Audio And Visual System (For Sedan) Steering Pad Switch Circuit

AudioVisualTelematics. Yaris. Ncp93, 131
Audio Video. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT RADIO RECEIVER ASSEMBLY

INSPECT STEERING PAD SWITCH ASSEMBLY

INSPECT SPIRAL CABLE SUB-ASSEMBLY

AUDIO AND VISUAL SYSTEM (for Sedan) - Steering Pad Switch Circuit


DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the radio receiver assembly.
If there is an open in the circuit, the radio system cannot be operated using the steering pad switch assembly.
If there is a short in the circuit, the resulting condition is the same as if a switch were continuously pressed. Therefore, the radio receiver assembly cannot be operated using the steering pad switch assembly, and the radio receiver assembly itself cannot function.

WIRING DIAGRAM


Yaris. Ncp93, 131.Audio Video.Audio And Visual System (For Sedan).Audio And Visual System (For Sedan) Steering Pad Switch Circuit


INSPECTION PROCEDURE

NOTICE:
The vehicle is equipped with an SRS (Supplemental Restraint System). Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System (YARIS_NCP93 RM000000KT10D1X.html).
1.INSPECT RADIO RECEIVER ASSEMBLY


    Yaris. Ncp93, 131.Audio Video.Audio And Visual System (For Sedan).Audio And Visual System (For Sedan) Steering Pad Switch Circuit

  1. Disconnect the D74 radio receiver assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D74-7 (SW1) - D74-6 (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
    D74-8 (SW2) - D74-6 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Radio Receiver Assembly)


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM0000012A809KX.html)

2.INSPECT STEERING PAD SWITCH ASSEMBLY


  1. Remove the steering pad switch assembly (YARIS_NCP93 RM0000013RC00WX.html).


    Yaris. Ncp93, 131.Audio Video.Audio And Visual System (For Sedan).Audio And Visual System (For Sedan) Steering Pad Switch Circuit


    Text in Illustration
    *1
    		SEEK Switch
    		*2
    		VOL Switch
    *3
    		MODE Switch
    		-
    		-
    *a
    		Component without harness connected
    (Steering Pad Switch Assembly)
    		-
    		-

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

    Standard Resistance:

    Tester Connection
    		Switch Condition
    		Specified Condition
    V2-10 (AU1) - V2-8 (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
    V2-9 (AU2) - V2-8 (EAU)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω


NG
REPLACE STEERING PAD SWITCH ASSEMBLY (YARIS_NCP93 RM0000013RC00WX.html)
OK


3.INSPECT SPIRAL CABLE SUB-ASSEMBLY


    Yaris. Ncp93, 131.Audio Video.Audio And Visual System (For Sedan).Audio And Visual System (For Sedan) Steering Pad Switch Circuit

  1. Remove the spiral cable sub-assembly (YARIS_NCP93 RM000000V6R023X.html).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    V2-8 (EAU) - D3-4 (EAU)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    		Below 1 Ω
    2.5 rotations to the right
    		Below 1 Ω
    V2-10 (AU1) - D3-6 (AU1)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    		Below 1 Ω
    2.5 rotations to the right
    		Below 1 Ω
    V2-9 (AU2) - D3-5 (AU2)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    		Below 1 Ω
    2.5 rotations to the right
    		Below 1 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Spiral Cable Sub-assembly)
    *b
    		Steering Pad Switch Assembly Side
    *c
    		Vehicle Side
    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. Refer to the pages shown in the brackets.
    HINT:
    1. Removal (YARIS_NCP93 RM000000V6R023X.html)
    2. Installation (YARIS_NCP93 RM000000V6O023X.html)


NG
REPLACE SPIRAL CABLE SUB-ASSEMBLY (YARIS_NCP93 RM000000V6R023X.html)
OK

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