YH4
GRAND
VITARA
1. Immobilizer Control Module
8G-4 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
IMMOBILIZER CONTROL MODULE
Immobilizer Control Module is installed to the underside of the
instrument panel at the driver’s seat side.
As main functions, Immobilizer Control Module checks matching
not only between the Transponder Code transmitted from the igni-
tion key and that registered in Immobilizer Control Module (Up to
4 different Transponder codes can be registered.) but also between
the ECM/Immobilizer Control Module code transmitted from
ECM/PCM and that registered in Immobilizer Control Module. In
addition, it has an on-board diagnostic system (self-diagnosis func-
tion) which is described in “On-Board Diagnostic System (Self-
Diagnosis Function)” in this section.
ECM/PCM
As main functions, ECM/PCM not only checks matching of ECM/
Immobilizer Control Module code but also has an on-board diag-
nostic system (self-diagnosis function) as described in “On-Board
Diagnostic System (Self-Diagnosis Function)” in this section.
For installation position of ECM/PCM, refer to Section 6E1 or 6E2.
ON-BOARD DIAGNOSTIC SYSTEM
(SELF-DIAGNOSIS FUNCTION)
Immobilizer Control Module and ECM/PCM diagnose troubles
which may occur in the area including the following parts when the
ignition switch is ON.
ECM/ ECM/Immobilizer Immobilizer Transponder code
PCM: Control Module Control Coil antenna
code Module: ECM/Immobilizer
Serial data link Control Module code
circuit Serial data link circuit
ECM/PCM Immobilizer Control
Module
Ignition signal
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