PRE-COLLISION SYSTEM ECU Power Source Circuit

DESCRIPTION

This circuit supplies power to the driving support ECU assembly when the engine switch is on (IG).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK DRIVING SUPPORT ECU ASSEMBLY (B VOLTAGE)

   
   
   1. 

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

      Disconnect the I159 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 I159-7 (B) - Body ground Engine switch on (IG) 11 to 14 V*1 10.5 to 16 V*2 *1: w/o Stop and Start System *2: w/ Stop and Start System

   4. Turn the engine switch off.

   5. Reconnect the I159 driving support ECU assembly connector.

      Result
      Proceed to OK NG (w/ Stop and Start System) NG (w/o Stop and Start System)

   
   

   NG (w/ Stop and Start System)

   INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) Click here

   NG (w/o Stop and Start System)

   REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

   OK

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

   
   
   1. 

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

      Disconnect the I159 driving support ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition I159-28 (GND) - Body ground Always Below 1 Ω

   3. Connect the I159 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