Millimeter Wave Radar Sensor Power Source Circuit: Procedure

Fig 1: Identifying Millimeter Wave Radar Sensor Wire Harness Side Connector Front View

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1. Disconnect the B9 sensor connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   B9-5 (IGB) - Body ground	Engine switch on (IG)	10 to 14 V

NG → See step   3 

OK: Go to next step 

Fig 2: Identifying B9 Sensor Connector And A5 ECM Connector

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1. Disconnect the B9 sensor connector.
2. Disconnect the A5 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   A5-9 (LGND) - B9-1 (LGND)(*1) A5-29 (LGND) - B9-1 (LGND)(*2)	Below 1 Ω
   B9-1 (LGND) - Body ground	10 kΩ or higher
   B9-2 (SGND) - Body ground	Below 1 Ω

   HINT: 

   *1: 2GR-FSE

   *2: 4GR-FSE

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Fig 3: Identifying J17 ECU Connector And B9 Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the B9 sensor connector.
2. Disconnect the J17 ECU connector.
3. Measure the resistance according to the value(s) in the table below

   Standard resistance

   Tester Connection	Specified Condition
   B9-5 (IGB) - J17-13 (IGB)	Below 1 Ω
   J17-13 (IGB) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE