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

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the multi-media module 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 to when a switch is continuously depressed occurs.

Therefore, the multi-media module receiver assembly cannot be operated using the steering pad switch assembly, also the multi-media module receiver assembly itself will not function.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

   
   

   1. Disconnect the H97 multi-media module receiver assembly connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition H97-30 (SW1) - H97-32 (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 H97-31 (SW2) - H97-32 (SWG) No switch pushed 95 to 105 kΩ MODE switch pushed Below 2.5 Ω Voice switch pushed 2955 to 3265 Ω Voice return switch pushed 313 to 345 Ω On hook switch pushed Off hook switch pushed 950 to 1050 Ω

   
   
   • OK

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

   • NGClick here
2. Click here

   INSPECT STEERING PAD SWITCH ASSEMBLY

   
   

   1. Remove the steering pad switch assembly (Click here).

   2. 

      Measure the resistance according to the values in the table below.

      Standard Resistance

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

      Table 1. Text in Illustration

      *a	Component without harness connected (Steering Pad Switch Assembly)	*b	Seek+
      *c	Volume+	*d	Volume-
      *e	MODE	*f	Seek-
      *g	Voice	*h	Off Hook
      *i	On Hook	*j	Voice Return

   
   
   • OKClick here
   • NG

     REPLACE STEERING PAD SWITCH ASSEMBLY (Click here)

3. Click here

   INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

   
   

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

   2. 

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

      Standard Resistance
      Tester Connection Condition Specified Condition z5-8 (EAU) - H22-3 (EAU) Center 3 Ω or less 2.5 rotations to the left 2.5 rotations to the right z5-11 (AU1) - H22-6 (AU1) Center 3 Ω or less 2.5 rotations to the left 2.5 rotations to the right z5-10 (AU2) - H22-5 (AU2) Center 3 Ω or less 2.5 rotations to the left 2.5 rotations to the right

   3. After setting the spiral cable with sensor sub-assembly to the center position, rotate the spiral cable with sensor sub-assembly 2.5 times clockwise. Then while rotating the spiral cable with sensor sub-assembly 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition z5-8 (EAU) - H22-3 (EAU) Always 3 Ω or less z5-11 (AU1) - H22-6 (AU1) Always 3 Ω or less z5-10 (AU2) - H22-5 (AU2) Always 3 Ω or less

      Note:
      

      • Press and hold the lock located in the center of the spiral cable with sensor sub-assembly to rotate the spiral cable with sensor sub-assembly.

      • The spiral cable with sensor sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable with sensor sub-assembly may prevent the airbag from deploying.

      • As the spiral cable with sensor sub-assembly may break, do not rotate the spiral cable with sensor sub-assembly more than the specified amount.

      Table 2. Text in Illustration

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

   
   
   • OK

     REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

   • NG

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