NAVIGATION SYSTEM Steering Pad Switch Circuit

Click here

DESCRIPTION

This circuit sends an operation signal from the steering pad switch 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.

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 and the radio and display receiver assembly itself cannot function.

Click here

INSPECTION PROCEDURE

Click here

PROCEDURE

1. Click here

   INSPECT STEERING PAD SWITCH ASSEMBLY

   
   
   1. 

      Remove the steering pad switch assembly (Click here).

      Table 1. Text in Illustration

      *A	w/ Transmission Shift Switch	-	-
      *1	Volume- Switch	*2	Volume+ Switch
      *3	Seek- Switch	*4	Seek+ Switch
      *5	MODE Switch	*6	Off Hook Switch
      *7	On Hook Switch	*8	Voice Switch

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

      Standard Resistance

      Tester Connection Switch Condition Specified Condition 10 (AU1) - 8 (EAU) No switch is pushed 95 to 105 kΩ Seek+ switch is pushed Below 2.5 Ω Seek- switch is pushed 312 to 345 Ω Volume+ switch is pushed 950 to 1050 Ω Volume- switch is pushed 2954 to 3265 Ω 9 (AU2) - 8 (EAU) No switch is pushed 95 to 105 kΩ MODE switch is pushed Below 2.5 Ω On Hook switch is pushed 312 to 345 Ω Off Hook switch is pushed 950 to 1050 Ω Voice switch is pushed 2954 to 3265 Ω

   
   
   • OKClick here
   • NGClick here
2. Click here

   INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

   
   
   1. 

      Remove the spiral with sensor cable sub-assembly (Click here).

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

      Standard Resistance

      Tester Connection Condition Specified Condition 8 (EAU) - 4 (EAU) Spiral cable is turned 2.5 rotations counterclockwise Below 1 Ω Spiral cable is centered Spiral cable is turned 2.5 rotations clockwise 10 (AU1) - 6 (AU1) Spiral cable is turned 2.5 rotations counterclockwise Spiral cable is centered Spiral cable is turned 2.5 rotations clockwise 9 (AU2) - 5 (AU2) Spiral cable is turned 2.5 rotations counterclockwise Spiral cable is centered Spiral cable is turned 2.5 rotations clockwise

      Table 2. Text in Illustration

      *a	Steering Pad Switch Side
      *b	Vehicle Side

      CAUTION:

      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. Be sure to read the Precaution for the SRS (Click here).

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY)

   
   

   1. Disconnect the H105 radio and display receiver assembly connector.

   2. Disconnect the H11 spiral with sensor cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H105-21 (SW1) - H11-6 (AU1) Always Below 1 Ω H105-22 (SW2) - H11-5 (AU2) H105-23 (SWG) - H11-4 (EAU) H105-21 (SW1) - Body ground Always 10 kΩ or higher H105-22 (SW2) - Body ground H105-23 (SWG) - Body ground

   
   
   • OKClick here
   • NGClick here
4. Click here

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

5. Click here

   REPLACE STEERING PAD SWITCH ASSEMBLYClick here

6. Click here

   REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLYClick here

7. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR