DTC B2660: Steering Wheel Switch Malfunction [08/2015 - 08/2019]: Procedure

1. Operate the Techstream according to the display and select the Data List (Refer to DATA LIST / ACTIVE TEST [08/2015 - 08/2017] , or refer to DATA LIST / ACTIVE TEST [08/2017 - 08/2019] ).
   D-SEAT SW
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Wheel Menu Switch	MENU switch/OFF or ON	OFF: MENU switch off	-
   		ON: MENU switch on
   Steering Wheel Enter Switch	ENTER switch/OFF or ON	OFF: ENTER switch off	-
   		ON: ENTER switch on
   Steering Wheel Up Switch	UP/DOWN UP switch/OFF or ON	OFF: UP/DOWN UP switch off	-
   		ON: UP/DOWN UP switch on
   Steering Wheel Down Switch	UP/DOWN DOWN switch/OFF or ON	OFF: UP/DOWN DOWN switch off	-
   		ON: UP/DOWN DOWN switch on

   OK

   The value displayed on the Techstream changes with the actual steering pad switch operation.

Result: 

OK 

REPLACE DRIVING SUPPORT SWITCH CONTROL ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

See step  2

1. Remove the steering pad switch assembly (Refer to REMOVAL [08/2015 - 08/2019] ).
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	MENU switch	*2	ENTER switch
   *3	UP/DOWN UP switch	*4	UP/DOWN DOWN switch
   *a	Front view of wire harness connector (to Spiral Cable Sub-assembly)	-	-

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   z8-2 - z8-3	MENU switch pushed	Below 2.5 Ω
   	ENTER switch pushed	313 to 346 Ω
   	UP/DOWN UP switch pushed	2955 to 3266 Ω
   	UP/DOWN DOWN switch pushed	950 to 1050 Ω
   	All switches off	95 to 105 kΩ

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

OK 

See step  3

1. Disconnect the G60 driving support switch control ECU connector.
2. Disconnect the G28 spiral cable connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G28-9 (DISP) - G60-3 (SWI1)	Always	Below 1 Ω
   G28-10 (GND1) - G60-4 (SWI2)	Always	Below 1 Ω
   G28-9 (DISP) - G28-10 (GND1)	Always	10 kΩ or higher
   G28-9 (DISP) - Body ground	Always	10 kΩ or higher
   G28-10 (GND1) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the spiral cable sub-assembly (Refer to REMOVAL [08/2015 - 08/2019] ).
2. Set the spiral cable to the center position (Refer to INSPECTION [08/2015 - 08/2019] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-2 - B-9	Always	Below 1 Ω
   A-3 - B-10	Always	Below 1 Ω
   A-2 - A-3	Always	10 kΩ or higher
   A-2 - Body ground	Always	10 kΩ or higher
   A-3 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Connector A
   *b	Connector B

Result: 

OK 

REPLACE DRIVING SUPPORT SWITCH CONTROL ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )