AUDIO AND VISUAL SYSTEM (w/o Navigation System) > Steering Pad Switch Circuit

for Preparation Click here


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 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 receiver assembly cannot be operated using the steering pad switch assembly, and also the radio receiver assembly itself cannot function.

WIRING DIAGRAM


E222736E02


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 (Click here).

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

  1. Disconnect the radio receiver assembly connector.

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

    Standard Resistance:
    for 10 Speakers 
    Tester Connection
    		Condition
    		Specified Condition
    H52-7 (SW1) - H52-6 (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
    H52-8 (SW2) - H52-6 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω
    Voice switch pushed
    		2955 to 3265 Ω
    On hook switch pushed
    		313 to 345 Ω
    Off hook switch pushed
    		950 to 1050 Ω
    for 6 Speakers 
    Tester Connection
    		Condition
    		Specified Condition
    H47-21 (SW1) - H47-23 (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
    H47-22 (SW2) - H47-23 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω
    Voice switch pushed*1
    		2955 to 3265 Ω
    On hook switch pushed*1
    		313 to 345 Ω
    Off hook switch pushed*1
    		950 to 1050 Ω

    1. *1: w/ Telephone Microphone Assembly



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.INSPECT STEERING PAD SWITCH ASSEMBLY

  1. Disconnect the steering pad switch assembly connector.



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


    E210270E03


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    z4-11 (AU1) - z4-8 (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
    z4-10 (AU2) - z4-8 (EAU)
    		No switch pushed
    		95 to 105 kΩ
    MODE switch pushed
    		Below 2.5 Ω
    Voice switch pushed*1
    		2955 to 3265 Ω
    On hook switch pushed*1
    		313 to 345 Ω
    Off hook switch pushed*1
    		950 to 1050 Ω

    1. *1: w/ Telephone Microphone Assembly

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



NG
REPLACE STEERING PAD SWITCH ASSEMBLY (Click here)
OK


3.INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

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



    E210267E03

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z4-8 (EAU) - H30-3 (EAU)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    z4-11 (AU1) - H30-6 (AU1)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    z4-10 (AU2) - H30-5 (AU2)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right

  1. After setting the spiral with sensor cable sub-assembly to the center position, rotate the spiral with sensor cable sub-assembly 2.5 times clockwise. Then while rotating the spiral with sensor cable sub-assembly 5 times counterclockwise, measure the resistance as shown in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    z4-8 (EAU) - H30-3 (EAU)
    		Always
    		Below 1 Ω
    z4-11 (AU1) - H30-6 (AU1)
    		Always
    		Below 1 Ω
    z4-10 (AU2) - H30-5 (AU2)
    		Always
    		Below 1 Ω

    NOTICE:
    1. The spiral with sensor cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral with sensor cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.
    2. As the spiral with sensor cable sub-assembly may break, do not rotate the spiral with sensor cable sub-assembly more than the specified amount.

    HINT:
    1. Removal (Click here)
    2. Installation (Click here)

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



NG
REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (Click here)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR