Inspection Procedure

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

   Standard voltage 

   STANDARD VOLTAGE
   
   

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

NG :  Go to step  3

Fig 1: Checking Distance Control ECU (IGB Voltage)

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 

   STANDARD RESISTANCE
   
   

   Tester Connection	Specified Condition
   A6-16 (LGND)*1 - B8-1 (LGND)	Below 1 Ω
   A6-9 (LGND)*2 - B8-1 (LGND)	Below 1 Ω
   B8-1 (LGND) - Body ground	10 kΩ or higher
   B8-2 (SGND) - Body ground	Below 1 Ω
   HINT: *1: for 1UR-FSE *2: for 2GR-FSE

NG : REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

Fig 2: Checking Wire Harness (Millimeter Wave Radar Sensor - ECM And Body Ground)

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 

   STANDARD RESISTANCE
   
   

   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 3: Checking Wire Harness (Millimeter Wave Radar Sensor - Distance Control ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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