Land Rover Defender: Anti-Theft - Passive - Component Location, Overview

COMPONENT LOCATION

COMPONENT LOCATION - 1 OF 4

NOTE: Right Hand Drive (RHD) vehicle is shown, Left Hand Drive (LHD) vehicle is similar.

1. Immobilizer Antenna Unit (IAU)
2. Ignition switch
3. Body Control Module (BCM)/ Gateway Control Module (GWM)

COMPONENT LOCATION - 2 OF 4

NOTES:

• RHD vehicle is shown, LHD vehicle is similar.
• Vehicle with 5 doors is shown, Vehicle with 3 doors is similar.

1. Radio Frequency (RF) receiver
2. Remote Function Actuator (RFA)

COMPONENT LOCATION - 3 OF 4

NOTES:

• RHD vehicle is shown, LHD vehicle is similar.
• Vehicle with 5 doors is shown, Vehicle with 3 doors is similar.

1. Low Frequency (LF) - Front passenger compartment
2. LF - Right passenger compartment
3. LF - Left luggage compartment
4. LF - Rear passenger compartment - Only for passive start system
5. LF - Left passenger compartment

COMPONENT LOCATION - 4 OF 4

NOTES:

• RHD vehicle is shown, LHD vehicle is similar.
• Vehicle with 5 doors is shown, Vehicle with 3 doors is similar.

1. Passive entry transceiver - Front
2. Passive entry transceiver - Rear

OVERVIEW

The passive start system relies on the detection of a uniquely coded smart key through LF antennas strategically situated within the vehicle. The LF antennas sense when the smart key is in the active transmission zone of the LF antennas. The transmission zone allows the smart key to be detected inside the vehicle. For this reason the orientation and position of the antennas is critical to the correct functioning of the system. The smart key also operates the passive entry system.

The passive start system provides a secure interface between the BCM/ GWM and the Powertrain Control Module (PCM). The interface prevents unauthorized starting of the engine. Encoded data exchange between the smart key and multiple control modules immobilizes the engine crank system and the fuel system.

Engine starting is initiated when the encoded data exchange between the smart key and the control modules is verified. The engine management system then allows engine crank and fueling when an authorization data message is received from the BCM/ GWM.

The engine can be started by pressing the ignition switch when PARK position is selected and the brake pedal is pressed.

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