Jaguar X-Type Headlights Not Working, Bulb Failure
On the X-Type a dark headlight is usually just a bulb — or the plug on it, melted onto the spade — and access, not the part, is the hard bit. If both dipped beams die at once with good bulbs, look at fuse F67 and the backup alarm sounder before the relay. Bulbs that keep blowing point at bright aftermarket bulbs and charging voltage.
How bad is it · Garage, carefully
Daylight only until the dipped beam is back
The car runs normally, but without dipped beam you can't drive safely or legally after dark. Main beam is no substitute in traffic.
Which one applies to yours depends on your symptoms, your model year and what has already been done to it.
Likely causes, most common first
Read the check cost before the odds: a free check that rules a cause out beats a likely guess that costs money.
A blown bulb, and often its partner soon after
The outer lamp carries the dipped beam (H1 on halogen cars), the inner lamp the main beam and a 5 W capless side light. Both sides are the same age and run the same hours, so one going is a warning for the other.
One side dark, the other fine. If both dipped beams die together, check the bulbs anyway — two can fail within a week of each other.
Turn off the round cover behind the lamp and look at the filament. Room is tight: lift the battery box cover on the left, or take the battery box out (10 mm, battery disconnected first). On the 2.2 diesel the off-side lamp is boxed in by the module behind it. The bumper never needs to come off for a bulb. A long screwdriver pushes the backplate clip towards the wing, and a short hooked wire pulls it back one-handed; the flat on the bulb base sets which way it goes in. Headlamp washer hoses make the left side tighter still.
Fit a standard-wattage bulb of a known brand, and change both sides together. Mark the top of the rubber cover before you take it off — it goes back every way but the right one.
The bulb connector has melted
A tired contact on the H1 spade heats up, softens the plastic plug and welds it to the bulb. The contact gets worse with every hour until the lamp goes out, and a new bulb on a burnt plug won't last.
The plug won't come off the bulb, or comes off brown and deformed. Often a lamp that went out while driving. Sometimes the bulb comes out but the terminal breaks with it, because the two have fused together.
Look at the plug and the spade when you change the bulb. If it's fused on, warm it with a soldering iron and ease it off with long-nose pliers.
Cut back to clean wire and fit fully insulated spade terminals, soldered into the crimp — the plug isn't sold on its own. Renew the bulb at the same time.
No voltage at the bulb on one side, so that side's dip fuse
Each dipped beam has its own 20 A fuse in the engine-bay box. On 2006-on cars these are F29 (left) and F30 (right). On early cars F1 (20 A) feeds the dipped beam and the HID relay.
A new bulb changes nothing and the meter shows no voltage at the plug, while the other side works.
Test the dip fuses with a meter rather than by eye, using the fuse chart for your year.
Renew the fuse at the rating on the chart. If it blows again, something on that side is shorting — look at the plug and the loom before fitting another. A fuse below the specified rating will keep blowing on a healthy circuit: a 10 A fitted where the chart calls for 20 A does exactly that.
Xenon lamp flickers, then goes out: the ballast
On cars with xenon dipped beams the lamp is fed by a ballast under the headlamp housing. A power transistor inside it can work loose from its weld, and the lamp flickers and dies although the bulb is sound.
Xenon lamp only: a flicker for a while, then that side stays dark. Halogen cars don't have this part.
Rule out the bulb and igniter first — a failing xenon bulb flickers in the same way, so swap the bulbs side to side before touching the ballast. If the fault stays on the same side, the ballast comes off with a couple of screws and four bolts under the lamp.
Opening the ballast and re-soldering the loose transistor next to the small transformer brought the lamp back at once. Otherwise fit a replacement ballast.
Both dipped beams dead and F67 keeps blowing, the backup alarm sounder
On early cars the 5 A F67 in the glovebox fuse box feeds the dip relay coil and the battery-backed alarm sounder, among others. Water gets into the sounder and its internal battery shorts, so F67 blows and the dip relay never pulls in.
No dipped beam either side, main beam, side lights and fogs fine, bulbs and big fuses all good — and a new F67 blows again.
The sounder sits behind the front left wheel-arch liner; two screws at the front of the liner give access. Unplug it, fit a new F67 and switch on.
If the dipped beam comes back, the sounder was it. Leave it unplugged (the alarm then stays silent when the battery is cut) or fit a new one.
Bulbs that keep blowing, from high-output bulbs and charging voltage
Extra-bright and blue-tinted bulbs are built for shorter life, and the X-Type runs a high charging voltage right after a start, which shortens it further. Cars with daytime running lights burn the dipped beam every mile. Some whiter halogen bulbs are 65 W against the standard 55 W, and are rated for about a year.
