NAVIGATION SYSTEM (for HDD) > Steering Pad Switch Circuit

for Preparation Click here


DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the navigation computer sub-assembly.
If there is an open in the circuit, the navigation 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 the switch were continuously pressed. Therefore, the navigation computer sub-assembly cannot be operated using the steering pad switch assembly, and the navigation computer sub-assembly itself cannot function.

WIRING DIAGRAM


E187391E07


INSPECTION PROCEDURE

NOTICE:
The vehicle is equipped with a Supplemental Restraint System (SRS). Before servicing (including removal or installation of parts), be sure to read Precaution for Supplemental Restraint System (Click here).

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

  1. Disconnect the H60 navigation computer sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H60-25 (SW1) - H60-23 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    H60-25 (SW1) - H60-23 (SWG)
    		Seek+ switch pushed
    		Below 2.5 Ω
    H60-25 (SW1) - H60-23 (SWG)
    		Seek- switch pushed
    		313 to 345 Ω
    H60-25 (SW1) - H60-23 (SWG)
    		Volume+ switch pushed
    		950 to 1050 Ω
    H60-25 (SW1) - H60-23 (SWG)
    		Volume- switch pushed
    		2955 to 3265 Ω
    H60-24 (SW2) - H60-23 (SWG)
    		No switch pushed
    		95 to 105 kΩ
    H60-24 (SW2) - H60-23 (SWG)
    		MODE switch pushed
    		Below 2.5 Ω
    H60-24 (SW2) - H60-23 (SWG)
    		Voice switch pushed
    		2955 to 3265 Ω
    H60-24 (SW2) - H60-23 (SWG)
    		On Hook switch pushed
    		323 to 335 Ω
    H60-24 (SW2) - H60-23 (SWG)
    		Off Hook switch pushed
    		950 to 1050 Ω



NG
Go to step 2
OK

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

2.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H60 navigation computer sub-assembly connector.

  1. Disconnect the H30 spiral with sensor cable sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-25 (SW1) - H30-6 (AU1)
    		Always
    		Below 1 Ω
    H60-24 (SW2) - H30-5 (AU2)
    		Always
    		Below 1 Ω
    H60-23 (SWG) - H30-3 (EAU)
    		Always
    		Below 1 Ω
    H60-25 (SW1) - Body ground
    		Always
    		10 kΩ or higher
    H60-24 (SW2) - Body ground
    		Always
    		10 kΩ or higher
    H60-23 (SWG) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


    E210267E01

  1. Disconnect the z4 steering pad switch assembly and H30 spiral with sensor cable sub-assembly connectors.

  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 with sensor 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


4.INSPECT STEERING PAD SWITCH ASSEMBLY


  1. Disconnect the z4 steering pad switch assembly connector.


    E210270E01

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

    Standard Resistance:

    Tester Connection
    		Switch Condition
    		Specified Condition
    z4-11 (AU1) - z4-8 (EAU)
    		No switch pushed
    		95 to 105 kΩ
    z4-11 (AU1) - z4-8 (EAU)
    		Seek+ switch pushed
    		Below 2.5 Ω
    z4-11 (AU1) - z4-8 (EAU)
    		Seek- switch pushed
    		313 to 345 Ω
    z4-11 (AU1) - z4-8 (EAU)
    		Volume+ switch pushed
    		950 to 1050 Ω
    z4-11 (AU1) - z4-8 (EAU)
    		Volume- switch pushed
    		2955 to 3265 Ω
    z4-10 (AU2) - z4-8 (EAU)
    		No switch pushed
    		95 to 105 kΩ
    z4-10 (AU2) - z4-8 (EAU)
    		MODE switch pushed
    		Below 2.5 Ω
    z4-10 (AU2) - z4-8 (EAU)
    		Voice switch pushed
    		2955 to 3265 Ω
    z4-10 (AU2) - z4-8 (EAU)
    		On Hook switch pushed
    		323 to 335 Ω
    z4-10 (AU2) - z4-8 (EAU)
    		Off Hook switch pushed
    		950 to 1050 Ω


Text in Illustration 
*1
MODE
*2
Volume+
*3
Volume-
*4
Seek+
*5
Seek-
*6
Voice
*7
Off Hook
*8
On Hook
*a
Component without harness connected
(Steering Pad Switch Assembly)
-
-


NG
REPLACE STEERING PAD SWITCH ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)