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3rd April 2016, 13:21 | #1 |
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Brake lights stuck on - help please
Hi, I hope I can get some help with 52 Connie CDT, I've looked at previous posts and tried suggestions but to no avail. The problem is a common one, my brakes lights won't go off, inc the HL one The problem originally started a year a go and was intermittent. I originally thought it was the ratchet mechanism slipping so I removed the dash by the pedal s and periodically reach under and push it forward with which seemed to work.
In January I decided to buy a new switch from a Landrover specialists which had the same part no as Rimmer Bros and fitted it to find that the switch didn't work (or at least that's what I thought) I refitted the original part and everything went back to before. After some to and fro I got a replacement switch, fitted it again to find that this didn't work however this time neither does the original part. This is what I've done so far, I've checked fuses 7 and 13 , they are OK BLs still on, I've unplugged the switch totally, BLs still on , I've removed the LSM which does turn off the lights as expected but on refitting it the BLs are still on. Any suggestions?I'm thinking maybe the wiring is at fault between the loom and the connector, so contemplating removing the pedal box and checking this, but I'm still perplexed by the point that the lights stay on even with the switch disconnected!!! I read a post to say that usually they should go out? Also the lights stay on with the fuse removed? Surely that the power source for the switch? Last edited by Rennie71; 3rd April 2016 at 13:31.. |
3rd April 2016, 16:28 | #2 |
Posted a thing or two
Rover 75 saloon Join Date: Nov 2012
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Possibly a t4 session would help ?
Regards Chris |
3rd April 2016, 17:14 | #3 |
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Yep, this is a pain, mines intermittent and I have no solution, apart from replacing the switch. I'm forever looking in the mirror whilst braking at night to see if I'm getting a reflection from road signs on opposite side. I'm just lazy I guess, lost the reversing lights and sensors the other day, but they're working again now, will get a switch for a sunny day
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5th April 2016, 18:32 | #4 |
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Hi SD1too not sure how I check the version of fuseboard it's a preface lift version , with 3 rows of fuses which run to 40'something , I've tried removing fuses 5 and 8 too which were labeled but still the lights remain on.
I've not had an opportunity to test continuity with my multimeter yet , was gonna check from the switch connector to the fuse, earth and LSM not sure how I test the feed to the ECU unless I unplug the ECU and locate the wire . Is this strand of loom a harness that separates from the loom? Do you think it might be a earth problem? Thanks |
5th April 2016, 19:21 | #5 | ||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
Quote:
Simon
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5th April 2016, 19:52 | #6 |
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75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007
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Sounds like it's possibly the LSM that's faulty
Had one last week that was doing the same, fitted and configured a replacement to the car problem solved If you have access to a spare you could try it and see if that does the trick Russ
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3rd April 2016, 17:07 | #7 | ||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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2002 diesel
Quote:
The brake lights circuit is not straightforward. For a start, the brake pedal switch is an electronic Hall effect device whose output actually holds the brake lamps off. So from your described symptoms, the fault doesn't lie with the pedal switch, unless it's maladjusted. Quote:
You can check the power supply to the brake light switch with a multimeter: Pin 1: light green/purple = +12v (auxiliary position on ign. sw.). Pin 2: black = earth Pin 3: purple/green = connection to ECM (this appears to be for cruise control disengagement) Pin 4: green/purple = connection to LSM (which controls the lamps). Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 3rd April 2016 at 17:11.. |
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28th August 2017, 09:28 | #8 |
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I've ordered a genuine MGR one from eBay (from ex Rover dealer).
Hopefully that will sort it, but I have a feeling that it's not the switch that's the problem now. Sent from my Redmi 4X using Tapatalk |
28th August 2017, 20:23 | #9 |
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Hope you have found an alternative source for the switch
Let us know if it works as it should when you fit it, will be very surprised if it isn't the switch as what you have said is exactly how mine was before replacing with the one from Rimmer Bros.
Amazing how such a simple fault can cause so much aggravation. |
30th August 2017, 20:52 | #10 |
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Well I have an update...
I followed bigblue75's advice and bought a genuine MG Rover part (XKB000022A). I've fitted it and the brake lights now work as they should. Sir, I am in your debt! The first switch I bought was from Eurocarparts. I will be getting in touch with them to tell them the part doesn't work with our cars. Thanks again everyone - I'm not sure what I would have done without the help of this forum. I'm now going to have a celebratory beer! |
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