Hey folks, first time poster. I bought a 2010 Jaguar XFR March of 2018. At the time of purchase, it had 100,000KM on it. The used dealership, which was somewhat reputable in higher end vehicles had replaced the battery at the time of purchase for me, and for the most part up until the winter time ( Toronto, Canada ), I drove it daily so I was unable to possibly notice if there was a battery drain present. Come winter time after having it sit for a week, it died completely. I figured at first I left a light on or something of the sort, and boosted it, drove it fairly often again and same issue after having it sit for a few days. I eventually just parked it for the winter, and replaced the battery in the spring. I left it untouched and it lasted 5 days before completely draining again with new battery. Nothing has been plugged in and I've made sure all lights are off. It is now to the point that if I don't start it in the morning, and in the evening, it will drain the battery to the point that it won't start. The alarm and everything will still work for a couple days, just not enough juice to crank over. Just curious if there is something specific I should be checking prior to taking it in to a mechanic. I'm an HVAC mechanic by trade so fairly handy, and have amp proves and multimeters if need be. Only thing to note at this point, is the trunk light is completely disconnected, and the left front turn signal is intermittent as the housing is a bit loose. Not sure if any of that would cause an issue but just thought it should be mentioned just in case. Thanks for any insights or tips you can offer before taking it in to the dealership.

 

I found this in an earlier post. There is a software update the dealer can perform that addresses battery drain.


TECHNICAL SERVICE BULLETIN No.JTB00213/2010
16 November 2010
Circulate to: Service Manager Parts Manager Warranty Administrator Service Reception Technicians
© Jaguar
All rights reserved.
Subject/Concern: Flat Battery
Model:
XF VIN Range: R00019-S04549
XK Range VIN Range: B32753-B42709
Markets: All
Section: 418-00
Summary
Customer may complain that the flat battery occurs after vehicle is unused overnight or for longer duration without any other
obvious root cause.
Cause: Battery will be subject to a 1.6 amp drain if there is an issue with the MOST bus when the Infotainment Control Module
(ICM) is shut down. Suggested Customer Concern Code - C25.
• This software update should be carried out on any customer complaint of flat battery. The cause of the flat battery
should still be investigated as per normal processes and any other faults found, claimed as a separate Warranty Claim
Action: Should a customer express concern of flat battery, follow the Service Instruction outlined below, as well as investigating
other potential causes of the flat battery.
Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken
as guidance only. Always refer to DDW to obtain the latest repair time.
Labor Time
Operation Description Operation No. Time
Configure the Infotainment Control Module 86.99.75/01 0.4 hours
Repair/Claim Coding
Causal Part: C2Z8937
ACES Condition Code: 42
Service Instruction
1.
SDD must be loaded with SDD DVD123_V7.08 and
Calibration File 56 loaded or later.
Do not use any separate surge protection devices with this
power supply.
Connect a Midtronic battery conditioner/power supply to the
vehicle.
2. Connect SDD to the vehicle and begin a new diagnostic session,
by reading the VIN for the current vehicle and initiating the data
collect sequence.
3. Select the Diagnosis Session Type.
4. Select the Symptoms tab and enter any of the following Symptom
(s).
1. Powertrain / Engine system / Starting system / Will not start /
Cranks too slow or
2. Powertrain / Engine system / Starting system / Will not start /
Will not crank or
3. Electrical / Battery / Quiescent current / Quiescent too high or
4. Electrical / Battery / Charging system / Flat battery
5. Electrical / Battery / Power distribution / Ignition supplies /
No ignition.
5. Select the Recommendations Tab.
6. Configure existing module - Infotainment control module, follow
all on screen instructions.
7. When all tasks are complete, exit the current session by selecting
the Session tab and then selecting the Close Session option.
8. Disconnect SDD and the battery charger/power supply.

 

The other thing you can try is totally disconnecting the battery. Waiting a couple of minutes and reconnecting. On some vehicles if you use the OBD port with any device and it doesn't disconnect properly the car won't go into its 'sleep mode' and continues to drain power. The devices they use to do annual vehicle inspection can cause this. If you disconnect then reconnect the battery it can reset the issue

Would also have the codes pulled to see if any internal issues that are not apparent

 

When I had my Bentley GT, there was a thread on the B forum where a fellow member found that his boot/trunk lamp was staying on.
He found it by setting his mobile phone to record then leaving it in the boot/trunk when he shut it. Hey presto, problem sorted.
It's worth a try at least. Good luck.

 

Write-up on Quiescent Current Drain

and just now

JagRepair.com - Jaguar Parasitic Test