General Pektron SCU/BCU - Page 4 - MG-Rover.org Forums
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post #61 of 297 (permalink) Old 02-10-2011, 20:01
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Originally Posted by simesr9999 View Post
Hi
I have a 2005 tf problem where my alarm wont sound the hazards flash but no horn. the horn works fine in everyday use but nothing when alarm is activated. Wiring diagrams show a power sounder with battery back up, but the manual talks about it sounding the horns under the bonnet. Any help/info would be much appreciated, thanks.
The BCU models use a separate sounder with battery backup as you stated.

Soggy sounders damaged by water ingress is common on other models, not sure if the TF suffers the same fate.
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post #62 of 297 (permalink) Old 03-10-2011, 19:01
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Thanks for the reply. do you know where they hide the sounder?
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post #63 of 297 (permalink) Old 03-10-2011, 19:22
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roverman
Thanks for the reply. do you know where they hide the sounder?
Probably under the bonnet, just looks like a black metal box.
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post #64 of 297 (permalink) Old 11-10-2011, 11:35 Thread Starter
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Fujitsu have now discontinued manufacture of the white FBR512/522 series relays.

I have managed to source an alternative, lower cost too, which I'm happy to pass on to .org Supporters.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.

Last edited by technozen; 16-10-2011 at 18:05.
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post #65 of 297 (permalink) Old 16-10-2011, 17:29
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Wonderful work there Paul!
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post #66 of 297 (permalink) Old 18-11-2011, 12:12
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Smile Cl fault

Hi Technozen My car 2005 MG TF 135 All locks o.k with the remote, setting alarm & immb. When I go to get in the car, it disarms the immb & alarm, but will not open the drivers door. I can unlock this with the key, engine starts o.k. However the passenger door will not open at all, inside or outside Would it be possible for you to put my car on your computer, to try and find out what has gone wrong? I have been told by MG that it could either be the Pektron unit or the CL unit in either door your help would be appreciated regards Ken
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post #67 of 297 (permalink) Old 18-11-2011, 17:00 Thread Starter
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It sounds like the passenger door is superlocked with a failed C/L motor and the drivers door has a C/L fault.

I would be very surprised if this were the case, what are the odds on both door mechanisms failing?

Given their track history I would be swayed towards faulty relays in the Pektron SCU, certainly easier to change them than the door mechanisms!

I don't have diagnostics for the SCU, but in this situation the fault finding could be done with just a multimeter.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #68 of 297 (permalink) Old 18-11-2011, 19:33
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Hello. Help, to me it is necessary dump 93LC66 scu
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post #69 of 297 (permalink) Old 19-11-2011, 08:53
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Smile CL failure

Hi Technozen many thanks for your reply And if it's what you say it may be, could you replace the relays for me. How long would this take ? I have the car booked in with MG in Eastbourne on Monday 2.00pm for a diagnostic check on their computer and will let you know what the outcome is regards Ken
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post #70 of 297 (permalink) Old 21-11-2011, 13:01
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Smile CL failure

Hi Technozen I cancelled the appointment with the garage, as this morning drivers window, would not work, but passenger side o.k. I am pretty sure now that it's relay problems I have seen some on Ebay and I am going to buy them How easy a job is it to replace them, I'm going to buy 5, is it worth replacing them all? regards Ken
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post #71 of 297 (permalink) Old 21-11-2011, 17:43 Thread Starter
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Always easier to replace the relays in one go, Sods Law applies to the SCU relays!

The SCU is easy to remove on the TF as it is located behind the centre console and access is via the console panel in the passenger footwell.

I would recommend that you disconnect the battery, before you do ensure that the immobiliser is off (dash LED not illuminated) as this will make life easier when you re-connect the SCU.

You will need a good soldering iron and either de-solder braid or a de-solder pump to remove the relays.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #72 of 297 (permalink) Old 04-12-2011, 16:44
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Hi all im having alarm faults on my rover streetwise and was told it could be the bcu,scu where is this situated? and how much woulkd the relays in this to be replaced.cheers in advance.
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post #73 of 297 (permalink) Old 04-12-2011, 16:58 Thread Starter
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The SCU is located behind the aircon evaporator casing which is accessed by removing the glovebox.

Faulty relays won't be the cause of your false triggering.


Have you also checked the tailgate wiring loom?

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #74 of 297 (permalink) Old 04-12-2011, 20:19
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Yes tech everything looks ok nothing is snagged or broken wires underneath the rubbers,im at a loss on what to do now.
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post #75 of 297 (permalink) Old 04-12-2011, 21:27
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Intermittent wiper - relay fault?

Hi
Bought an 05 ZS 120+ a few days ago, love the car, one or two minor electric faults, and I think I'm now in the right place... Heater fan doesn't work on 1 or 2 but fine on 3 and 4 - I've bought new resistor from eBay; electric mirror adjustment only turns mirrors down, not back up; and finally, no intermittnet wipe. It's this last I'm looking for help with... Horn, central locking, electric windows, alarm, fog lights all seem to be working OK (key fob needs to be right beside the car to lock/unlock but I assume that's a battery gone flat and will replace). My question is, is the intermittent wipe issue a relay issue? Wipers work fine on both other speeds... And if it is the relay how to get hold of replacements?

Many thanks,

Dan
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post #76 of 297 (permalink) Old 10-01-2012, 21:11 Thread Starter
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Your intermittent wiper problem will be caused by a faulty relay.

I can supply replacements if you need one.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #77 of 297 (permalink) Old 18-01-2012, 13:36
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This Pektron unit is really getting me down now. Our central locking one has failed again. The thing was I used another Pektron relay out of a YWC001541 doner.

I have a spare Fujitsu unit that I bought off you that I can fit, the other one was used for the drivers window when that wouldn't go up.

Do the new units you have have a higher contact rating than the Fujitsu's. I think I read on ebay that the contacts are rated at 25amp.

I may bite the bullet and replace all 5 as our BCU is starting to look like a patchwork quilt lol



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post #78 of 297 (permalink) Old 18-01-2012, 13:43
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ic replacement

Hi Mate i bought a car of my step fathers brother last here i have just mailed you on ebay before i bought it off him he replaced all 5 scu relays which he bought off you but now the horn stuck on i mailed you thinking it was the relay gone again but after being guided here from your listing im guessing it is the ic that needs replacing is this correct? how do i go about getting my hands on 1 and how hard a job isit to do if i pull the the scu out will it need programming or anything again any help would be much appreciated
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post #79 of 297 (permalink) Old 18-01-2012, 18:00 Thread Starter
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@ harbottle

All of the relays, irrespective of manufacturer, have the same ratings.

The usable rating is 25 amps @ 14 volts.

They will switch 35 amps maximum and carry this current for 10 minutes and the
inrush (surge) current rating is 60 amps, although these ratings are given for the relays being tested in a laboratory environment with strict voltage/time parameters.


@ big_ieu

The relays always fail in a condition where it will not turn on and the associated circuit does not operate.

As you have found the horn operating all of the time is because the IC controlling it has failed and is powering the relay constantly.

If you look at the very first post in this thread you will see that I have labelled the IC's in one of the photo's, in the case of your fault it is the IC marked D.

It isn't an expensive item and is available from RS and Farnell as well as many othe component suppliers.

As it is a surface mount IC you need to be careful when removing and refitting it.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #80 of 297 (permalink) Old 19-01-2012, 12:30
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you wouldn't happen to know or the manufacture or part number by any chance mate rs say i need to get that for them to match it
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