Jaguar XK8 XKR X100 Relay Identification & Location Guide (1996-2005) - Brown, Black & Micro. V209

If you own a Jaguar XK8 or XKR (X100), you know that relays are tucked away in some very unexpected places. In this video, we go beyond the standard fuse boxes to show you exactly where every relay is hidden—including the "secret" ones behind the dashboard and under the front bumper.

We cover the three main types of relays used in the XK8:
Brown (40A / 4-Pin): Part No. LJA6703AA
Black (30-40A / 5-Pin): Part No. LJA6707AA
Micro (20A / 4-Pin): Part No. LNA6705AB

What we cover in this deep-dive:
Engine Compartment: Relays for ignition, horn, headlamps, air conditioning, and the engine management system (EMS).
Bulkhead Extensions: Finding the starter motor, wiper control, and heated windscreen relays.
The "Hidden" Bumper Relay: Locating the large cooling fan relay module tucked under the LH headlamp.
Luggage Compartment: Relays for the fuel pump, rear fogs, and the specific convertible top (hood) relays.
Behind the Dashboard: Locating the door mirror heaters, heater blower motors, and the air conditioning isolation relays.

Important Note on Socket Colors: The relay sockets themselves are color-coded (Black, Brown, Blue, and Violet) to help you identify the correct application. Always refer to the wiring diagram for your specific model year (AJ26, AJ27, or AJ34).

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00:00 Introduction
00:19 Three types of relay
Brown LJA6703AA, Black LJA6707AA and Micro LNA6705AB
01:05 Relay socket colours
Black Brown Blue Violet
01:41 XK8 Database
www.modurol.co.uk
02:11 Chapter index
02:26 Engine compartment relays
02:57 Engine compartment fuse box
R7 Ignition
R6 Horn
R5 Dipped bean headlamp
R4 Power wash (where fitted)
R3 Main beam headlamps
R2 Front fog lamps
R1 Air conditioning water pump
04:01 LHS Bulkhead Extension
RHD = Engine Management System Control ECU
RHD = PI main (injectors)
RHD = Throttle motor power
RHD = Ignition coil
Air conditioning clutch
Windscreen Wipers on / off
Windscreen wiper fast / slow
05:42 RHS Bulkhead Extension
LHD = Engine Management System Control ECU
LHD = PI main (injectors)
LHD = Throttle motor power
LHD = Ignition coil
Start motor
Heated windscreen LHS
Heated windscreen RHD
06:16 AJ27 changes additions
O2S Heaters
Intercooler pump
06:54 AJ34 (4.2) modifications
Bank 1 O2S heater
Bank 2 O2S heater
07:31 Behind the front bumper under the LHS headlamp
Cooling fans
08:22 Luggage compartment
R7 Ignition
R6 Accessory socket (optional)
R5 Stop lamps
R4 Fuel pump
R3 Tail and number plate lights
R2 Heated rear window
R1 Rear fog lmaps
09:41 Convertible hood relays
Hood / top raise
Hood / top lower
Left hand rear quarter window raise
Left hand rear quarter window lower
Fuel pump No2 (early XKR)
Right hand rear quarter window raise
Right hand rear quarter window lower
10:37 Dashboard ends
LHS - Auxiliary RHD / Ignition LHD
RHS. - Ignition RHD / Auxiliary LHD
11:14 Behind the dashboard
11:45 LHS behind dashboard
Door wing mirror heater
LHD Power steering
12:54 Drive shaft tunnel
Left hand heater blower
Right hand heater blower
13:36 RHS Behind dashboard
Door lock
Air conditioning isolate
RHD Power steering
14:29 Wrap up
14:54 Links

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This channel is dedicated to all things Jaguar XK8, from maintenance and DIY guides to in-depth reviews and restoration projects. Join me as we explore the beauty and intricacies of this iconic British sports car.

Always consult your vehicle's service manual and follow safety precautions when working on your car. This video is for informational purposes only.

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