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

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

   Refer to DIAGNOSIS SYSTEM [10/2015 - ]

   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 power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: System Select / Health Check.
5. Check DTCs.
6. Turn the power switch off.

   Result

   Result	Proceed to
   No DTCs are 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 [10/2014 - ]

2. Disconnect the steering pad switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Front view of wire harness connector (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	Condition	Specified Condition
   z9-4 (DIST) - z9-7 (ECC)	Lane departure alert main switch pushed and held	228 to 252 Ω
   	Lane departure alert main switch not pushed	10 kΩ or higher

4. Reconnect the steering pad switch assembly connector.
5. Reinstall the horn button assembly.

   Refer to INSTALLATION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  COMPONENTS [10/2014 - ] 

Result: 

OK 

See step  4

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

   Refer to INSPECTION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY. Refer to  COMPONENTS [10/2014 - ] 

Result: 

OK 

See step  5

1. Disconnect the D20 spiral cable with sensor sub-assembly connector.
2. Disconnect the D120 driving support ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   D20-12 (DIST) - D120-23 (SPSW)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D20-12 (DIST) or D120-23 (SPSW) - Body ground	Always	10 kΩ or higher

4. Reconnect the D120 driving support ECU assembly connector.
5. Reconnect the D20 spiral cable with sensor sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the D20 spiral cable with sensor sub-assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   D20-2 (ECC) - Body ground	Always	Below 1 Ω

3. Reconnect the D20 spiral cable with sensor sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR