Alarm sounds off but won't stop with key fob - theMGZR.co.uk :: MG ZR forum
Go Back   theMGZR.co.uk :: MG ZR forum > General > General MG ZR Discussion
Register FAQ Calendar Mark Forums Read Advertise

Reply
 
LinkBack Thread Tools Display Modes
Old 27-01-2019, 12:51   #1 (permalink)
 darbon
*Newbie* Handle with care
 

Posts: 1
Location: Lincoln
Drives: ZR 105 Trophy SE
Join Date: Apr 2013
iTrader: 0 (0%)
Thanks: 0
Thanked 0 Times in 0 Posts
darbon is on a distinguished road
Alarm sounds off but won't stop with key fob

My lads ZR160 (04 plate) alarm started to sound off without warning last night and wouldn't turn off nor open the door with the fob (all has been OK with the car as he used it yesterday afternoon and regularly for commuting to work).

Tried various thing (removing fuses, changing battery in the pektron fob, resetting it) but all to no avail - alarm still sounding and no response from the car at all.

Disconnected the battery and left it off all night. Went to it earlier this morning and found (in daylight) that one of the leads from the battery to chassis had come away!

Repaired it and re-attached it to a cleaned area on the chassis, put brand new 500cca battery in to car - connected up and alarm sounds straight away and keeps going - cannot turn it off with either of the 2 fobs!!

Any suggestions as to what we can do next will be gratefully received!!!

ps Battery has been disconnected again for now.
darbon is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 27-01-2019, 19:06   #2 (permalink)
Senior Member
 

Posts: 1,355
Location: Lincolnshire
Join Date: Sep 2004
iTrader: 0 (0%)
Thanks: 1
Thanked 71 Times in 67 Posts
Man in the Car will become famous soon enoughMan in the Car will become famous soon enough
Firstly, just to verify whether it is the alarm sounder/siren (mounted on the bulkhead just to the right of the expansion tank) that is sounding continuously, or the horn?

The horn sounding continuously is almost always due to a failed i/c in the Pektron SCU, and it is usually necessary to disconnect the battery or remove the horn fuse to shut it up. Obviously, you then need to remove the SCU from behind the air con evaporator at the back of the dash centre console, with is a bit of a challenge in itself! The SCU can then be repaired (contact Paul Brown at https://www.technozen-electronics.co.uk/). For more information on the Pektron SCU, I would recommend a read of this thread over on mg-rover.org: https://forums.mg-rover.org/how-do-i...cu-bcu-384938/

If it is the alarm siren, then it is likely that either the sounder unit has become water logged and needs to be dried out or replaced (the security shear bolts holding the guard casing over it can usually be removed with careful use of Mole grips); or there is a short in the wiring between the body and the tailgate - the wiring frequently gets chafed where it passes through the rubber boot at top right of the tailgate opening. Pull the boot back and thoroughly check these wires and repair if needed.

The alarm sounder has its own back-up battery within the sounder unit, and once triggered will continue to sound and will not normally stop if the main car battery is disconnected.
Man in the Car is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
alarm garry_noble Electricals 0 26-09-2009 17:31
Problem with the alarm iancampbell General MG ZR Discussion 7 25-02-2009 17:19
alarm keeps going off m_kne Electricals 4 21-02-2009 15:57
Ive had enough!! New Alarm please! richcanning04 Electricals 8 30-12-2008 09:36
Alarm Keeps Going off in Heavy Rain !!! MG ZR MK2 Problems and Miscellaneous (Sponsored by Parts Gateway) 7 22-12-2008 14:05


All times are GMT +1. The time now is 01:31.



Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©2004 - 2014 theMGZR.co.uk Ltd 06371623

The theMGZR.co.uk logo is registered with the UK Copyright Service: 285179

 

Garage vBulletin Plugins by Drive Thru Online, Inc.