ECU Power Source Circuit [11/2017 - 09/2019]: Procedure

1. Disconnect the millimeter wave radar sensor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M8-8 (IGB) - Body ground	Ignition switch ON	11 to 14 V

4. Turn the ignition switch off.
5. Connect the millimeter wave radar sensor assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Disconnect the millimeter wave radar sensor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	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

   Tester Connection	Condition	Specified Condition
   M8-1 (SGND) - Body ground	Always	Below 1 Ω

3. Connect the millimeter wave radar sensor assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2017 - ] 

Result: 

NG 

See step  3

1. Disconnect the M8 millimeter wave radar sensor assembly connector.
2. Disconnect the EP1 millimeter wave radar wire connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M8-1 (SGND) - EP1-1	Always	Below 1 Ω

4. Connect the M8 millimeter wave radar sensor assembly connector.
5. Connect the EP1 millimeter wave radar wire connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPAIR MILLIMETER WAVE RADAR WIRE. Refer to  REMOVAL [11/2017 - 09/2019] 

1. Disconnect the M8 millimeter wave radar sensor assembly connector.
2. Disconnect the EP1 millimeter wave radar wire connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M8-8 (IGB) - EP1-8	Always	Below 1 Ω
   EP1-8 - EP1-1	Always	10 kΩ or higher

4. Connect the M8 millimeter wave radar assembly connector.
5. Connect the EP1 millimeter wave radar sensor wire connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

NG 

REPAIR MILLIMETER WAVE RADAR WIRE. Refer to  REMOVAL [11/2017 - 09/2019]