Millimeter Wave Radar Sensor Power Source Circuit: Wiring Diagram

1. Disconnect the B8 sensor connector.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   B8-5 (IGB) - Body ground	Engine switch on (IG)	10 to 16 V

NG : Go to step   3 

Fig 2: Identifying Distance Control ECU (IGB Voltage) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Disconnect the B8 sensor connector.
2. Disconnect the A6 ECM connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   A6-29 (LGND) - B8-1 (LGND)	Below 1 Ω
   B8-1 (LGND) - Body ground	10 kΩ or higher
   B8-2 (SGND) - Body ground	Below 1 Ω

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

Fig 3: Identifying B8 Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

1. Disconnect the B8 sensor connector.
2. Disconnect the K13 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   B8-5 (IGB) - K13-13 (IGB)	Below 1 Ω
   K13-13 (IGB) - Body ground	10 kΩ or higher

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

Fig 4: Identifying K13 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE