Steering Pad Switch Circuit: Procedure

1. Remove the steering pad switch assembly. Refer to REMOVAL .
   Fig 1: Inspecting Steering Pad Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Volume+ Switch	*2	Volume- Switch
   *3	Seek+ Switch	*4	Seek- Switch
   *5	MODE Switch	-	-

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   Tester Connection	Switch Condition	Specified Condition
   10 (AU1) - 8 (EAU)	No switch is pushed	95 to 105 kΩ
   	Seek+ switch is pushed	Below 2.5 Ω
   	Seek- switch is pushed	312.5 to 345.5 Ω
   	Volume+ switch is pushed	950 to 1050 Ω
   	Volume- switch is pushed	2954.5 to 3265.5 Ω
   9 (AU2) - 8 (EAU)	No switch is pushed	95 to 105 kΩ
   	MODE switch is pushed	Below 2.5 Ω

NG → See step   5 

OK: Go to next step 

1. Remove the spiral cable sub-assembly. Refer to REMOVAL .
   Fig 2: Inspecting Spiral Cable Sub-Assembly

   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
   8 (EAU) - 4 (EAU)	Spiral cable is turned 2.5 rotations counterclockwise	Below 1 Ω
   	Spiral cable is centered
   	Spiral cable is turned 2.5 rotations clockwise
   10 (AU1) - 6 (AU1)	Spiral cable is turned 2.5 rotations counterclockwise
   	Spiral cable is centered
   	Spiral cable is turned 2.5 rotations clockwise
   9 (AU2) - 5 (AU2)	Spiral cable is turned 2.5 rotations counterclockwise
   	Spiral cable is centered
   	Spiral cable is turned 2.5 rotations clockwise

   TEXT IN ILLUSTRATION
   
   

   *a	Steering Pad Switch Side
   *b	Vehicle Side

   WARNING:

   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 Precaution for the SRS. Refer to PRECAUTION .

NG → See step   6 

OK: Go to next step 

1. Disconnect the E109 radio receiver assembly connector.
2. Disconnect the E7 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
   E109-21 (SW1) - E7-6 (AU1)	Always	Below 1 Ω
   E109-22 (SW2) - E7-5 (AU2)
   E109-23 (SWG) - E7-4 (EAU)
   E109-21 (SW1) - Body ground	Always	10 kΩ or higher
   E109-22 (SW2) - Body ground
   E109-23 (SWG) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4