Immobilizer States: Notes
- Engine Control Module (ECM) States
The ECM has three defined states. These are described below.
ENGINE CONTROL MODULE (ECM) STATESState Description Virgin State - The ECM is delivered to HMC in virgin state
- There is no Vehicle Identification Number (VIN) stored in the ECM
- It can only be in virgin state once
- The ECM will allow starting on the second cycle of ignition
- Virgin state is exited when a VIN has successfully been taught by the BCM
Learnt State Engine start is possible only when the received VIN from the BCM matches that stored in the ECM Neutral State - VIN has been deleted
- Same as virgin state except engine starting not possible on the second cycle of ignition
- Neutral state is entered if the BCM changes to neutral state
- Body Control Module (BCM) states
The Body Control Module (BCM) has three defined states. These are described below.
BODY CONTROL MODULE (BCM) STATESState Description Virgin State - The BCM is set to virgin state during manufacture
- The BCM can be set back to virgin state by issuing an "Initiate BCM" command
- The diagnostics password is set to the default
- No VIN is stored
- Virgin state is exited only after the VIN been learned
Learnt State The BCM contains a VIN Neutral State - The BCM is set to neutral state by issuing a "Teaching ECM" command
- The purpose of the neutral state is to allow the ECM to be set to neutral state
- The BCM neutral state expires 10 seconds after an ignition ON-->OFF cycle