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To safely use IDS/SDD you need a voltage maintainer. JLR recommend 3 brands (Midtronics CX-Pro 50 ,Traction BSU2-50 or BSU2-125 &
Acctiva Professional flash fronius 70 Amp) which for an amateur user are too expensive. I bought this on ebay
It has proven very successfull with fine voltage adjustment capabilities and ample current capacity, see attached specs. I just added a power cord from a defunct appliance and 18g cable to a quick connect.
$ 30 isnt a bad deal I suppose. I will order one today.
I just paid $25 for a NEW $ 75 15A Schumacher smart chgr/3A maintainer at GoodWill. Rare deal. I loved my $40/10A old school Schumacher. Sometimes a dumb chgr beats a smart charger.
I suspect we are mixing two kinds of battery maintainers...
The kind recommended to use when playing with SDD is expected to provide higher current than the kind you leave with your car in a garage during the winter.
An Amperage insufficient for use with SDD (see subject) keeps getting mentioned: 15A, 10A, 30A... I don't think none of these is safe i.e. high enough.
The one I mentioned gives up to 30A, this is what X350 needs to play with SDD.
I could almost swear I read somewhere about 35A or 37A being the recommendation for the PSU for x350/x358 (and 25A being a very common draw), but I can't remember where, so it probably never happened 😁
the TSB on the link above says that even 55A may be too low and thus you should turn off as much as you can in the car (A/C, ...)
...but that almost sounds like a legal speak
Last edited by Jaroslav Záruba; Dec 30, 2024 at 05:18 PM.
Nop, it is 30A recommended for X350, but if you have another modern car that you take care of yourself, a 50A power supply will certainly be a better solution.
Last edited by PeterX358; Dec 30, 2024 at 05:42 PM.
"The voltage target with the PSC-550 connected and the 'Key On / Engine Off' should be 13.0 - 13.5 volts, even though IDS only inhibits module programming when voltage falls below 12.5 volts. The PSC-550 is designed to supply a constant 13.4 Volts at a maximum rate of 55 Amps. For this reason it is important to switch off all electrical consumers on the vehicle during module programming including headlamps, sidelights, fog lamps, radio, HVAC blower fans, wipers, and defrosters. These additional electrical loads may draw a higher amperage rate than the PSC-550 is designed to deliver, which will cause the voltage to DROP during IDS use."
Not using a really powerful and stabilised power supply, and serious electrical cables, is a recipe for disaster whenever you intend to implement lengthy reprogramming.
I also bought at first a cheapo chinese "50 amps" power supply.
When I opened it, I understood what crap it was:
Since then I bought a professional heavy duty one (and very heavy indeed!):
Day and night!
One important remark: the electrical cables that go from the power supply to the car's battery have to be really thick.
To not loose voltage between the power supply and the car you better have 10 mm2 cables to conduct those 50 amps! Because even a loss of a few tenths of Volt along the few meters of cable can be detrimental and lead to a voltage of below the recommended 12.5 V at the battery leads...
Nop, it is 30A recommended for X350, but if you have another modern car that you take care of yourself, a 50A power supply will certainly be a better solution.
Hi Peter,
If you have a source for that 30A specification for the X350 could you please share it with us? I don't recall ever seeing that figure in any Jaguar documentation.
I am attaching the Jaguar Technical Service Bulletin that Jaroslav linked to previously, and here's an important snip from that TSB that includes the part that paydase quoted:
There are several unfortunate accounts in these forums of members bricking their ECMs and other modules by disregarding Jaguar's mandate regarding available current during programming.
When I first began using SDD, I used a 50A desktop computer power supply, and I did not experience any problems. But when the opportunity arose, I acquired a good used PSC-550 so that's what I use now. Any quality power supply should be suitable if it has a minimum current capacity of 50 amps, tight voltage regulation (the PSC-550 spec. is <1%) and low AC ripple (the PSC-550 spec. is <50 mV). It is important to follow all of Jaguar's instructions regarding turning off all electrical consumers, etc. With SDD, it is possible to cause irreparable damage to the electronic control modules in your car.
"1-224NAS" is a recommendation for services from 2009, not for X350. It is obvious that a service center must have a 50A power supply to support many models.
Last edited by Don B; Jan 1, 2025 at 04:22 PM.
Reason: Light gray font was unreadable.
"1-224NAS" is a recommendation for services from 2009, not for X350. It is obvious that a service center must have a 50A power supply to support many models.
Jaguar regularly issued TSBs retroactively to address issues with models produced prior to the date of the TSB, so TSB 1-224NAS would apply to any Jaguar to which SDD was connected in a dealership service center. In 2009, many X350s and X356s would have still been under warranty, and the electronically identical X358 was still on sale new.
The language in 1-224NAS clearly implies that the power supply mandate had been communicated to dealerships earlier, but that some dealerships had ignored the mandate.
The need for the power supply was apparently discovered as Jaguar service technicians experienced problems when the vehicle battery voltage sagged while using SDD.
I'd still be curious to know if you can give us a reference to a Jaguar document that states that the power supply current requirement for the X350 is just 30A.
Listen to Don about the ripple measurement!
All those crummy u tube links are from people who don't have a clue.
If the power supply does not provide full specifications that is a giant red flag.
Here is what Jaguar wants when the car is attached to SDD.
Again note the ripple specification.
I have used SDD a good bit and while I can't explain it I have measure 30+ amp draws for hours at a time using a separate clamp on ammeter as I was curious about why such a stout power supply was needed.
I also assumed in the beginning a battery charger would be good enough and it usually is IF you are only reading and clearing codes. But when doing programming it is a necessity and I am convinced after reading many SDD disasters that a number of them are due to improper DC power supplies being used.
I use 10 gauge copper wire on my DC power supply. I ALWAYS have the SDD laptop running on AC power ONLY! Again after you have been burned a time or two you start to understand why Jaguar makes such a big fuss about this. SDD is extremely picky and I don't want to cause any user errors if possible!
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Like I said, JLR announced 1-224NAS" in 2009 because new models appeared. Anyway: full agreement that it is always better to have a stronger LPS, but of course they are not so well priced.
Sorry, I cannot add files for some reason, here is the link do download:
Last edited by Don B; Jan 2, 2025 at 08:01 PM.
Reason: White text was illegible. Link to suspected malicious software.
Sorry, I cannot add files for some reason, here is the link do download:
When I tried to download the file, my anti-virus prevents the download, reporting that the file is malicious software, so I have deleted the link from your post.
Using IDS/SDD - You need a voltage maintainer
