Steering Pad Switch Circuit: Procedure

1. Disconnect the H140 multi-media module receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   H140-30 (SW1) - H140-32 (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
   H140-31 (SW2) - H140-32 (SWG)	No switch pushed	95 to 105 kΩ
   	MODE 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

NG → See step   2 

OK → See step   4 

1. Remove the steering pad switch assembly.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Inspecting Steering Pad Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch 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
   10 (AU2) - 8 (EAU)	No switch pushed	95 to 105 kΩ
   	MODE 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

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

OK: Go to next step 

1. Remove the spiral cable with sensor sub-assembly.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying z4 And H30 Connecter Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z4-8 (EAU) - H30-3 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z4-11 (AU1) - H30-6 (AU1)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   z4-10 (AU2) - H30-5 (AU2)	Center	Below 1 Ω
   	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
   z4-8 (EAU) - H30-3 (EAU)	Always	Below 1 Ω
   z4-11 (AU1) - H30-6 (AU1)	Always	Below 1 Ω
   z4-10 (AU2) - H30-5 (AU2)	Always	Below 1 Ω

   NOTE:

   • 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. Refer to the information shown in the brackets.
   • As the spiral cable with sensor sub-assembly may break, do not rotate the spiral cable with sensor with sensor sub-assembly more than the specified amount.
   TEXT IN ILLUSTRATION
   
   

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

NG → See step   5 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)