Sigma Alarm Issue - - Subaru Enthusiast Forum

Sigma Alarm Issue

Thread Tools Search this Thread
Old 10 July 2018, 01:24 PM   #1  
Scooby Regular
Thread Starter
iTrader: (6)
Shane's Avatar
Join Date: Aug 2002
Location: East Sussex
Posts: 465
Default Sigma Alarm Issue

Thought I'd post this in case it's useful to anyone having similar problems.

For a couple of years now I've had a problem where the car wouldn't turn over after disabling the mobiliser when it had cut in, the fuel pump would prime but when the key was turned there was nothing, no clicks, no dimming of the dashboard light, if left for 15 to 20 minutes the problem would go away and the car would fire up straight away. Having had it happen to me twice in a couple of weeks I decided it was time for further investigation. I'd assumed it was the contacts on the relay in the alarm box corroding or having a build up of carbon up after 19 years so set about locating the alarm box and seeing if I could identify and then replace the relays.

First thing I found while gaining access under the dashboard was the blue earth tag in the photo below was loose, this obviously wasn't part of the original loom so nipped that up.

On to the alarm box and removed the screws securing the cover (don't think the warranty seals apply after 19 years so wasn't too bothered about breaking them).

First thing I noticed was that something was getting a bit warm.

Closer inspection showed a dry joint on the biggest relay in the alarm (probably the one that provides the switching current to the starter)

A quick run round with the soldering iron tidying up some of the other joints that were looking a little tired and fingers crossed, I've had no more problems since.

Worth checking if you're having problems with the supplies to either the ignition or fuel pump as these are the 2 circuits switched by the alarm.

Shane is offline   Reply With Quote
Old 10 July 2018, 10:26 PM   #2  
Scooby Regular
Join Date: Jan 2010
Location: derbyshire
Posts: 1,846

Great info.
johned is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Sigma alarm issue Scubarroo General Technical 30 31 January 2016 05:28 PM
bugeye sigma alarm issue Amaya Security 6 08 December 2015 02:47 PM
Sigma Alarm Issue MrNoisy Lighting and Other Electrical 4 08 May 2012 11:55 PM
Sigma Alarm issue BlueBugEye Security 7 14 January 2011 09:41 AM
FAO: Sigma Sam??Sigma Alarm Problemo? ver Lighting and Other Electrical 1 30 August 2005 09:51 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT +1. The time now is 09:07 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.