Problem with 406 alarm

Discussion in 'Peugeot 406' started by ph12, Oct 16, 2003.

  1. ph12

    ph12 Guest

    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?


    ph12, Oct 16, 2003
  2. ph12

    Jim Mason Guest

    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 but I'm not
    sure if these ECU's have to be programmed.

    Jim Mason, Oct 16, 2003
  3. ph12

    Fraser Guest

    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, Oct 17, 2003
  4. ph12

    Jim Mason Guest

    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 Mason, Oct 17, 2003
  5. ph12

    Jim Mason Guest

    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 (the WJ201W).
    Data sheet at

    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

    Jim Mason, Oct 17, 2003
  6. ph12

    Jim Mason Guest

    Further to that RS Components has an almost exact match

    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 Mason, Oct 17, 2003
  7. ph12

    ph12 Guest

    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
    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

    ph12, Oct 22, 2003
  8. ph12

    Jim Mason Guest

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

    Jim Mason, Oct 22, 2003
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.