Problem with 406 alarm

A couple of time recently on unsetting the alarm first thing in the (cold) morning the LHS indicators have remained on. Setting and unsetting the alarm has cleared it THIS TIME.
Anyone know what to look for? Sticking relay perhaps?

TIA

Peter

 

Sticking relay in alarm ECU. You will pay over £200 for a new circuit board
which has about twenty components on it.

It is known fault with the ECU in early 406/306 alarms. It may get worse.
My 306's box seem to be ok for a year and now the problem is back big
style. In the 306 3 door the box is situated behind the drivers door pillar
behind the panel and could be cleared by slapping the rear wing - now even
that doesn't work :-(

Does anyone know if the faulty relay can be unsoldered so that the
indicators don't flash but still leave the alarm system working?

Got a price second hand of £37 from http://www.sniffydog.co.uk but I'm not
sure if these ECU's have to be programmed.

Jim

 

Don't see why not, the chances are that the only thing it is used for is the
lights, as the relay is used to isolate the alarm from the light circuit.
Would need to take a look at the board or schematics to know for sure and
see if it's doing anything else (which it might be, esp. if it's an
double-pole one).

A better option would be to remove the relay and replace it with the same or
a similar one. A normal electronics repair place should be able to do this
for you, provide the relay is purchaceable.

I've also cleaned relays in the past and got them working again. Pop of the
lid and clean the contacts as well as all moving parts. Use some sort of
alcohol electrical cleaning fluid. This might not be possible, depending on
how it was made.

Good luck!

Fraser.

 

I suspect this relay is used only to flash the indicators.

I can't find anything that relates to the numbers on the relay so a
replacement doesn't look likely.

The relay is tiny and totally sealed so I am going to have a go at removing
it and see what happens.

Jim

 

Problem solved for now!

Took the box back out and decided to carefully cut open the top of the
relay I suspected was causing the problem. This was a very simple relay
inside and right away I knew I was in the wrong one. It is a simple single
pole on-off without any facilty to supply power independently to near and
offside indicators.

The other relay which IS causing the problem is made by Siemens and carries
the numbers V23072 - G1061 - A208 and SZY4HD. A quick search on the net
revealed a possible replacement at www.relays-r-us.co.uk (the WJ201W).
Data sheet at

http://www.relays-r-us.co.uk/webpages/products/rrus_cat/wj201.htm

I'll check RS Components or Maplin to see if they carry a replacement.

However two or three light taps on the sealed unit seems to have freed it
off and it is functioning perfectly. Disconnecting the relay would appear
not to be an option as whilst I was refitting the box the alarm started
sounding a bleep every 30 seconds. When I checked this out it appears one
of the connectors wasn't fully located and wasn't supplying power to the
off-side indicators so this is likely to happen if the relay is unsoldered
from the board.

Further info on the alarm ECU is that it is manufactured by Texton and
carries the following number on the box 962239040-80 and the non-faulty
relay 166NC D012-WB44 9508 A and has a fancy letter `F` on the bottom r/h
corner.

Jim

 

Further to that RS Components has an almost exact match

http://makeashorterlink.com/?P2B912F36

It mentions a snap-off pin on the top of the relay on the data sheet. The
resolution isn't great but i'm sure this hole can be used for washing - is
this correct?

Jim

 

I feel a bit of a fraud asaking a question and then disappearing for several
days leaving everyone else to do the work.....Thanks Jim. Thats very useful.
I wouldn't have thought it was a good idea to wash in situ though....how
would the fluid get out again? I'd take the immersion cleanable to mean that
they are sealed to prevent ingress of anything that would impair the
operation of the relay

Peter

 

I can't answer that but I know mine is working correctly know simply with a
couple of knocks of the offending relay.

Jim