Millimeter Wave Radar Sensor Power Source Circuit: Procedure

1. Disconnect the millimeter wave radar sensor assembly connector.
   Fig 1: Identifying B9 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   B9-5 (IGB) - Body ground	Engine switch on (IG)	11 to 14 V

4. Reconnect the millimeter wave radar sensor assembly connector.

NG → See step   4 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor assembly connector.
   Fig 2: Identifying B9 And A5 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)
   *2	Front view of wire harness connector (to ECM)
   *3	for 2GR-FSE
   *4	for 4GR-FSE

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

   Standard Resistance (Check for Open)

   FOR 2GR-FSE
   
   

   Tester Connection	Condition	Specified Condition
   A5-9 (LGND) - B9-1 (LGND)	Always	Below 1 Ω

   FOR 4GR-FSE
   
   

   Tester Connection	Condition	Specified Condition
   A5-29 (LGND) - B9-1 (LGND)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   FOR 2GR-FSE
   
   

   Tester Connection	Condition	Specified Condition
   A5-9 (LGND) or B9-1 (LGND) - Body ground	Always	10 kΩ of higher

   FOR 4GR-FSE
   
   

   Tester Connection	Condition	Specified Condition
   A5-29 (LGND) or B9-1 (LGND) - Body ground	Always	10 kΩ of higher

4. Reconnect the millimeter wave radar sensor assembly connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - ECM) 

OK: Go to next step 

1. Disconnect the millimeter wave radar sensor assembly connector.
   Fig 3: Identifying B9 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   B9-2 (SGND) - Body ground	Always	Below 1 Ω

3. Reconnect the millimeter wave radar sensor assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND) 

OK → See step   6 

1. Disconnect the millimeter wave radar sensor assembly connector.
   Fig 4: Identifying J17 And B9 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Distance Control ECU)
   *2	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

2. Disconnect the distance control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   B9-5 (IGB) - J17-13 (IGB)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

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

4. Reconnect the millimeter wave radar sensor assembly connector.
5. Reconnect the distance control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) 

OK → See step   5