Certification ECU Power Source Circuit

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): Certification ECU Power Source Circuit

Certification ECU Power Source Circuit

DESCRIPTION

This is the power source circuit of the certification ECU (smart key ECU assembly).
The certification ECU (smart key ECU assembly) controls the following:

- Key verification confirmation
- Electrical key oscillator (door, indoor and outside) control
- Entry door LOCK/UNLOCK request to the main body ECU (instrument panel junction block)
- Steering LOCK/UNLOCK request
- Immobiliser SET/UNSET request to the ID code box (immobiliser code ECU)

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the certification ECU (smart key ECU assembly) is replaced, register the key and ECU communication ID Engine Immobiliser System (W/ Smart Key System).

PROCEDURE

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




(a) Disconnect the certification ECU (smart key ECU assembly) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BODY GROUND)




(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE