Steering Pad Switch Circuit: Procedure

1. Disconnect the display and navigation module display connector.
   Fig 1: Identifying J100 Connector End View

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   J100-25 (SW1) - J100-23 (SWG)	No switch pushed	95 to 105 kΩ
   J100-25 (SW1) - J100-23 (SWG)	Seek+ switch pushed	Below 2.5 Ω
   J100-25 (SW1) - J100-23 (SWG)	Seek- switch pushed	312 to 345 Ω
   J100-25 (SW1) - J100-23 (SWG)	Volume+ switch pushed	950 to 1050 Ω
   J100-25 (SW1) - J100-23 (SWG)	Volume- switch pushed	2954 to 3265 Ω
   J100-24 (SW2) - J100-23 (SWG)	No switch pushed	95 to 105 kΩ
   J100-24 (SW2) - J100-23 (SWG)	MODE switch pushed	Below 2.5 Ω
   J100-24 (SW2) - J100-23 (SWG)	Voice switch pushed	2954 to 3265 Ω
   J100-24 (SW2) - J100-23 (SWG)	On Hook switch pushed	312 to 345 Ω
   J100-24 (SW2) - J100-23 (SWG)	Off Hook switch pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Display and Navigation Module Display)

NG → See step   2 

OK → See step   4 

1. Disconnect the steering pad switch assembly connector.
   Fig 2: Identifying Spiral Cable Sub-Assembly Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the spiral cable sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   k1-8 (EAU) - J24-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   k1-10 (AU1) - J24-6 (AU1)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   k1-9 (AU2) - J24-5 (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. Refer to service 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 Side
   *c	Vehicle Side

NG → See step   5 

OK: Go to next step 

1. Disconnect the steering pad switch assembly connector.
   Fig 3: Steering Pad Switch Assembly Wiring Diagram

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   k1-10 (AU1) - k1-8 (EAU)	No switch pushed	95 to 105 kΩ
   k1-10 (AU1) - k1-8 (EAU)	Seek+ switch pushed	Below 2.5 Ω
   k1-10 (AU1) - k1-8 (EAU)	Seek- switch pushed	312 to 345 Ω
   k1-10 (AU1) - k1-8 (EAU)	Volume+ switch pushed	950 to 1050 Ω
   k1-10 (AU1) - k1-8 (EAU)	Volume- switch pushed	2954 to 3265 Ω
   k1-9 (AU2) - k1-8 (EAU)	No switch pushed	95 to 105 kΩ
   k1-9 (AU2) - k1-8 (EAU)	MODE switch pushed	Below 2.5 Ω
   k1-9 (AU2) - k1-8 (EAU)	Voice switch pushed	2954 to 3265 Ω
   k1-9 (AU2) - k1-8 (EAU)	On Hook switch pushed	312 to 345 Ω
   k1-9 (AU2) - k1-8 (EAU)	Off Hook switch pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - SPIRAL CABLE SUB-ASSEMBLY)