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