Power Source Circuit [12/2019 - 11/2023]: Procedure

1. Disconnect the M43 blind spot monitor sensor LH (master) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   M43-5 (BLB) - Body ground	Ignition switch ON	11 to 14 V*1 10.5 to 16 V*2
   M43-5 (BLB) - Body ground	Ignition switch off	Below 1 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   1. *1: w/o Stop and Start System
   2. *2: w/ Stop and Start System

   Result

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

Result: 

B 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

C 

GO TO STOP AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

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
   M43-10 (BLGD) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the M2 blind spot monitor sensor RH (slave) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   M2-5 (BRB) - Body ground	Ignition switch ON	11 to 14 V
   M2-5 (BRB) - Body ground	Ignition switch off	Below 1 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M2-10 (BRGD) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 10/2022]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR