Blind Spot Monitor Sensor Communication Stop Mode [11/2018 - 12/2021]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the blind spot monitor sensor LH connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q1-2 (CA1P) - Q1-7 (CA1N)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Result

   Result	Proceed to
   OK (w/ Stop and Start System)	A
   OK (w/o Stop and Start System)	B
   NG	C

Result: 

B 

See step  3

Result: 

C 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR 

Result: 

A 

See step  2

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q1-10 (BLGD) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

2. Reconnect the cable to the negative (-) battery terminal.
   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

   Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021]

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   Q1-5 (BLB) - Body ground	Ignition switch ON	10.5 to 16 V
   	Ignition switch off	Below 1 V

   Result

   Result	Proceed to
   OK	A
   NG (BLB terminal)	B
   NG (Other terminal)	C

Result: 

A 

REPLACE BLIND SPOT MONITOR SENSOR LH 

Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 12/2021]

Result: 

B 

GO TO STOP AND START SYSTEM 

Refer to Backup Boost Converter Circuit [11/2018 - 10/2019] , or refer to Backup Boost Converter Circuit [10/2019 - 08/2020] , or refer to Backup Boost Converter Circuit [08/2020 - 12/2021]

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q1-10 (BLGD) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

2. Reconnect the cable to the negative (-) battery terminal.
   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

   Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021]

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   Q1-5 (BLB) - Body ground	Ignition switch ON	11 to 14 V
   	Ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BLIND SPOT MONITOR SENSOR LH 

Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 12/2021]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR