Navigation System Steering Pad Switch Circuit

Audio Visual Telematics. Corolla. Zre142 Aze141
Navigation Multi Info Display. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

INSPECT STEERING PAD SWITCH ASSEMBLY

INSPECT SPIRAL CABLE SUB-ASSEMBLY

NAVIGATION 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


Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System 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)

  1. Disconnect the radio and display receiver assembly connector.

  1. 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
    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
    E129-22 (SW2) - E129-23 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    MODE 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


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000011BR0H9X.html)

2.INSPECT STEERING PAD SWITCH ASSEMBLY


  1. Disconnect the steering pad switch assembly connector (for Type A).


    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Steering Pad Switch Circuit



  1. Disconnect the steering pad switch assembly connector (for Type B).


    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Steering Pad Switch Circuit

  1. 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
    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
    Y1-9 (AU2) - Y1-8 (EAU)
    		No switch pushed
    		95 to 105 kΩ
    MODE 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

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


NG
REPLACE STEERING PAD SWITCH ASSEMBLY (COROLLA_ZRE142 RM000002XBJ02XX.html)
OK


3.INSPECT SPIRAL CABLE SUB-ASSEMBLY

  1. Disconnect the steering pad switch assembly connector.

  1. Disconnect the spiral cable sub-assembly connector.



    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Steering Pad Switch Circuit

  1. 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

  1. 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 Assembly Side
    *c
    		Vehicle Side


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

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