Defender. Manual — part 241
memory.
The anti-theft system module also controls;
the active anti-theft system.
For additional information, refer to:
Anti-Theft - Active
(419-01A Anti-Theft - Active, Description and Operation).
the central locking system.
For additional information, refer to:
Handles, Locks, Latches and Entry Systems
(501-14 Handles, Locks, Latches
and Entry Systems, Description and Operation).
interior lighting.
For additional information, refer to:
Interior Lighting
(417-02 Interior Lighting, Description and Operation).
the hazard flashers.
For additional information, refer to:
Exterior Lighting
(417-01 Exterior Lighting, Description and Operation).
ENGINE CONTROL MODULE
The ECM is mounted on the engine compartment bulkhead and works in conjunction with the anti-theft system module
to control the passive anti-theft system.
For additional information, refer to:
Electronic Engine Controls
(303-14 Electronic Engine Controls - 2.4L Duratorq-TDCi
HPCR (103kW/140PS) - Puma, Description and Operation).
CONTROL DIAGRAM
• NOTE: A = Hardwired; D = High speed controller area network (CAN) bus
Item
Part Number
Description
1
-
Battery
2
-
Transceiver coil
3
-
Anti-theft system module
4
-
Diagnostic socket
5
-
Instrument cluster
6
-
ECM
7
-
CJB
8
-
Starter relay
9
-
Ignition switch
10
-
BJB
11
-
Glow plug relay
PRINCIPLES OF OPERATION
The anti-theft system module receives a permanent battery supply from fuse 7 in the BJB. When the vehicle key is
placed in the ignition barrel and turned to position II (ignition on), the anti-theft system module will also receive a
power supply from fuse 8 of the CJB.
When the anti-theft system module receives the ignition switch feed it activates the transceiver coil by supplying a
battery voltage feed from pin 12 of connector C0057, and a pulsed voltage signal from pin 7 of connector C0057.
The pulsed feed from the anti-theft system module causes the magnetic field created by the transceiver coil to collapse
and restore. The fluctuating magnetic field activates the remote RF handset to transmit a mobilization code to the anti-
theft system module.
The anti-theft system module receives the mobilization code via its antenna. This code is compared to a value in its
memory. If the codes match, the anti-theft system module provides a mobilization signal to the instrument cluster. The
instrument cluster acts as a gateway, converting the signal transmitted from the anti-theft system module into a signal
that is recognizable by the ECM. This signal is then transmitted by the instrument cluster to the ECM which will energize
the starter relay and the fuel injectors to allow the engine to be started.
Emergency Key Access
If the vehicle is immobilized and the remote RF handset is not available, the emergency key access procedure will allow
the engine to be mobilized using the vehicle key. For information on the emergency key access feature, refer to the
Owners Handbook.
Anti-Theft - Passive - Passive Anti-Theft System (PATS) Transceiver
Removal and Installation
Removal
1. Remove the steering column shrouds.
For additional information, refer to:
Steering Column Shrouds
(501-05 Interior Trim and Ornamentation, Removal and
Installation).
2. Disconnect the passive anti-theft system (PATS)
transceiver electrical connector.
3. Remove the PATS transceiver.
Installation
1. To install, reverse the removal procedure.
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