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so ive had my xf about a year now and about a 5ish months ago my car died, no power, alternator wasnt charging. fast forward, new alternator on but the red warning light stayed, was told by the garage (german) that it was due to the computer system in the car not accepting the new part. was unable to get to a jag specialist to check the system out due to work but about a month ago i was driving from the bottom of england to scotland, i breakdown on the m6, i get multiple warning on my dash and the car will not let me change gear. i get to the side of the road and im having power issues, car wouldnt start and struggled to keep the hazards on. i get it jumped and on the recovery truck etc.
they have refurbed the alternator but nothing changed, tried a new module on the battery but no change, recharged the battery but still no change. they then took it to a jag specialist who replaced the alternator with a genuine part but no change there either. im running out of options and no idea what could be the problem. if i remember right its not charging at the correct voltage either even with different alternators. the car has been driven for months with no problem even though the red warning light was on due to me thinking it was just a system problem from the garage telling me so and has also driven longer journeys e.i. 1000 miles (germany to scotland via dover) a few times so i dont know why this has happened now.
any help would be amazing. the car is a XF 2.7D auto premium luxury 2009, no non standard mods bar the new alloys i had put on.
The electrical distribution system on a modern Jaguar is complex but the charging system is relatively straightforward. First essential with spurious electrical faults is to eliminate a faulty or partially discharged battery as possible cause. Many members go into denial on this but it's remarkable how often it does turn out to be the problem.
If I follow the sequence correctly, you had an aftermarket replacement alternator fitted in Germany by a non-Jaguar garage. This was subsequently refurbished (again not by a Jaguar Dealer or independent specialist) before being replaced with an OE alternator. The concern here must be that it was one that fits rather than fits AND has the correct output.
Jump starting a Jaguar must also be done carefully to avoid spikes frying sensitive electronic components. It's not just a matter of connecting a set of jump leads directly to the battery!
Assuming the battery mounting and alternator cables have been checked, the next suspect is the BMS (Battery Monitoring System) mounted on the negative terminal. This signals the calculated voltage to the ECM via the RJB and the instrument cluster. The ECM then transmits the calculated voltage to the generator and regulator on the LIN (Local Interconnect Network) bus connection. The ECM over-rides the voltage value requested by the battery monitoring system if it detects a fault in the generator and regulator. The ECM also signals the instrument cluster to display a warning if it detects a fault with the generator and regulator.
Troubleshooting this issue has to begin with a battery test and checking for DTC (Diagnostic Trouble Codes) using Jaguar SDD (Symptom Driven Diagnostics) or equivalent. Without a systematic approach, it is simply guesswork.
Ahh that makes sense I'll give you a run down of what has already been done so far, so they have tried 3 different alternators the final one being a genuine jag part all having the same problem only giving out 13.5v. They have tried new modules (x2) on the battery neg so it's not that, a jag specialist has checked the wiring and nothing was wrong there. The only thing I can see that hasnt been tried is a fitting a new battery as they only charged the old one and put It back, I have a genuine new one that I'm about to fit tomorrow or the day after. Due to not having time currently, the car still runs fine Aslong as I don't put on too much electrics (IE. I can use the touch screen, phone charger, headlights and full beam, wipers and AC) but I think It starts going down hill when I try to use the rear window heater and the heated seats. The start button light pulses aswell and it doesn't start first press intermittently.
It will be interesting to hear the results of fitting the new OE battery.
Replacement of the BMS control module requires no action as the control module will re-calibrate automatically but when a new battery is fitted, the BMS control module will require re-calibration using a Jaguar SDD or an approved diagnostic system. Some have reported their Jaguars failing to start following battery replacement but other members report having no problems.
When I changed the battery on my XFR I didn't bother recalibrating the BMS as the workshop manual states that it will recalibrate itself after a short while.
Also note that not all new batteries will have a full charge. I once bought a brand new replacement for my Z28 Camaro and it was totally flat.
Hope you get to the bottom of this.
Ive been reading up on it, on other forums and the adv. electrical systems pdf from jaguar to see whats going on and from what i have seen, many people have just switched the battery without doing aything else. The only things most people have reported is that certain systems need resetting ie. global window control, side mirror folding, clock etc. so i think i may chance it as i have already taken this battery out a couple of months ago with no extra equipment to charge it and put it back in, it was out of the car for around 12+ hours. but im going to wait till im back in scotland before i do that as if anything does go wrong ill be stuck here for now. Although i do have a question would a battery memory saver do the job of protecting the information ? also when i put the new battery in will i have to "teach" the system about the current load? ie. running everything and driving at certain speeds? or is that just a bit of nonsense i have stuck in my head.
