Alarm / immobiliser removal .....problems.

[fozzy280472]

Hi all .....seeing as the dashboard is out i thought I'd strip out the old alarm and immobiliser ........what a mess .
The immobiliser was no problem except having to do some surgery to the butchered ignition wiring and a bit of tracing of random wiring .
This brings me onto the alarm .
First off its a Laser line 912 alarm , were these fitted as standard to any TVR S cars ?
The reason I ask is because I've pretty much unwrapped most of the wiring harnesses and am unable to find any cut ins or splices , it's almost like the looms have been made with this alarm controller catered for .
Am I ok to just remove the control box ?
The klaxon has been removed and the plug taped off .
Also , I found this relay next to the controller plug , some of the controller plug wires are directly wired to it , is this standard for our cars or is it part of the alarm system ? .....my basic Italian says it looks like a central locking relay ....after all Laser line was an Italian company .



Now I'm not an idiot when it comes to wiring but this one really has got me scratching my head . The " wiring diagram " for the alarm is ridiculous and the wiring colours on it don't bare any resemblance to what's on the car or plug .
Any advice / tips welcome please .

[Penelope Stopit]

That unit is for the central locking, Laserline Warrington could possibly have been given the job during the loom install, the fact that the correct colour codes have been used for the indicators points to a factory fit (Green/White Green/Red) although the use of crush-on connectors points to a bodge job

There is also the possibility that a previous owner had it all wired into the loom during a dash out job

Have no fear, rip it all out, it is as you see it and you won't have any problems

You could reuse that wiring for another alarm rather than ripping it all out

[fozzy280472]

Cheers for that information , I did notice that the colours appeared correct , the crush on connectors appear to be a crude way of fusing the wiring , they both have 5 amp fuses.
As for ripping it out , I'm not sure where to rip it out to , some of the connections go direct to the fuse board .......I'm not sure I want to just cut the wires and terminate them .
I don't want an alarm at all ....TVR wiring is flaky at the best of times ........
Like I said it's weird .....it actually looks like part of the loom .
Is it just a case of following each cable back from the controller connector to its ending and removing ?

I've never seen so many unused plugs behind a dashboard.....this makes Triumph wiring look like precision electrics ..!!!

[Penelope Stopit]

fozzy280472 said:

Cheers for that information , I did notice that the colours appeared correct , the crush on connectors appear to be a crude way of fusing the wiring , they both have 5 amp fuses.
As for ripping it out , I'm not sure where to rip it out to , some of the connections go direct to the fuse board .......I'm not sure I want to just cut the wires and terminate them .
I don't want an alarm at all ....TVR wiring is flaky at the best of times ........
Like I said it's weird .....it actually looks like part of the loom .
Is it just a case of following each cable back from the controller connector to its ending and removing ?

I've never seen so many unused plugs behind a dashboard.....this makes Triumph wiring look like precision electrics ..!!!

You can cut them at intervals (staggered) and heat-shrink over the ends before taping them back in the loom, by using the staggered cuts method the cables can't possibly short together in the loom and aren't bulky which they would be if all cut close to the same length

or

You can trace them back to their starting points and cut them, if using this method you would need to cut all terminals off where an alarm cable is crimped in with a car electrics cable (some if not all could be doubled up in plug terminals and fusebox/relay terminals

If choosing the above 2nd method you will need to make sure you have the correct plugs and fusebox/relay terminals and crimping pliers.....it's not a good idea to cut the alarm cables out of terminals that have other wires in them as you won't be able to insulate the cuts at the terminals

[fozzy280472]

Cheers for the help on this , yes I'll probably go with the staggered cutting approach.
I think it's just bite the bullet and crack on time !!!

You love a bit of wiring don't you ? ;-)

[Penelope Stopit]

fozzy280472 said:

Cheers for the help on this , yes I'll probably go with the staggered cutting approach.
I think it's just bite the bullet and crack on time !!!

You love a bit of wiring don't you ? ;-)

Yes I love wiring jobs but not the stripping down or rebuilding of vehicles or machines that the wires are fitted in, I love relays and when I die I want to come back as one

Yes do crack on with it, I can assure you that no problems will arise from your work. There is something that crossed my mind, the Laserline alarm may well have 2 cables that work as an immobilisation circuit, if your car cranks and runs with the Laserline disconnected you will have proven that no Laserline immobiliser circuit is in use, if your car doesn't crank or run with the Laserline disconnected you will have proven that there is an immobiliser circuit in use and will have to trace it back to the ignition switch area or more than likely the fusebox area, the circuit will break an ignition,fuel pump or crank wire

[fozzy280472]

I'll have to wait until I start rebuilding the steering column until I try and check for an immobiliser circuit on the alarm .
I removed the other laser line immobiliser and repaired the cut ignition wiring.
The alarm was totally inactive and I THINK the alarm was the alarm and the immobiliser the was the immobiliser if you get my drift ?
I'll have to wait and see .
Cheers for your help .

[Penelope Stopit]

Yes I see where you're coming from and the same as you doubt there will be another immobiliser circuit
Glad to be of some help, have fun

Edited by Penelope Stopit on Tuesday 5th March 21:44

[DamianS3]

If thise brown wires are imobalising things like fuel pump ignition etc wont those need to be reconnected ?

Or did you say that was the other unit?

Just a thought.

Damian S3

[Ceejay73]

I seem to remember something from way back in my misspent youth regarding the cheaper after market alarms.

It was said that removing an indicator lens and shorting the lamp could be a way to "fry" disable the alarm system.

Maybe the crimped in 5 amp fuses were to protect against this kind of attack.

HTH,
Carl.

[fozzy280472]

Hi Damian , on removing the alarm there were no heavy duty feed cables that went to the alarm control box connector so I'm not sure the alarm was in use as an immobiliser on any power feed circuits.
The immobiliser I removed previously , which was not connected to the alarm system , did have a cut in to the ignition and coil circuit .
The fuel pump used to spin over even when the immobiliser was not activated so I think the alarm had no input . Hopefully !!
I'll have to wait and see if I've bu**ered anything up with the electric windows once everything is back together.

[DamianS3]

Cool

[fozzy280472]

Hi all ...alarm out and a mass tidy up / repair of the abysmal mess that is the wiring loom carried out .
Quick question though ....does anyone know what this part of the instrument / warning lights loom is for ? It wasn't connected to anything on dash removal and I'm unable to trace it on the wiring diagrams ....the green is for indication lighting but God knows what the yellow / black is for !!
It's not really important. ..just out of interest really .
Any ideas ?

[GreenV8S]

Green might be the voltage stabilised supply to instruments. Not sure what yellow / black is, but black / yellow is often used for the electric speedo signal.

Any instruments not working? If not, it should be safe to ignore!

[fozzy280472]

Everything was working just fine when I took the dash out , whether it does now is a different matter !!
Like I said , not really bothered but more would like to know out of interest.

[fozzy280472]

Just a quick update , both immobiliser and alarm were removed and wiring cut and capped in the looms , happy to say no problems and everything works !!
Must be a first whilst working on my S !!

[Penelope Stopit]

Nice, very nice