Steering Pad Switch Circuit: Procedure

1. Disconnect the display and navigation module display connector.
   Fig 1: J50 Connector Terminal Identification

   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
   J50-25 (SW1) - J50-23 (SWG)	No switch pushed	95 to 105 kΩ
   J50-25 (SW1) - J50-23 (SWG)	Seek+ switch pushed	Below 2.5 Ω
   J50-25 (SW1) - J50-23 (SWG)	Seek- switch pushed	312 to 345 Ω
   J50-25 (SW1) - J50-23 (SWG)	Volume+ switch pushed	950 to 1050 Ω
   J50-25 (SW1) - J50-23 (SWG)	Volume- switch pushed	2954 to 3265 Ω
   J50-24 (SW2) - J50-23 (SWG)	No switch pushed	95 to 105 kΩ
   J50-24 (SW2) - J50-23 (SWG)	MODE switch pushed	Below 2.5 Ω
   J50-24 (SW2) - J50-23 (SWG)	Voice switch pushed	2954 to 3265 Ω
   J50-24 (SW2) - J50-23 (SWG)	On Hook switch pushed	312 to 345 Ω
   J50-24 (SW2) - J50-23 (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.
2. Disconnect the spiral cable sub-assembly connector.
   Fig 2: J25 & z2 Connector Terminal Identification

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

   Tester Connection	Condition	Specified Condition
   z2-8 - J24-4	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-10 - J24-6	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-9 - J24-5	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.

   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: Identifying Steering Pad Switch Assembly

   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
   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)	Voice switch pushed	2954 to 3265 Ω
   z2-9 (AU2) - z2-8 (EAU)	On Hook switch pushed	312 to 345 Ω
   z2-9 (AU2) - z2-8 (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)