Steering Pad Switch Circuit (To 8/2009): Procedure

1. Disconnect the display and navigation module display connector.
   Fig 1: Identifying G4 Connector

   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
   G4-25 (SW1) - G4-23 (SWG)	No switch is pushed	95 to 105 kΩ
   G4-25 (SW1) - G4-23 (SWG)	Seek+ switch: pushed	Below 2.5 Ω
   G4-25 (SW1) - G4-23 (SWG)	Seek- switch: pushed	312 to 345 Ω
   G4-25 (SW1) - G4-23 (SWG)	Volume+ switch: pushed	950 to 1050 Ω
   G4-25 (SW1) - G4-23 (SWG)	Volume- switch: pushed	2954 to 3265 Ω
   G4-24 (SW2) - G4-23 (SWG)	No switch is pushed	95 to 105 kΩ
   G4-24 (SW2) - G4-23 (SWG)	MODE switch: pushed	Below 2.5 Ω
   G4-24 (SW2) - G4-23 (SWG)	Voice switch: pushed	2954 to 3265 Ω
   G4-24 (SW2) - G4-23 (SWG)	On Hook switch: pushed	312 to 345 Ω
   G4-24 (SW2) - G4-23 (SWG)	Off Hook switch: pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   3 

OK → See step   2 

1. Disconnect the steering pad switch and spiral with sensor cable sub-assembly connectors.
   Fig 2: Identifying Steering Pad Switch And Spiral With Sensor Cable Sub-Assembly Connectors

   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 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 articles shown in the brackets.

   HINT: 

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

   *1	Component without harness connected (Spiral with Sensor Cable Sub-assembly)
   *2	Steering Pad Switch Side
   *3	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 Connector

   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
   z5-10 (AU1) - z5-8 (EAU)	No switch is 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 is pushed	95 to 105 kΩ
   z5-9 (AU2) - z5-8 (EAU)	MODE switch: pushed	Below 2.5 Ω
   z5-9 (AU2) - z5-8 (EAU)	Voice switch: pushed	2954 to 3265 Ω
   z5-9 (AU2) - z5-8 (EAU)	On Hook switch: pushed	312 to 345 Ω
   z5-9 (AU2) - z5-8 (EAU)	Off Hook switch: pushed	950 to 1050 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

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