DYNAMIC RADAR CRUISE CONTROL SYSTEM ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the driving support ECU assembly. The driving support ECU assembly determines information about the vehicle in front based on data from the radar sensor, and then decides how much acceleration and/or deceleration is needed to maintain the set vehicle-to-vehicle distance. The driving support ECU assembly also requests to apply braking.

WIRING DIAGRAM

*1	from IG1 NO. 3 Relay
*2	IG1 NO. 3
*3	Driving Support ECU Assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK DRIVING SUPPORT ECU ASSEMBLY (B VOLTAGE)

   
   
   1. 

      *a	Front view of wire harness connector (to Driving Support ECU Assembly)

      Disconnect the F84 driving support ECU assembly connector.

   2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition F84-30 (B) - Body ground Engine switch on (IG) 11 to 14 V

   4. Turn the engine switch off.

   5. Reconnect the F84 driving support ECU assembly connector.

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE POWER SOURCE CIRCUIT

   OK

2. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)

   
   

   1. Disconnect the F84 driving support ECU assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition F84-25 (GND) - Body ground Always Below 1 Ω

   3. Reconnect the F84 driving support ECU assembly connector.

      Result
      Proceed to OK NG

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)