Reverse Light Short Circuit Mystery: How We Uncovered the Hidden Fault {auto electrics}
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- เผยแพร่เมื่อ 9 ก.พ. 2025
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🔧 About RMS Diagnostics
Welcome to RMS Diagnostics, where we dive deep into the world of auto electrical fault finding. In this episode, we take on a tricky short circuit in a reverse light that leads us down an unexpected path. What seemed like a straightforward issue soon spirals into a mystery-thanks to an updated control module that wasn’t reflected in the dealer's diagrams. Follow along as we reverse-engineer the module and uncover the real source of the problem. It's a journey of discovery, problem-solving, and precision diagnostics that showcases how far expertise can go when standard solutions just won’t cut it.
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Just a bit of advice for anybody else with the similar problem a quicker way to do this would be to replace the fuse with a load for instance if there's a five amp fuse protecting the circuit it is designed to carry five amps so 60 Watt headlight bulb at 12 volts is 5 amps use the bulb instead of a fuse the bulb will light because one of the cables is shorted to ground, i tend to disconnect the positive of the battery and power the bulb directly, using an inductive amp meter clamp all of the wiring loom on each plug until you find the five amps, when you find the wiring loom with the five amps go through each cable one at a time to define the five amps you found a short, five minutes done works every time and arguably you don't need wiring diagram until the last circuit even then you mostly can follow the current trail to the consumer whether its a failed component or a cable touching the body
this is a good method and easy to understand from people who understand things like you and me,I try not to show methods that could me misinterpreted and people could try to use on the wrong type of circuit,I just record some entertainment videos
@@rmsdiagnostics i was not criticising just suggesting a different way
I see that mate it’s a great method,I like a bulb for shorts just I don’t think i explain things well enough to try to give training type content
Perfect example of paying an expert being cheaper than fitting parts till you stumble on the issue. Worth every £ despite what some cheap skates may believe.
exactly
Great show, as soon as you said sit down and get a tea, you got me, love the vids
is this the first one you have watched?
@rmsdiagnostics I've watched a few but I normally follow Ivan on pine hollow auto diagnostics but your nearer lol, I'm 72 now and retired but got an old mg zr and got to replace relay in pektron unit, you never really retire lol, tea time
Bob, you’re a genius mate. I would give up on that and send it to the auto electrician like you if that was my problem lol.
I should have sent thing one to a sparkie😂
Master tech in the making 😉👍
👌👌👌
Been watching you for a while had a fault on my rear lights on my Renault master took it to a specialist who had it for two days and couldn’t find it I managed to find it in 2 hours using your methods thanks
that is amazing to hear👌👌 what was the fault?
This was a phenomenal bit of fault tracing. "Heater doesn't work, so the problem is the headlight.."
And people buy £20 OBD readers believing they will be able to fix their own cars! They fail to acknowledge their vehicles contain a dozen or more computers, all talking to each other, and any one of them can bring up a warning light on the instrument cluster.
Love the channel, and total respect for training someone to learn this complex skill.
exactly mate,£180 dealer code read would not have got far with this one, I like passing some knowledge one👌
Great work Bob and what a nightmare but u got there in the end mate😊
Tell me about it
Excellent video, as I got older I found I had to write things down, as I kept forgetting what I had worked out how different circuits affected each other!
I’m worried about loosing my memory,it’s not what it used to be,I would have to slow down and write more down as I love the job but it’s a worry for sure
Excellent work as always Bob. Alldata is the dogs danglies. Wouldnt be without it. I get referred work all the time because ive got a better scanner 😆 😆 or maybe its just i usedstand how the system works so therefore i can actually test it!!!!!
exactly mate,it’s the Knowledge not the tool
a treat to have two videos this week...this is skill and knowledge at the highest level... ordinary Joe blogs garage would have never ever found that fault with their temu obd reader.. more chance of p*ssing petrol... excellent diagnostic video.. never fail to impress me.
cheers mate
I work at a Peugeot dealer and have tried the same thing. I spent a lot of time because the diagrams didn't match. It was a boxer. Very funny to see others have tried it too
it’s no fun is it mate?
@ no but a good experience in troubleshooting. and really going backwards to find the error.
mine was also the light motor in the right headlight that was shorted.
but fun to see how you found the error. it brought back some memories
Awesome video love the content 👌
Glad you enjoy it! have you been watching long?
@rmsdiagnostics only recently been trying to watch all the videos class content.
That’s unbelievable what the cause did to those which I would have thought to be separate issues
Class job
Thank you 👍
crazy fault
Great diagnosis Bob. I’m really impressed how you explain things in basic terms. Keep them coming mate you and Barney make a great double act😂🥕🥕🥕🥕🥕
he is lucky to have me, your right😂😂
He certainly has a very good teacher!👍
👍👍👍👍👍Amazing, who would have even thought it would have been the headlight.
crazy mate
Absolute brilliant diagnostic Bob. Thanks for sharing 👍 🥕🥕
Glad you enjoyed it
thanks
Welcome
Excellent explanation of how to do a your job
Glad you enjoyed it
I've done loads of these in the last year, mostly the offside ,,
I wonder if they get a little water in?
@rmsdiagnostics it seems to be, the issue, The first one I did I baffled me, as it didt make sense, It wasn't shorted to ground, but the Indicator circuit was shorted to dip beam, Flashing offside headlight. 😂
Nice one mate 👌
cheers mate,how’s it all going ?
@ Aye good mate been really busy struggling to get content made because the weather aint been great recently🥲, your smashing it with the podcast and nearly at 10k 🍻
You’re videos are the bollox Bob. I’m having trouble following the diagrams at your speed though. In fact, I’ve always been slow reading wiring diagrams.,Would you consider doing a video tutorial on reading them. It would definitely help if you have time one day 👍
I’m thinking of doing a live in the workshop soon,possibly tomorrow morning I might be able to slow things down,but yes a nice slow video might help some people but I’m not very good at explaining stuff I’m not invested in as a job but I can try
Madness!
stupid van😂
U r brilliant🎉❤u will increase ure views😅
Thank you so much 😀 I hope so
Top video again thank you …..👍👍👍 If anyone wants to “ loose their screws “ book into a main dealer 😬😉😂😂😂 actually to be fair with vw only 1 was lost , the rest they left on the floor …this was years ago when they said my pollen filter needs replacing.
😂😂
A small electric motor on the head light leveller not a legal requirement in Australia
some do and some don’t here,but xenon lights need self level and washers to clean them aswell
Better than an episode of Murder she wrote! 😊
lol,thank you
@@rmsdiagnostics Thanks for your help on the VXR crank/no start problem I mentioned. The problem was two sensor wires of similar lengths, within close proximity of each other, with the same connector plugs, plugged in the wrong way round. Couldn't have happened if the plugs were different shapes 🤷♂
Crank sensor and knock sensor?
@@rmsdiagnostics Not crank sensor for sure. I don't even know what sensors they are. Been looking on my Haynes pro. One was in the exhaust downpipe. The other, low on the right side of the engine bay in a big rubber hose, like something to do with the intake.
Had a cheeky phone call today like that....Andy you were busy so I took it here....and they fixed it 2 days later had to take it back... they sorted it again 2 days later same problem what do you think?.... i think you should have saved your money and waited till I could get you in!!!
lol,they are great customers like that
You make Sherlock Holmes look like a school dunce👍
😂😂😂 but he can talk propa like I does
Bloody hell Bob..... who'd have thought. 😂😂Well diagnosed🥕
thank you david
Job was a wonky carrot 🥕 eha 😂
😂😂
👍
👌👌
Another good one bob, jobs a carrot lo
thank you
& people wonder why french vehicle electrics are so tricky….
it’s Italian as it’s a rebadged fiat, even worse I hear you say😂
This is why electric is a nightmare … not for you guys though ..
it’s what we do,I wouldn’t find your job easy I’m sure?
@ I’m retired mate, I was a press photographer back in the day ..
Always like seen cars repair and brought back to life ..
With electric, I feel you have have a gift for it .
Keep the content coming mate ..
Well sniffed out. Just goes to show you can't rely on the info sometimes!
thank you mate
Experience is worth its weight in gold mate. If you never knew about the history of those parts and manufacturer changes you'd never have looked at the obscure which would likely have been a lot harder to diagnose that van; the average tech would more than likely have been scratching their heads for days. You said below this is for entertainment but I've learned so much already from this channel.
I’m glad you are picking up some tips mate