Got the indication fault on the dash, that my right rear turn signal was bad. Bought the new bulb, and replaced it. Buttoned it all up, but still getting the dash fault, and the right side signal is still in “ fast mode”. But, the turn signal is flashing OK.

So, how do I get the fault to permanently go away? This began about the same time that I replac3d the battery, with a dealer purchased Jaguar branded battery.

 

That's a bit weird - you could try disconnecting the battery to do a hard reset - make sure the battery is fully charged before reconnecting

 

Thanks McJag,
That is my next move, as I am perplexed at this point.
I also plan to remove the TL assembly, and examine the wiring, very closely.

 

I had the self same problem. The replacement bulb I fitted was a known brand from Halfords.

The solution was to buy a much more expensive, "factory" original bulb from SNG Barratt.

Apparently, the resistance (or impedance?) of the bulb must be within a certain range in order not to register as a failed bulb.

 

Thank you! This makes sense, as I picked up a bulb from an auto store, that had both the same part number. I will get a new one from SNG Barratt.

 

Since I happened to be going past my local JLR dealer, I decided to just get the bulb from them.
Hole Catsh#&#$t Batman, $23. Dollars and change for one bulb!
if it fixes the issue, I will be OK with that though, won’t know until I get back from travels.

 

This all seems very odd to me. The resistance of an incandescent light bulb is related to its wattage (i.e. brightness). If two 12V bulbs have the same wattage they should have very similar resistances.

 

@justinhill , you're entirely right of course. However, who's to say the replacement bulb was in fact a classic incandescent bulb.
As you know, wattage does not necessarily imply brightness. "Lumens" does. (providing for clarification of others)
There is no need for a Jaguar branded bulb. But a correct bulb type is essential.

Cheers!

 

Maybe it is odd, but the issue only arose after the non OEM bulb was used.
As I said, if it corrects the problem, all good.

 

My understanding is that the bulb must have a resistance (or an impedance perhaps, which is not the same thing) within a fairly tight range or it is flagged as having blown. e.g. (invented numbers, not measured) perhaps a resistance between 1550-1650 ohms. So if it is actually 1750 ohms it wont be significantly different light output, but will get flagged as a blown bulb. Of course it doesn't have to say JAGUAR on it, but you cant take an test meter into Halfords and go through all the bulbs until you find one within the range limits, because you don't know what they are, and Halfords might object. So the only way to be sure is to buy a Jaguar approved one.

 

It's elementary my Dear Wattson - W = I squared x R

 

Factually correct though kind of misleading in this, fixed-voltage, situation since it sort of implies that increasing resistance would increase power, rather than the opposite,

W = I x V - power is amps x volts. I = V / R - amps is volts divided by resistance. Where V is fixed, increasing R reduces I, and W.

 

one tip if I may, replace them in PAIRS

 

is that because they usually fail about the same time, or, another reason for your comment?

 

as a mechanic we were always taught to do so..in practice I've seen the other fail immediately...different resistance maybe but too many times to be a fluke...and on resistance the jags are pissy

 

Update….

bought the Jaguar brand rear turn signal bulb, part #c2p8525, and installed. Initially, the turn signals operated fine. After a half hour drive, I got a dash message, saying the right front turn signal bulb was out. Also, my TPMS a message went awry, signaling that each tire needed air. These message would disappear automatically, and the signal operating performed normally. This issue is only affecting the right side.

i had a conversation with a Jag tech, who suggested that it may need a “ turn signal module”, which is under the rear seat. Said it would be en expensive part, and I should schedule a service appointment. At this point, if the issue doesn’t clear up, I may make that appointment.

 

Replace the other side bulb with the same part number as the new one you installed.

 

yes, that is my plan, but my local, 1/2 hour away dealer did not stock the correct bulb. I hesitate to use a parts house bulb. Ordered the correct bulb from a online jag dealer.

also, I am going to do a hard reset to the battery cables.

 

Update #2

did a hard reset with the battery cables. Drove the car, and now, both the right side turn signal bulbs stopped working, front and rear.
I still get the fast TS indicator on the dash

is there a turn signal module somewhere that may need to be replaced, or another control device?

 

I had this bulb blown error on my 2009 XKRS - really annoying, I replaced all the Bulbs with LEDs, everything as per below, they were not cheap and you would imagine they would drive a Jaguar crazy with errors but no - everything is good. I did notice the rear stop tail was very picky and I did not use LED for that

RW380RR/ PS1/5W Brake & Tail bulb twin - RING Automotive
Qasim 4pcs T10 501 LED Bulbs White W5W 194 168 LED Canbus No Error 2016-18SMD 450 Lumens for Car Side Lights Interior Dome Map Door Courtesy Number Plate Lights
SageSunny 4pcs T10 W5W 501 LED Bulbs 12v 6000k White Canbus LED 194 168 2825 Wedge 24-SMD 3014 Chips Car Bulb for Interior Dome Map Door Side Marker Courtesy Number Plate Lights Replacement
Keiurot 36MM Festoon Led 6418 Led Car Bulbs C5W Bulb CANBUS Error Free 239 6461 Led Festoon Bulbs for Car Interior Dome Map Door Courtesy Number Plate Lights White 12V-24V,Pack of 4
CRYSTAL Lens 501 (W5W) T10 (12V-24V) Canbus LED White Sidelight, Car Interior, Trunk, Footwell, Door, Number Plate, Cabin Dome light bulbs, Pack of 2
OSRAM DIADEM CHROME PY21W halogen, signallamp, turn signal light, 7507DC-02B, 12V, double blister 2 pieces
OPL5 D1S LED Headlight Bulbs, Newest Version Built in Decoding Driver D1S LED Headlight Bulbs Replacement OEM Xenon Bulbs, 8600LM 70W 6500K Xenon White Plug and Play LED Lamps Conversion Kits (2 PCS)