Pre-collision System Circuit [11/2015 - ]: Procedure

1. Measure the auxiliary battery voltage with the power switch off.

   Standard voltage

   11 to 14 V

2. Using the parts location and system diagram, check the system for blown-out fuses, open or short circuits in the wire harness(es) and connectors that are not properly connected by performing a visual check.

   HINT: 

   If the voltage is 11 V or less, replace or recharge the auxiliary battery before proceeding to the next step.

NEXT 

See step  2

1. Check pre-collision city sensor. (w/o Sliding Roof)
   NOTE:

   DTCs may be output when connectors are disconnected during inspection. Therefore, make sure to clear the DTCs using the Techstream once the inspection has been completed.

   1. Disconnect the Q7 pre-collision city sensor connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      TEXT IN ILLUSTRATION
      
      

      *a	Front view of wire harness connector (to Pre-collision City Sensor)

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

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      Q7-7 (IG1) - Body ground	Power switch is on (IG)	11 to 14 V
      Q7-7 (IG1) - Body ground	Power switch off	Below 1 V

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Q7-10 (GND) - Body ground	Always	Below 1 Ω

   4. Connect the Q7 pre-collision city sensor connector.
2. Check pre-collision city sensor. (w/ Sliding Roof)
   NOTE:

   DTCs may be output when connectors are disconnected during inspection. Therefore, make sure to clear the DTCs using the Techstream once the inspection has been completed.

   1. Disconnect the Q8 pre-collision city sensor connector.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      TEXT IN ILLUSTRATION
      
      

      *a	Front view of wire harness connector (to Pre-collision City Sensor)

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

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      Q8-7 (IG1) - Body ground	Power switch is on (IG)	11 to 14 V
      Q8-7 (IG1) - Body ground	Power switch off	Below 1 V

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Q8-10 (GND) - Body ground	Always	Below 1 Ω

   4. Connect the Q8 pre-collision city sensor connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Use the Techstream to check if the CAN communication system is functioning normally (Refer to DIAGNOSIS SYSTEM [11/2015 - 06/2017] Refer to DIAGNOSIS SYSTEM [06/2017 - ] ).
   RESULT
   
   

   Result	Proceed to
   CAN communication system DTCs are not output	A
   CAN communication system DTCs are output	B

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Refer to PROBLEM SYMPTOMS TABLE [11/2015 - 06/2017] Refer to PROBLEM SYMPTOMS TABLE [06/2017 - ] )

Result: 

B 

REFER TO CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )