Steering Pad Switch Circuit: Procedure

1. Disconnect the radio receiver assembly connector.
   Fig 1: Radio Receiver Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G9-7 (SW1) - G9-6 (SWG)	No switch pushed	95 to 105 kΩ
   G9-7 (SW1) - G9-6 (SWG)	Seek+ switch pushed	Below 2.5 Ω
   G9-7 (SW1) - G9-6 (SWG)	Seek- switch pushed	312 to 345 Ω
   G9-7 (SW1) - G9-6 (SWG)	Volume+ switch pushed	950 to 1050 Ω
   G9-7 (SW1) - G9-6 (SWG)	Volume- switch pushed	2954 to 3265 Ω
   G9-8 (SW2) - G9-6 (SWG)	No switch pushed	95 to 105 kΩ
   G9-8 (SW2) - G9-6 (SWG)	MODE switch pushed	Below 2.5 Ω
   G9-8 (SW2) - G9-6 (SWG)*2	Voice switch pushed	2954 to 3265 Ω
   G9-8 (SW2) - G9-6 (SWG)*2	On hook switch pushed	312 to 345 Ω
   G9-8 (SW2) - G9-6 (SWG)*2	Off hook switch pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Radio Receiver Assembly)

   • *2: w/ Microphone

NG → See step   2 

OK → See step   4 

1. Disconnect the steering pad switch assembly connector.
2. Measure the resistance according to the values in the table below.
   Fig 2: z5 Connector & Steering Pad Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z5-10 (AU1) - z5-8 (EAU)	No switch pushed	95 to 105 kΩ
   z5-10 (AU1) - z5-8 (EAU)	Seek+ switch pushed	Below 2.5 Ω
   z5-10 (AU1) - z5-8 (EAU)	Seek- switch pushed	312 to 345 Ω
   z5-10 (AU1) - z5-8 (EAU)	Volume+ switch pushed	950 to 1050 Ω
   z5-10 (AU1) - z5-8 (EAU)	Volume- switch pushed	2954 to 3265 Ω
   z5-9 (AU2) - z5-8 (EAU)	No switch pushed	95 to 105 kΩ
   z5-9 (AU2) - z5-8 (EAU)	MODE switch pushed	Below 2.5 Ω
   z5-9 (AU2) - z5-8 (EAU)*10	Voice switch pushed	2954 to 3265 Ω
   z5-9 (AU2) - z5-8 (EAU)*10	On hook switch pushed	312 to 345 Ω
   z5-9 (AU2) - z5-8 (EAU)*10	Off hook switch pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Steering Pad Switch Assembly)	*2	Volume-
   *3	Volume+	*4	Seek-
   *5	Seek+	*6	MODE
   *7	Off hook*10	*8	On hook*10
   *9	Voice*10	-	-

   • *10: w/ Microphone

NG → See step   6 

OK: Go to next step 

1. Disconnect the steering pad switch assembly and spiral with sensor cable sub-assembly connectors.
   Fig 3: Identifying Steering Pad Switch And Spiral With Sensor Cable Sub-Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z5-8 (EAU) - F40-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z5-10 (AU1) - F40-6 (AU1)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z5-9 (AU2) - F40-5 (AU2)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   NOTE:

   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 information shown in the brackets.

   HINT: 

   • Removal. Refer to REMOVAL
   • Installation. Refer to INSTALLATION
   TEXT IN ILLUSTRATION
   
   

   *1	Steering Pad Switch Assembly Side
   *2	Vehicle Side

NG → See step   5 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER ASSEMBLY)