Main Switch Circuit [03/2012 - ]: 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: Body Electrical / Blind spot monitor Master / Data list.
5. According to the display on Techstream, read the Data List.
   BLIND SPOT MONITOR MASTER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   BSM Main SW	Blind spot monitor main switch (warning canceling switch assembly) / ON or OFF	ON: Blind spot monitor main switch (warning canceling switch assembly) on OFF: Blind spot monitor main switch (warning canceling switch assembly) off	-

   Result

   Result	Proceed to
   The display does not change as shown above when the blind spot monitor main switch (warning canceling switch assembly) is operated.	A
   The display changes as shown above when the blind spot monitor main switch (warning canceling switch assembly) is operated.	B

B → See step   5 

A: Go to next step 

1. Remove the blind spot monitor main switch (warning canceling switch assembly). Refer to REMOVAL [03/2012 - 07/2012] .
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   6 (B) - 7 (D)	Blind spot monitor main switch assembly is on (not protruding)	Below 1 Ω
   6 (B) - 7 (D)	Blind spot monitor main switch assembly is off (protruding)	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Blind Spot Monitor Main Switch (Warning Canceling Switch Assembly))

NG → See step   6 

OK: Go to next step 

1. Disconnect the F99 blind spot monitor main switch (warning canceling switch assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F99-6 (B) - Body ground	Engine switch on (IG)	11 to 14 V
   F99-6 (B) - Body ground	Engine switch off	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the W3 blind spot monitor sensor LH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W3-8 (BSSW) - F99-7 (D)	Always	Below 1 Ω
   W3-8 (BSSW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7