IGNITION SWITCH
TSB Revision
CHASSIS ELECTRICAL
54A-7
IGNITION SWITCH
GENERAL DESCRIPTION
M1543009901014
.
Ignition key reminder tone alarm
The ignition key reminder tone alarm will sound
under the following condition, and warn the driver to
remove the ignition key.
• The driver's door is opened when the ignition
switch is at "LOCK" (OFF) or "ACC" position with-
out removing the ignition key.
However, the light reminder tone alarm will take pre-
cedence over this function.
.
Immobilizer system
The immobilizer system consists of the ignition key,
the key ring antenna, the immobilizer-ECU, and the
PCM. The ignition key has a built-in transponder. The
key ring antenna is installed on the steering lock key
cylinder. Only the registered ignition key permits the
engine to start, therefore, the engine can never be
started by means of a forged key or by connecting
the ignition wiring directly. The system is significantly
safe and reliable against theft. In addition, the driver
has only to turn the ignition switch to the "ON" posi-
tion to activate the immobilizer system. If the require-
ments for starting the engine are not satisfied, the
engine will be immobilized. If the ignition key is lost
or another ignition key is added, the encrypted code
can be registered or erased by using scan tool.
IGNITION KEY REMINDER TORN ALARM DIAGNOSIS
M1543000700678
The Ignition key reminder tone alarms is controlled
by the Simplified Wiring System (SWS). For trouble-
shooting, refer to GROUP 54B, SWS Diagnosis
P.54Bb-2
.
IMMOBILIZER SYSTEM DIAGNOSIS
INTRODUCTION TO IMMOBILIZER SYSTEM DIAGNOSIS
M1543009901025
CAUTION
The encrypted code should always be re-regis-
tered when replacing the immobilizer-ECU.
The immobilizer system consists of the immobilizer-
ECU, PCM, ignition key and ignition key ring
antenna. If the engine cannot be started by using a
registered ignition key, one of these components
may be defective. If the immobilizer system has
immobilized the engine, MFI system DTC P1610 will
be output. In this case, observe the immobilizer sys-
tem troubleshooting.
IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1543006900539
Use the following steps to plan your diagnostic strat-
egy.
1. Gather information about the problem from the
customer.
2. Verify that the condition as described by the
customer exists.
3. Check the vehicle for any immobilizer system
DTCs.
4. If you cannot verify the condition and there are no
immobilizer system DTCs, the malfunction is
intermittent. Refer to GROUP 00, How to Use
Troubleshooting/inspection Service Points
− How
to Cope with Intermittent Malfunctions
P.00E-6
.
5. If you can verify the condition but there are no
immobilizer system DTCs, or the system cannot
communicate with scan tool MB991502, refer to
Symptom Chart and find the fault
P.54A-12
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