Steering Pad Switch Circuit: Procedure

1. Disconnect the E5 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
   E5-21 (SW1) - E5-23 (SWG)	No switch pushed	95 to 105 kΩ
   	Up switch pushed	Below 2.5 Ω
   	Down switch pushed	313 to 345 Ω
   	Volume+ switch pushed	950 to 1050 Ω
   	Volume- switch pushed	2955 to 3265 Ω
   E5-22 (SW2) - E5-23 (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
   E5-24 (SW3) - E5-23 (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

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: Measuring Resistance Of Steering Pad Switch Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   11 (AU1) - 8 (EAU)	No switch pushed	95 to 105 kΩ
   	Up switch pushed	Below 2.5 Ω
   	Down 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/HOLD switch pushed	Below 2.5 Ω
   	On hook switch pushed	313 to 345 Ω
   	Off hook switch pushed	950 to 1050 Ω
   9 (SW3) - 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

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Steering Pad Switch Assembly)	*b	Volume+
   *c	Volume-	*d	Back
   *e	MODE/HOLD	*f	Up
   *g	Down	*h	Left
   *i	Right	*j	Enter
   *k	Off hook	*l	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: Measuring Resistance Of Spiral Cable With Sensor Sub-Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z9-8 (EAU) - D20-3 (EAU)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z9-11 (AU1) - D20-6 (AU1)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z9-10 (AU2) - D20-5 (AU2)	Center	3 Ω or less
   	2.5 rotations to the left
   	2.5 rotations to the right
   z9-9 (SW3) - D20-4 (SW3)	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 as shown in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z9-8 (EAU) - D20-3 (EAU)	Always	3 Ω or less
   z9-11 (AU1) - D20-6 (AU1)	Always	3 Ω or less
   z9-10 (AU2) - D20-5 (AU2)	Always	3 Ω or less
   z9-9 (SW3) - D20-4 (SW3)	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.
   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 (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY)