Date of issue 4/97 Amended 4/98 Bulletin Number 418-03 Page 1 of 3
V8 XJ Series/XK8
Control Modules – Compatibility –
Interchanging Between Vehicles
To cover the many variations in vehicle specification which are available in various markets,
information is programmed into the Control Modules (CM) during vehicle manufacture which, in
many cases, may be specific to a very limited number of vehicles within a single market.
For example, the Body Processor Module (BPM) of a coupe vehicle does not contain the control
system for the power operated soft top of a convertible model.
Should a similar, but not identical, CM from one vehicle be installed in a second vehicle, this
may result in various malfunctions in the second vehicle. Since the CM may then ‘learn’
information from the second vehicle, incorrect data would then be transferred back to the first
vehicle when the CM is transferred back to its original location. This is particularly applicable in
the case of the Engine Control Module (ECM).
When diagnosing electrical malfunctions, assume that no defect exists in the relatively robust
CM set in the vehicle (Illustrations 1 and 2). Since a defect is more likely in connectors or
switches, initial diagnosis should concentrate on these components.
1997 MY-ON XK8 Range
1998 MY-ON V8 XJ Series
Remove and destroy Bulletin 418-03, dated 4/97.
Replace with this Bulletin.
V8 XJ Series information has been added.
SEAT CONTROL MODULE
PROGRAMMABLE CONTROL MODULES - XK8
MAJOR INSTRUMENT PACK
DOOR CONTROL MODULE
ENGINE CONTROL MODULE
BODY PROCESSOR MODULE
SECURITY AND LOCKING