Honda Immobilizer

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Honda Immobilizer
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1949 Chrysler, first with starter switch in
ignition key
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Theft deterrent passively or actively interrupts
a circuit in the ignition, fuel, or start circuit.
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The key must be recognized in order for the
vehicle to start.
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6 Immobilizer types
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Basic immobilizer components Key/transponder,
lock cylinder (transceiver/receiver),
Immobilizer control unit, ECM/PCM
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Transponder Key does not contain batteries
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There are billions of ID codes.
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Each system has a receiver unit which is an
antenna attached to the ignition switch.
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Receiver unit energizes the transponder (key) and
the transponder transmits the key code to the
immobilizer control unit.
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The ECM/PCM receives the unique serial code from
the immobilizer control unit
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Immobilizer control unit sends a unique serial
code to the ECM/PCM
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ECM/PCM confirms the ID code, it sends a
handshake back to the immobilizer control unit
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Serial codes are mutually recognized, the ECM/PCM
enables the fuel system
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Type one system, disables start and fuel
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Type 2 systems use a receiver connected to the
immobilizer control unit which is built into the
ECM/PCM
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Type 3 and 4 systems use an immobilizer control
unit and a receiver built into one unit
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Type 5 and 6 systems use a combination
immobilizer control unit receiver along with an
additional security IMOES unit(immobilizer entry
system)
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Type 6, engine start then code is checked, no
match engine dies
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Signal from the keyless access control unit is
sent out to the ECM/PCM and IMOES
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Master key with black grip ignition, door,
trunk, glove box. Valet key with gray grip
Ignition door locks
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traditional key and the sidewinder key (2002
later)
Matrix H Key Cutting Machine Required for
Sidewinder Key
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Type 2 3 stamped with a "F" for fixed
transponder codes.Type 4 - 6 stamped with a "V"
for rolling transponder codes
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Type 1 system 1997 - 2001 Prelude, 1996 - 2004
3.5RL, 1997-2005 NSX.
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Type 1 Red learning key puts immobilizer
system into a re-programming mode to add delete
keys. The red learning key will not start the
engine.
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A lost red learning key requires replacing the
immobilizer control unit.
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Green immobilizer system indicator confirms
operation. Controlled by immobilizer unit in
Types 1 through 5 and by CAN in Type 6.
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Vehicles normally come with three keys HDS needed
to program additional keys
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If one key is being added, you only need one
programmed key from the customer (except Type 1,
all programmed keys are needed.)
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At times, all programmed keys are needed for any
system
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Type 1 - 3 , ilco Key Code Duplicator and
ilco programmable key blanks marked with "T5"
can be used to make a duplicate key,
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Type 1 accept a total of 5 keys, not including
the red learning key. Type 2 - 6 accept a total
of 6 keys.
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If no programmed keys, or system failure, you can
still start the engine using a cut key blank and
a VIN specific Immobilizer Brake Code
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5 digit brake code is entered using the ign
switch the parking brake
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Cranks no start Verify system indicator is
working Try using the key only without key
rings or other keys attached
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HDS troubleshooting with System Check and
Status Log
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Results of system check
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Status Log
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Diagnosis Using PID data
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BAN indicates immobilizer fault
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HDS need for replacing parts
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Early Type 2 requires all keys for PCM programming
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If lamp on with engine running it is a free start
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