NAVIGATION SYSTEM Steering Pad Switch Circuit

DESCRIPTION

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

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 assembly, and also the radio and display receiver assembly itself cannot function.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

   
   
   1. 

      Disconnect the radio and display receiver assembly connector.

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

      Standard Resistance

      Tester Connection Switch Condition Specified Condition F115-21 (SW1) - F115-23 (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 F115-22 (SW2) - F115-23 (SWG) No switch pushed 95 to 105 kΩ MODE switch pushed Below 2.5 Ω On Hook switch pushed 313 to 345 Ω Off Hook switch pushed 950 to 1050 Ω

      Table 1. Text in Illustration

      *a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

   
   
   • OK

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

   • NGClick here
2. Click here

   INSPECT STEERING PAD SWITCH ASSEMBLY

   
   

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

   
   
   • OKClick here
   • NG

     REPLACE STEERING PAD SWITCH ASSEMBLY (Click here)

3. Click here

   INSPECT SPIRAL CABLE SUB-ASSEMBLY

   
   

   1. Inspect the spiral cable sub-assembly (Click here).

      Note:

      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.

      Tip:
      

      • Removal (Click here)

      • Installation (Click here)

   
   
   • OK

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

   • NG

     REPLACE SPIRAL CABLE SUB-ASSEMBLY (Click here)