Inspection Procedure

1. Disconnect the B9 sensor connector.
2. Disconnect the A33 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   FRONT MILLIMETER WAVE RADAR SENSOR DRIVING SUPPORT ECU
   
   

   Tester Connection	Condition	Specified Condition
   B9-2 (SGND) - A33-26 (SGND)	Always	Below 1 Ω
   B9-5 (IGB) - A33-36 (IGB)	Always	Below 1 Ω
   B9-2 (SGND) - Body ground	Always	10 kΩ or higher
   B9-5 (IGB) - Body ground	Always	10 kΩ or higher

   Fig 1: Identifying B9 Sensor And A33 ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

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

   Standard voltage 

   DRIVING SUPPORT ECU (IGB VOLTAGE SIGNAL)
   
   

   Tester Connection	Switch Condition	Specified Condition
   B9-S (IGB) - B9-2 (SGND)	Engine switch on (IG)	11 to 14 V

   Fig 2: Identifying B9 Millimeter Wave Radar Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE DRIVING SUPPORT ECU (See  REMOVAL   ) 

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