Steering Pad Switch Circuit [11/2015 - 06/2017]: Procedure

1. Disconnect the G78 navigation receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G78-21 (SW1) - Body ground	No switch pushed	95 to 105 kΩ
   	Seek+ switch pushed	Below 2.5 Ω
   	Seek- switch pushed	323 to 335 Ω
   	Volume+ switch pushed	980 to 1020 Ω
   	Volume- switch pushed	3048 to 3172 Ω
   G78-22 (SW2) - Body ground	No switch pushed	95 to 105 kΩ
   	MODE switch pushed	Below 2.5 Ω
   	On hook switch pushed	323 to 335 Ω
   	Off hook switch pushed	980 to 1020 Ω
   	Voice switch pushed	3048 to 3172 Ω

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Refer to PROBLEM SYMPTOMS TABLE [11/2015 - ] )

Result: 

NG 

See step  2

1. Remove the steering pad switch LH (Refer to REMOVAL [11/2015 - 06/2017] ).
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (AU1) - 5 (EAU)	No switch pushed	95 to 105 kΩ
   	Seek+ switch pushed	Below 2.5 Ω
   	Seek- switch pushed	323 to 335 Ω
   	Volume+ switch pushed	980 to 1020 Ω
   	Volume- switch pushed	3048 to 3172 Ω
   4 (AU2) - 5 (EAU)	No switch pushed	95 to 105 kΩ
   	MODE switch pushed	Below 2.5 Ω
   	On hook switch pushed	323 to 335 Ω
   	Off hook switch pushed	980 to 1020 Ω
   	Voice switch pushed	3048 to 3172 Ω

Result: 

NG 

REPLACE STEERING PAD SWITCH LH 

Refer to REMOVAL [11/2015 - 06/2017] )

Result: 

OK 

See step  3

1. Remove the steering pad switch RH (Refer to REMOVAL [11/2015 - 06/2017] ).
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Steering Pad Switch RH)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   SR2-3 (AU1) - z2-10 (AU1)	Always	Below 1 Ω
   SR2-5 (EAU) - z2-8 (EAU)	Always	Below 1 Ω
   SR2-4 (AU2) - z2-9 (AU2)	Always	Below 1 Ω

Result: 

NG 

REPLACE STEERING PAD SWITCH RH 

Refer to REMOVAL [11/2015 - 06/2017] )

Result: 

OK 

See step  4

1. Remove the spiral cable with sensor sub-assembly (Refer to REMOVAL [11/2015 - ] ).
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z2-8 (EAU) - G5-4 (EAU)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-10 (AU1) - G5-6 (AU1)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z2-9 (AU2) - G5-5 (AU2)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z2-8 (EAU) - G5-4 (EAU)	Always	3 Ω or less
   z2-10 (AU1) - G5-6 (AU1)	Always	3 Ω or less
   z2-9 (AU2) - G5-5 (AU2)	Always	3 Ω or less

   NOTE:

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

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - NAVIGATION RECEIVER ASSEMBLY, BODY GROUND) 

Result: 

NG 

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY 

Refer to REMOVAL [11/2015 - ] )