Steering Pad Switch Circuit: Procedure

1. Disconnect the radio receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E3-7 (SW1) - E3-6 (SWG)	No switch pushed	95 to 105 kΩ
   E3-7 (SW1) - E3-6 (SWG)	Seek+ switch pushed	Below 2.5 Ω
   E3-7 (SW1) - E3-6 (SWG)	Seek- switch pushed	312 to 345 Ω
   E3-7 (SW1) - E3-6 (SWG)	Volume+ switch pushed	950 to 1050 Ω
   E3-7 (SW1) - E3-6 (SWG)	Volume- switch pushed	2954 to 3265 Ω
   E3-8 (SW2) - E3-6 (SWG)	No switch pushed	95 to 105 kΩ
   E3-8 (SW2) - E3-6 (SWG)	MODE switch pushed	Below 2.5 Ω
   E3-8 (SW2) - E3-6 (SWG)*1	Voice switch pushed	2954 to 3265 Ω
   E3-8 (SW2) - E3-6 (SWG)*1	On hook switch pushed	312 to 345 Ω
   E3-8 (SW2) - E3-6 (SWG)*1	Off hook switch pushed	950 to 1050 Ω

   • *1: w/ Telephone Microphone Assembly

NG → See step   3 

OK → See step   2 

1. Disconnect the steering pad switch assembly connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Steering Pad Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z2-10 (AU1) - z2-8 (EAU)	No switch pushed	95 to 105 kΩ
   z2-10 (AU1) - z2-8 (EAU)	Seek+ switch pushed	Below 2.5 Ω
   z2-10 (AU1) - z2-8 (EAU)	Seek- switch pushed	312 to 345 Ω
   z2-10 (AU1) - z2-8 (EAU)	Volume+ switch pushed	950 to 1050 Ω
   z2-10 (AU1) - z2-8 (EAU)	Volume- switch pushed	2954 to 3265 Ω
   z2-9 (AU2) - z2-8 (EAU)	No switch pushed	95 to 105 kΩ
   z2-9 (AU2) - z2-8 (EAU)	MODE switch pushed	Below 2.5 Ω
   z2-9 (AU2) - z2-8 (EAU)*1	Voice switch pushed	2954 to 3265 Ω
   z2-9 (AU2) - z2-8 (EAU)*1	On hook switch pushed	312 to 345 Ω
   z2-9 (AU2) - z2-8 (EAU)*1	Off hook switch pushed	950 to 1050 Ω

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

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

NG → See step   6 

OK: Go to next step 

1. Disconnect the steering pad switch assembly and spiral cable connectors.
   Fig 2: Checking Spiral Cable Resistance

   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
   z2-8 (EAU) - D16-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-10 (AU1) - D16-6 (AU1)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-9 (AU2) - D16-5 (AU2)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   NOTE:

   The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable 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)
   *b	Steering Pad Switch Assembly Side
   *c	Vehicle Side

NG → See step   5 

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