Main Switch Circuit [10/2014 - ]: Procedure

1. Check that the blind spot monitor indicator on the blind spot monitor main switch (combination switch assembly) illuminates normally when the blind spot monitor main switch (combination switch assembly) is turned from off to on.
2. Check that the blind spot monitor indicator on the blind spot monitor main switch (combination switch assembly) turns off normally when the blind spot monitor main switch (combination switch assembly) is turned from on to off.

   OK

   The blind spot monitor indicator operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2014 - 09/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2017 - ] 

Result: 

NG 

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: Body Electrical / Blind Spot Monitor Master / Data List.
5. According to the display on Techstream, read the Data List.

   Refer to DATA LIST / ACTIVE TEST [10/2014 - 09/2017] , or refer to DATA LIST / ACTIVE TEST [09/2017 - ]

   Body Electrical > Blind Spot Monitor Master > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Main Switch	State of the blind spot monitor main switch (combination switch assembly)	OFF or ON	OFF: Blind spot monitor main switch (combination switch assembly) off ON: Blind spot monitor main switch (combination switch assembly) on	-
   Main Switch Indicator Status	State of the blind spot monitor indicator on the blind spot monitor main switch (combination switch assembly)	OFF or ON	OFF: Indicator not illuminated ON: Indicator illuminated	-

   Body Electrical > Blind Spot Monitor Master > Data List 

   Tester Display
   Main Switch
   Main Switch Indicator Status

   Result

   Result	Proceed to
   The status of "Main Switch" and "Main Switch Indicator Status" change as shown above when the blind spot monitor main switch (combination switch assembly) is operated.	A
   The status of "Main Switch" does not change as shown above when the blind spot monitor main switch (combination switch assembly) is operated.	B
   The status of "Main Switch Indicator Status" changes as shown above when the blind spot monitor main switch (combination switch assembly) is operated.	C

Result: 

A 

REPLACE BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

C 

See step  6

Result: 

B 

See step  3

1. Disconnect the blind spot monitor main switch (combination switch assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Blind Spot Monitor Main Switch [Combination Switch Assembly])

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I33-5 (B) - Body ground	Engine switch on (IG)	11 to 14 V
   I33-5 (B) - Body ground	Engine switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the blind spot monitor main switch (combination switch assembly).

   Refer to REMOVAL [10/2014 - ]

2. Inspect the blind spot monitor main switch (combination switch assembly).

   Refer to INSPECTION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  5

1. Disconnect the V1 blind spot monitor sensor LH connector.
2. Disconnect the I33 blind spot monitor main switch (combination switch assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   V1-8 (BSSW) - I33-15 (D)	Always	Below 1 Ω
   V1-8 (BSSW) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [10/2014 - 09/2017]  , or refer to  REMOVAL [09/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the blind spot monitor main switch (combination switch assembly).

   Refer to REMOVAL [10/2014 - ]

2. Inspect the blind spot monitor main switch (combination switch assembly).

   Refer to INSPECTION [10/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BLIND SPOT MONITOR MAIN SWITCH (COMBINATION SWITCH ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  7

1. Disconnect the V1 blind spot monitor sensor LH connector.
2. Disconnect the I33 blind spot monitor main switch (combination switch assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   V1-3 (BIND) - I33-11 (E)	Always	Below 1 Ω
   V1-3 (BIND) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [10/2014 - 09/2017]  , or refer to  REMOVAL [09/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR