ω
Y1-9 (AU2) - Y1-8 (EAU)	No switch pushed	95 to 105 kΩ
	MODE switch pushed	Below 2.5 Ω
	On hook switch pushed*1	313 to 345 Ω
	Off hook switch pushed*1	950 to 1050 Ω
	Voice switch pushed*1	2955 to 3265 Ω

*1: w/ Steering Pad Switch Assembly

Text in Illustration
*A	for Type A	*B	for Type B
*C	w/ Steering Pad Switch Assembly	-	-
*a	Component without harness connected (Steering Pad Switch)	*b	Volume+
*c	Volume-	*d	Seek+
*e	Seek-	*f	MODE
*g	On hook	*h	Off hook
*i	Voice	-	-

REPLACE STEERING PAD SWITCH (COROLLA_ZRE142 RM000002XBJ02XX.html)

OK

3.INSPECT SPIRAL CABLE SUB-ASSEMBLY

Disconnect the Y1 steering pad switch assembly*1 or steering pad switch LH*2 connector.
1. *1: w/ Steering Pad Switch Assembly
2. *2: w/ Steering Pad Switch LH

Disconnect the E6 spiral cable sub-assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Y1-8 (EAU) - E6-4 (EAU)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
Y1-10 (AU1) - E6-6 (AU1)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right
Y1-9 (AU2) - E6-5 (AU2)	Center	Below 1 Ω
	2.5 rotations to the left
	2.5 rotations to the right

After setting the spiral cable sub-assembly to the center position, rotate the spiral cable sub-assembly 2.5 times clockwise. Then while rotating the spiral cable sub-assembly 5 times counterclockwise, measure the resistance as shown in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
Y1-8 (EAU) - E6-4 (EAU)
Always
Below 1 Ω
Y1-10 (AU1) - E6-6 (AU1)
Always
Below 1 Ω
Y1-9 (AU2) - E6-5 (AU2)
Always
Below 1 Ω
NOTICE:
1. The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.
2. As the spiral cable sub-assembly may break, do not rotate the spiral cable sub-assembly more than the specified amount.
HINT:
1. Removal (COROLLA_ZRE142 RM000000UWD09PX.html)
Text in Illustration
*a
Component without harness connected
(Spiral Cable Sub-assembly)
*b
Steering Pad Switch Side
*c
Vehicle Side

Text in Illustration
*a	Component without harness connected (Spiral Cable Sub-assembly)
*b	Steering Pad Switch Side
*c	Vehicle Side

REPLACE SPIRAL CABLE SUB-ASSEMBLY (COROLLA_ZRE142 RM000000UWD09PX.html)

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