Steering Pad Switch Circuit [12/2013 - 11/2016]: Procedure

1. Disconnect the F71 radio and display receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F71-21 (SW1) - F71-23 (SWG)	No switch pushed	95 to 105 kΩ
   	Seek+ switch pushed	Below 2.5 Ω
   	Seek- switch pushed	313 to 345 Ω
   	Volume+ switch pushed	950 to 1050 Ω
   	Volume- switch pushed	2955 to 3265 Ω
   	Up switch pushed	Below 2.5 Ω
   	Down switch pushed	313 to 345 Ω
   F71-22 (SW2) - F71-23 (SWG)	No switch pushed	95 to 105 kΩ
   	MODE/HOLD switch pushed	Below 2.5 Ω
   	On hook switch pushed	313 to 345 Ω
   	Off hook switch pushed	950 to 1050 Ω
   	Voice switch pushed	2955 to 3265 Ω
   F71-24 (SW3) - F71-23 (SWG)	No switch pushed	95 to 105 kΩ
   	Enter switch pushed	Below 2.5 Ω
   	Back switch pushed	313 to 345 Ω
   	Right switch pushed	950 to 1050 Ω
   	Left switch pushed	2955 to 3265 Ω

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2013 - 11/2015]  Refer to  PROBLEM SYMPTOMS TABLE [11/2015 - 11/2016] 

Result:  2

NG 

See step  2

1. Remove the steering pad switch assembly.

   Refer to REMOVAL [12/2013 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Steering Pad Switch Assembly)	*b	Volume+
   *c	Volume-	*d	Seek+
   *e	Seek-	*f	MODE/HOLD
   *g	Off hook	*h	On hook
   *i	Voice	*j	Up
   *k	Down	*l	Left
   *m	Right	*n	Enter
   *o	Back	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   11 (AU1) - 8 (EAU)	No switch pushed	95 to 105 kΩ
   	Seek+ switch pushed	Below 2.5 Ω
   	Seek- switch pushed	313 to 345 Ω
   	Volume+ switch pushed	950 to 1050 Ω
   	Volume- switch pushed	2955 to 3265 Ω
   	Up switch pushed	Below 2.5 Ω
   	Down switch pushed	313 to 345 Ω
   10 (AU2) - 8 (EAU)	No switch pushed	95 to 105 kΩ
   	MODE/HOLD switch pushed	Below 2.5 Ω
   	On hook switch pushed	313 to 345 Ω
   	Off hook switch pushed	950 to 1050 Ω
   	Voice switch pushed	2955 to 3265 Ω
   9 (AU3) - 8 (EAU)	No switch pushed	95 to 105 kΩ
   	Enter switch pushed	Below 2.5 Ω
   	Back switch pushed	313 to 345 Ω
   	Right switch pushed	950 to 1050 Ω
   	Left switch pushed	2955 to 3265 Ω

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

Result:  1

OK 

See step  3

1. Remove the spiral cable sub-assembly.

   Refer to REMOVAL [12/2013 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Spiral Cable Sub-assembly)
   *b	Steering Pad Switch Assembly Side
   *c	Vehicle Side

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z4-8 (EAU) - F61-3 (EAU)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z4-11 (AU1) - F61-6 (AU1)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z4-10 (AU2) - F61-5 (AU2)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z4-9 (AU3) - F61-4 (AU3)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right

3. After setting the spiral cable sub-assembly to the center position, rotate the spiral cable sub-assembly 2.5 times clockwise. Then while rotating the spiral cable sub-assembly 5 times counterclockwise, measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z4-8 (EAU) - F61-3 (EAU)	Always	3 Ω or less
   z4-11 (AU1) - F61-6 (AU1)	Always	3 Ω or less
   z4-10 (AU2) - F61-5 (AU2)	Always	3 Ω or less
   z4-9 (AU3) - F61-4 (AU3)	Always	3 Ω or less

   NOTE:

   • Press and hold the lock located in the center of the spiral cable sub-assembly to rotate the spiral cable sub-assembly.
   • The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying.
   • As the spiral cable sub-assembly may break, do not rotate the spiral cable sub-assembly more than the specified amount.

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY) 

Result:  2

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [12/2013 - ]