A new bulb lasts weeks or a couple of months, usually after fitting a brighter type. Cheap high-output bulbs can last only a month or two. Fake-xenon bulbs also upset other electrics: clock, panel lighting.
Note what's fitted. With the engine running, measure the battery voltage — the battery light page gives the normal range for these cars.
Go back to standard or long-life bulbs at the original wattage. Worth trying before any wiring work.
Dip relay or headlight switch
Both dipped beams go through one relay — R9 on pre-2003 cars, R11 on later ones — switched from the light switch. A dead relay or switch kills both sides with every fuse intact.
Both dipped beams out together, bulbs and fuses all good, F67 not blowing.
Swap the dip relay with the main-beam relay of the same type (R15 pre-2003, R1 later). If the fault moves, it's the relay. If not, measure the voltage across the relay coil with the switch on. On left-hand-drive cars the junction box sits low on the outboard side by the driver's knee; the headlight relay is the small black one at the upper left of its grey section.
Renew the relay. If the coil gets no signal, the switch or its wiring is next.
A broken wire or a poor earth
The loom coming out beneath the engine-bay fuse box can break inside its insulation. A corroded earth at the lamps or on the cross-car beam starves the bulbs and cooks contacts.
Lights that come and go, dim when other loads switch on, or a fault that survives new bulbs, fuses and relay. Repeated bulb failures after earlier front-end work can be damaged wiring rather than bulbs. Oxidised wiring and furred terminals also cost light.
At night, engine running, dipped beam and A/C on: press the brake and sound the horn. If the headlights dim, chase the earths first. Then work along the loom under the fuse box.
Clean and tighten the earths, repair the broken wire. Hard to find, easy to fix once found. A loom that has fried needs replacing, and that costs real money at a dealer, so find the fault before fitting anything brighter.
The order to check them in
The point of the order is money: each step either rules a cause out or makes the next one worth doing. Green is free, amber costs a little, red is the one to arrive at last.
Work out which lamp is out
Outer lamp is dipped beam; inner lamp is main beam with the side light at the top. The fob and the stalk flash only the main beam, so a working flash proves nothing about the dipped beam.
freeLook at the bulb and its plug
Lift the battery box cover on the left or take the box out. Check the filament and the plug; a brown, welded plug needs new terminals, not just a bulb. Change both sides together.
£10–25Measure voltage at the plug
Lights on, meter across the plug. Voltage there with a dead lamp means a bad contact or bulb; no voltage means look upstream.
freeCheck the fuses for your year
Early cars: F1 (20 A) in the engine-bay box and F67 (5 A) in the glovebox box. 2006-on: F29 and F30 (20 A each) for left and right dip. The fuse box pages show where they sit.
freeIf F67 blows again, unplug the alarm sounder
Two screws at the front of the left front wheel-arch liner, unplug the sounder, fit a new F67. Dipped beam back means you've found it.
freeSwap the dip relay
Swap it with the matching main-beam relay. If the fault moves, buy a relay; if not, measure the coil feed with the switch on.
freeTrace earths and the loom
Do the horn-and-brake dimming test, clean the lamp and cross-car beam earths, then check the loom beneath the engine-bay fuse box.
An hour or twoThe fuses named above — where they sit
The highlighted position is the one the procedure talks about. Pulling a fuse is a stop-gap, never a repair: check what the circuit feeds before you pull it.
Circuit descriptions from the Jaguar handbook, 2002 edition, p. 144, 145, 146. Drawing by jagaux.com from the factory electrical guide. Fuse layouts change between model years — read the legend on the lid of your own box before pulling anything.
Circuit descriptions from the Jaguar handbook, 2002 edition, p. 140, 141, 142. Drawing by jagaux.com from the factory electrical guide. Fuse layouts change between model years — read the legend on the lid of your own box before pulling anything.
What it usually isn't
Don't spend money here first:
If none of this finds it:
On jagaux.com
- X-Type 2002 fuse boxesWhere F1 and F67 sit on early cars.
- X-Type fuse boxesThe dip fuses F29 and F30 on later cars.
- Jaguar X-Type Battery Light On While DrivingIf bulbs keep blowing, check the charging voltage.
- Jaguar X-Type Battery Drain, Flat After StandingIf the lights died along with a flat battery and a row of warnings.
- Jaguar VIN decoderConfirm your exact model year, engine and factory options before ordering parts — free.
Ratings, fuse numbers and torque figures vary by model year and market. Read the legend on your own car before pulling anything, and use the figures in the manual for your car, not the ones in a video.
Check your VIN: exactly which car you have and which bulletins apply to it.