Ahh that makes sense I'll give you a run down of what has already been done so far, so they have tried 3 different alternators the final one being a genuine jag part all having the same problem only giving out 13.5v. They have tried new modules (x2) on the battery neg so it's not that, a jag specialist has checked the wiring and nothing was wrong there. The only thing I can see that hasnt been tried is a fitting a new battery as they only charged the old one and put It back, I have a genuine new one that I'm about to fit tomorrow or the day after. Due to not having time currently, the car still runs fine Aslong as I don't put on too much electrics (IE. I can use the touch screen, phone charger, headlights and full beam, wipers and AC) but I think It starts going down hill when I try to use the rear window heater and the heated seats. The start button light pulses aswell and it doesn't start first press intermittently.
i think your start button "pulse" is the heartbeat feature on all such cars. it's to add dramatic effect.. unless it's erratically flashing
Ok so update time, plugged the new battery in reset everything i need to and still no change. Im really running out of ideas now. Even took i out on a quick run to see how it fairs but there was still not difference, it has been going into to reduced performance mode a few times now as well but as soon as i turn off the car and start up again its all good to run as long as i manage how much i have on in the car.
so ive had my xf about a year now and about a 5ish months ago my car died, no power, alternator wasnt charging. fast forward, new alternator on but the red warning light stayed, was told by the garage (german) that it was due to the computer system in the car not accepting the new part. was unable to get to a jag specialist to check the system out due to work but about a month ago i was driving from the bottom of england to scotland, i breakdown on the m6, i get multiple warning on my dash and the car will not let me change gear. i get to the side of the road and im having power issues, car wouldnt start and struggled to keep the hazards on. i get it jumped and on the recovery truck etc.
they have refurbed the alternator but nothing changed, tried a new module on the battery but no change, recharged the battery but still no change. they then took it to a jag specialist who replaced the alternator with a genuine part but no change there either. im running out of options and no idea what could be the problem. if i remember right its not charging at the correct voltage either even with different alternators. the car has been driven for months with no problem even though the red warning light was on due to me thinking it was just a system problem from the garage telling me so and has also driven longer journeys e.i. 1000 miles (germany to scotland via dover) a few times so i dont know why this has happened now.
any help would be amazing. the car is a XF 2.7D auto premium luxury 2009, no non standard mods bar the new alloys i had put on.
the same thing happened yesterday when I returning from work car shows me multiple things like battery low gearbox faults engine etc then I shut down the car but after some time I start again and change the battery but stil shows low battery talked with a meccanic he said the alternator problem maybe so now i have to wait till monday anyyy idea 💡 what should I do thanks
You could have an issue with the LIN wire that communicates with the PCM or PCM itself.. IF not asked to charge, the alternator will not charge properly.
my Jaguar been a nightmare I spend more money fixing the car then what I payed for and it’s been in shops more then on the road . Same thing happens to me everything on the dash board will light up then car would cut off then would start back up maybe 30 min late . I had everything u could think about getting fix still nothing . Today the shop said I need a new dashboard which is more money , and he said still not sure if that the issue . But looking at this diagonal u have up here I see a dash board is one . And that’s the o oh thing they didn’t try yet . It’s been 1 month my car been in the shop hopefully this will fix the issue of not . Driving this car off a cliff fast . If I follow the sequence correctly, you had an aftermarket replacement alternator fitted in Germany by a non-Jaguar garage. This was subsequently refurbished (again not by a Jaguar Dealer or independent specialist) before being replaced with an OE alternator. The concern here must be that it was one that fits rather than fits AND has the correct output.
Jump starting a Jaguar must also be done carefully to avoid spikes frying sensitive electronic components. It's not just a matter of connecting a set of jump leads directly to the battery!
Assuming the battery mounting and alternator cables have been checked, the next suspect is the BMS (Battery Monitoring System) mounted on the negative terminal. This signals the calculated voltage to the ECM via the RJB and the instrument cluster. The ECM then transmits the calculated voltage to the generator and regulator on the LIN (Local Interconnect Network) bus connection. The ECM over-rides the voltage value requested by the battery monitoring system if it detects a fault in the generator and regulator. The ECM also signals the instrument cluster to display a warning if it detects a fault with the generator and regulator.
Troubleshooting this issue has to begin with a battery test and checking for DTC (Diagnostic Trouble Codes) using Jaguar SDD (Symptom Driven Diagnostics) or equivalent. Without a systematic approach, it is simply guesswork.
12-04-2018, 12:06 PM
xf charging fault no one can identify
