Audio And Visual System (W/O Multi-Display) 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 LH

INSPECT SPIRAL CABLE SUB-ASSEMBLY

AUDIO AND VISUAL SYSTEM (w/o Multi-display) - Steering Pad Switch Circuit


DESCRIPTION

This circuit sends an operation signal from the steering pad switch LH to the radio receiver assembly.
If there is an open in the circuit, the audio system cannot be operated using the steering pad switch LH.
If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.
Therefore, the radio receiver assembly cannot be operated using the steering pad switch LH, and also the radio receiver assembly itself cannot function.

WIRING DIAGRAM


Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display).Audio And Visual System (W/O Multi-Display) 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 E114 radio receiver assembly connector (for 6 speakers (w/ USB audio system)).

  1. Disconnect the E26 radio receiver assembly connector (for 6 speakers (w/o USB audio system)).

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

    Standard Resistance:
    for 6 Speakers (w/o USB Audio System)
    Tester Connection
    		Condition
    		Specified Condition
    E26-7 (SW1) - E26-6 (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
    E26-8 (SW2) - E26-6 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω
    for 6 Speakers (w/ USB Audio System)
    Tester Connection
    		Condition
    		Specified Condition
    E114-21 (SW1) - E114-23 (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
    E114-22 (SW2) - E114-23 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000012A80DHX.html)

2.INSPECT STEERING PAD SWITCH LH


  1. Disconnect the Y1 steering pad switch LH connector (w/o Front Spoiler).


    Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display).Audio And Visual System (W/O Multi-Display) Steering Pad Switch Circuit



  1. Disconnect the Y1 steering pad switch LH connector (w/ Front Spoiler).


    Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display).Audio And Visual System (W/O Multi-Display) 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
    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

    Text in Illustration
    *A
    		for Type A
    		*B
    		for Type B
    *a
    		Component without harness connected
    (Steering Pad Switch LH)
    		*b
    		Volume+
    *c
    		Volume-
    		*d
    		Seek+
    *e
    		Seek-
    		*f
    		MODE


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


3.INSPECT SPIRAL CABLE SUB-ASSEMBLY


    Corolla. Zre142 Aze141.Audio Video.Audio And Visual System (W/O Multi-Display).Audio And Visual System (W/O Multi-Display) Steering Pad Switch Circuit

  1. Disconnect the steering pad switch LH and spiral cable sub-assembly connectors.

  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
    NOTICE:
    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. Be sure to read the pages shown in the brackets.
    HINT:
    1. Removal (COROLLA_ZRE142 RM000000UWD09PX.html)
    2. Installation (COROLLA_ZRE142 RM000000UWA09QX.html)
    Text in Illustration
    *a
    		Component without harness connected
    (Spiral Cable Sub-assembly)
    *b
    		Steering Pad Switch LH Side
    *c
    		Vehicle Side


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

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