ENGINE IMMOBILISER SYSTEM (w/ Entry and Start System) > Certification ECU Power Source Circuit

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DESCRIPTION

This is the power source circuit of the certification ECU.
The certification ECU controls the following:
  1. Key verification confirmation
  2. Indoor, outside and door oscillator control
  3. Entry LOCK/UNLOCK request to the main body ECU
  4. Steering LOCK/UNLOCK request
  5. Immobiliser SET/UNSET request to the ID code box

WIRING DIAGRAM


B216012E02


INSPECTION PROCEDURE

NOTICE:
  1. If the certification ECU is replaced, register the key.
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)


    B199585E01

  1. Disconnect the certification ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D34-1 (+B) - Body ground
    		Always
    		11 to 14 V
    D34-16 (IG) - Body ground
    		Engine switch off
    		Below 1 V
    D34-16 (IG) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    D34-17 (CUTB) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-15 (E) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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