Steering Pad Switch Circuit: Procedure

1. Disconnect the radio receiver assembly connector.
   Fig 1: Inspecting Radio Receiver Assembly E32 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
   E32-7 (SW1) - E32-6 (SWG)	No switch pushed	95 to 105 kΩ
   E32-7 (SW1) - E32-6 (SWG)	Seek+ switch pushed	Below 2.5 Ω
   E32-7 (SW1) - E32-6 (SWG)	Seek- switch pushed	313 to 345 Ω
   E32-7 (SW1) - E32-6 (SWG)	Volume+ switch pushed	950 to 1050 Ω
   E32-7 (SW1) - E32-6 (SWG)	Volume- switch pushed	2955 to 3265 Ω
   E32-8 (SW2) - E32-6 (SWG)	No switch pushed	95 to 105 kΩ
   E32-8 (SW2) - E32-6 (SWG)	MODE switch pushed	Below 2.5 Ω
   E32-8 (SW2) - E32-6 (SWG)*1	Voice switch pushed	2955 to 3265 Ω
   E32-8 (SW2) - E32-6 (SWG)*1	On hook switch pushed	313 to 345 Ω
   E32-8 (SW2) - E32-6 (SWG)*1	Off hook switch pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

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

   • *1: w/ Telephone Microphone Assembly

NG → See step   3 

OK → See step   2 

1. Disconnect the steering pad switch assembly*1 or steering pad switch LH*2 connectors.
   • *1: w/ Telephone Microphone Assembly
   • *2: w/o Telephone Microphone Assembly
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Inspecting Steering Pad Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Y1-10 (AU1) - Y1-8 (EAU)	No switch pushed	95 to 105 kΩ
   Y1-10 (AU1) - Y1-8 (EAU)	Seek+ switch pushed	Below 2.5 Ω
   Y1-10 (AU1) - Y1-8 (EAU)	Seek- switch pushed	313 to 345 Ω
   Y1-10 (AU1) - Y1-8 (EAU)	Volume+ switch pushed	950 to 1050 Ω
   Y1-10 (AU1) - Y1-8 (EAU)	Volume- switch pushed	2955 to 3265 Ω
   Y1-9 (AU2) - Y1-8 (EAU)	No switch pushed	95 to 105 kΩ
   Y1-9 (AU2) - Y1-8 (EAU)	MODE switch pushed	Below 2.5 Ω
   Y1-9 (AU2) - Y1-8 (EAU)*1	Voice switch pushed	2955 to 3265 Ω
   Y1-9 (AU2) - Y1-8 (EAU)*1	On hook switch pushed	313 to 345 Ω
   Y1-9 (AU2) - Y1-8 (EAU)*1	Off hook switch pushed	950 to 1050 Ω

   • *1: w/ Telephone Microphone Assembly
   TEXT IN ILLUSTRATION
   
   

   *A	w/ Telephone Microphone Assembly	*B	w/o Telephone Microphone Assembly
   *a	Component without harness connected (Steering Pad Switch Assembly)	*b	Component without harness connected (Steering Pad Switch LH)
   *c	Volume+	*d	Volume-
   *e	MODE	*f	Seek+
   *g	Seek-	*h	On hook
   *i	Off hook	*j	Voice

NG → See step   6 

OK: Go to next step 

1. Disconnect the steering pad switch assembly and spiral cable sub-assembly connectors.
   Fig 3: Inspecting Spiral 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
   Y1-8 (EAU) - E10-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   Y1-10 (AU1) - E10-6 (AU1)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   Y1-9 (AU2) - E10-5 (AU2)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   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. Be sure to read the information shown in the brackets.

   HINT: 

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

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

NG → See step   5 

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