Jaguar X-Type Key Fob Not Working
On the X-Type a dead remote is often a good fob that has lost its pairing, or a sticking flap in the key slot that makes the car think the key is still in. Free the flap, fit a fresh CR2032 and re-pair with four ignition cycles before you buy anything. If a new key opens the doors but won't start the car, it's the chip, not the remote.
How bad is it · Safe to drive
Drive it — lock it with the blade meanwhile
A dead remote doesn't stop the car; the blade still opens the doors and starts the engine. Only a key the immobiliser refuses leaves you stranded.
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.
The fob has lost its pairing with the car
The buttons are paired to the car separately from the chip that lets the engine start. The pairing can drop, for example when a battery swap takes too long, and the fob then looks dead.
Range shrinks for a while, then the remote stops altogether. The blade still opens the door and starts the engine; a fresh battery changes nothing.
Key in the ignition, turn it between I and II four times in quick succession until a single chime, then press a button on every fob you want to keep; each one answers with a tone. Four cycles, not three — the sequence in bulletin XT501-23.
Re-pair every fob in the same session, four at most. If the remotes work again only for a while, the transmitter itself is on its way out.
The flap in the key slot sticks open
A spring flap in the ignition key slot tells the car the key has come out. If it doesn't close, the car thinks the key is still in and ignores the remote.
Now and then none of the four buttons will lock or set the alarm, and the car may sound an error tone or behave as if a door were open. Switching the ignition on and off once lets it arm. A new fob battery makes no difference.
Withdraw the key slowly and look at the slot: the flap should snap shut every time.
A little WD-40 in the slot, then work the key in and out a few times. If it sticks again, pack silicone grease on the key tip and insert it ten times or more — a single squirt may not last.
The transmitter inside the fob has died
The fob electronics fail on these cars, sometimes after the case has come apart. Early fobs failed often and were redesigned. An anti-static pad was added inside the fob by recall, partly against interference in built-up areas, 2004 model-year fobs were exchanged by dealers, and transmitters still die after that.
Battery and re-pairing both do nothing, while another fob on the same car works. Re-pairing a dead module never brings it back.
A parts-store remote tester shows whether the fob transmits at all. It's also worth asking a Jaguar dealer whether yours falls under the exchange.
Fit a new transmitter and pair it with the four-cycle routine, using the existing key blade. Match the frequency: 315 MHz for North America, 433.92 MHz for the UK and Europe — the two look identical. A cheap copy may refuse to pair where a genuine part takes; an independent key shop can do the job, for example free of charge, against a dealer's $250 to $400 for a complete key. The transmitter board unclips from the key body, which carries the start chip, so a working board from another fob can go into your own case and be paired. A postal fob repair service can also rebuild it, for example for about £15, though a repair may not last.
A new key opens the doors but won't start the car
The start chip (transponder) and the remote are two parts in one housing. Pairing the buttons doesn't teach the car the chip — the immobiliser still refuses it and shows Security Failed.
Lock and unlock work from the new fob, but the engine won't start on it. A blade that won't even turn hasn't been cut for the car.
Count your working keys. With two, a third chip can be added at the ignition: each working key in turn on and off, then the new key within about 30 seconds. With only one, it takes a dealer or a locksmith with a diagnostic tool.
Add the chip with the key-cycling routine, or take every key you want to keep to the dealer — a key that isn't there when the car is programmed gets deleted. Keep three keys, so losing one never leaves you below two. Security Failed straight after a used instrument cluster goes in is the same lock: the cluster has to be matched with a scan tool.
A flat fob battery
The range fades gradually as the cell weakens, until the remote won't work even close to the car. A weak cell can also upset the alarm.
Range shorter every day, one fob only.
Slide the button section off the key, prise the halves apart at the notch, undo the small Phillips screw and lift the board: the CR2032 sits underneath.
Worth doing first: fit a fresh CR2032 and be quick about it. If the remote still doesn't answer, re-pair it.
Worn contacts under the buttons
A conductive pad on the back of each rubber button wears thin, and the microswitch underneath can corrode, so one button works only now and then.
One button, often lock or unlock, needs several presses; the buttons still click. A worn unlock button can leave only the driver's door opening.
Open the fob, take out the rubber pad and press each microswitch directly. Pressing lock and unlock together switches the unlock mode, so it also shows whether the lock button transmits; press them again to switch it back.
Worth trying: clean the switches and contacts, and reseat the board in the case. A key shop can often repair the fob for little money.
Short range from interference or the car's receiver
A strong nearby transmitter can swamp the car's receiver, and metallic window tint can block the signal. If neither applies, the receiver, its aerial or the feed between them is left. The receiver sits in the GEM above the accelerator pedal, with its aerial in the rear window.
Both fobs work only within a metre or two.
Try it somewhere else. Worse in one spot means interference; the same everywhere, with good fobs, points to the car.
Worth checking for aftermarket tint before suspecting the receiver.
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.
Try the blade and listen to the horn
If the blade opens the door and starts the car, the fault is in the remote side. Three short horn blasts when you press lock mean a door isn't fully shut, and the car won't lock by design.
freePull the key out slowly
Watch the flap in the key slot close. If it lags, a drop of light oil and a few insertions.
freeFit a fresh CR2032
The cell sits under the circuit board, held by a small Phillips screw. Be quick, or the fob may need re-pairing.
a few poundsRe-pair every fob in one session
Ignition between I and II four times until the chime, then a button on each fob, four at most.
freeCheck that the fob transmits
A parts-store remote tester, or open the fob and press the microswitches directly.
freeOnly now a new transmitter
Match the frequency for your market and pair it yourself with the existing key. A key that must also start the car needs its chip added as well.
a few pounds to about $50What it usually isn't
Don't spend money here first:
If none of this finds it:
On jagaux.com
- Jaguar X-Type Won't Start, No Crank or Crank No StartIf the key is accepted but the engine still won't turn or fire.
- Jaguar X-Type Battery Drain, Flat After StandingIf both fobs died together with a flat battery and a row of warnings.
- Jaguar X-Type Headlights Not Working, Bulb FailureIf the alarm sounder has failed and the dipped beam went with it.
- Jaguar X-Type Door Won't Open, Central Locking Not WorkingIf the key blade won't open the door either, or the handle does nothing.
- Jaguar X-Type Boot Won't Open, Trunk ReleaseIf the boot won't open from the fob or the button, or sets off the alarm.
- 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.