Steering Pad Switch Circuit [10/2015 - 09/2017]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: System Select / CAN Bus Check.

   Refer to DIAGNOSIS SYSTEM [10/2015 - 09/2016] , or refer to DIAGNOSIS SYSTEM [09/2016 - 09/2017]

   CAN Bus Check 

   Result

   Result	Proceed to
   All of the ECUs and sensors that are currently connected to the CAN communication system are displayed	A
   None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] 

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: System Select / Health Check.
5. Check DTCs.
6. Turn the engine switch off.

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

B 

GO TO DTC CHART 

Result: 

A 

See step  3

1. Remove the horn button assembly.

   Refer to REMOVAL [10/2015 - 09/2017]

2. Disconnect the steering pad switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Steering Pad Switch Assembly)

   *b

   Lane Departure Alert Main Switch

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   z4-4 (DIST) - z4-7 (ECC)	Lane departure alert main switch pushed and held	228 to 252 Ω
   	Lane departure alert main switch not pushed	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [10/2015 - 09/2017] 

Result: 

OK 

See step  4

1. Inspect the spiral cable with sensor sub-assembly.

   Refer to INSPECTION [10/2015 - 09/2017]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY. Refer to  REMOVAL [10/2015 - 09/2017] 

Result: 

OK 

See step  5

1. Disconnect the K26 spiral cable with sensor sub-assembly connector.
2. Disconnect the K4 driving support ECU assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K26-12 (DIST) - K4-23 (SPSW)	Always	Below 1 Ω
   K26-12 (DIST) or K4-23 (SPSW) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the K26 spiral cable with sensor sub-assembly connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K26-2 (ECC) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - 09/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR