V8 XJ Series/XK8
DATE
4/97
Amended 4/98
418-03
SERVICE
TECHNICAL BULLETIN
MODEL
Control Modules – Compatibility –
Interchanging Between Vehicles
Remove and destroy Bulletin 418-03, dated 4/97.
Replace with this Bulletin.
V8 XJ Series information has been added.
1997 MY-ON XK8 Range
1998 MY-ON V8 XJ Se ries
VIN
001001-ON
812256-ON
Issue:
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).
Action:
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.
PROGRAMMABLE CONTROL MODULES - XK8
ENGINE CONTROL MODULE
MAJOR INSTRUMENT PACK
DOOR CONTROL MODULE
SEAT CONTROL MODULE
BODY PROCESSOR MODULE
SECURITY AND LOCKING
CONTROL MODULE
ILLUSTRATION 1
Date of issue 4/97 Amended 4/98 Bulletin Number 418-03 Page 1 of 3
PROGRAMMABLE CONTROL MODULES - V8 XJ SERIES
SEAT CONTROL MODULE
ENGINE CONTROL MODULE
SAMPLE VCA TS LABEL
SECURITY AND LOCKING
CONTROL MODULE
DOOR CONTROL MODULE
BODY PROCESSOR MODULE
IP1188
ILLUSTRATION 2
Abbreviations:
PSM Passenger Seat Control Module
DSM Driver Seat Contr ol Module
PDM P assenger Door Control Module
DDM Driver Door Control Module
SLM Security and Locking Control Module
IPK Major Instrument Pack
BPM Body Processor Module
ECM Engine Control Module
others not illustrated:
KTM Key Transponder Module
TCM T ransmission Control Module
DRDM Driver Rear Door Control Module
PRDM Passenger Rear Door Contr ol Module
ILLUSTRATION 3
If further diagnosis appears to point to a defect within a control module, note the 3 conditions on
the following page before interchanging control modules between identical vehicles to confirm
diagnosis.
1. Refer to illustration 3, which shows a typical VCATS (V ehicle Configuration And Test
System) label, located behind the spare tire on the trunk floor of XK8 models and behind the
trunk trim on the left side of the spare tire on V8 XJ Series. Each label is specific to each
individual vehicle, and lists the VIN of the vehicle along with the part numbers of the CMs
originally installed in the vehicle during manufacture.
Page 2 of 3 Bulletin Number 418-03 Date of issue 4/97 Amended 4/98
2. In the example above, the part number of the Body Processor Module is identified as:
LJA 2500AG/055.
In the above, the basic part number LJA 2500AG has been programmed during vehicle
manufacture for the specific market and features of the vehicle concerned, and is identified as
/055.
This would be the complete part number for a replacement BPM for the vehicle concerned,
if it were necessary to order one from Jaguar Parts Operations.
Note that the suffix /055 (in the example above) does not appear on the label on
the CM concerned. This number appears only on the VCATS label of the vehicle.
3. It is permissible to temporarily interchange a CM from another vehicle for testing purposes,
only if:
• The full vehicle history of both vehicles is available.
• The history of both vehicles indicates that the CM in question has not previously been
replaced by a CM from another vehicle or by a replacement part.
• The VCATS label information for the full part number of the CM in question on both
donor and recipient vehicle is identical, as illustrated above.
• The donor vehicle is known to have no electrical defect.
WARNING: Always disconnect the battery first, and reconnect it after
connecting the replacement CM. The possibility exists, particularly for
control modules that control the movement of door windows or power
operated convertible tops, for inadvertent uncontrolled operation of these
systems, if the battery remains connected during such operations. This can
result in injury to persons working on the vehicle.
PARTS INFORMATION:
When ordering a replacement Control Module via Jaguar Parts Operations, list the FULL part
number, as listed on the VCATS label of the vehicle in question, so that the replacement unit can
be programmed before shipment to match the specification of the module being replaced.
Date of issue 4/97 Amended 4/98 Bulletin Number 418-03 Page 3 of 3
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