406 indocators and alarm problem

Had this very intermittent problem for a while (over 6 months since last
time). When it happens the indicators flash when you press the lock button,
but not when you press the deadlock button, but you can hear the locks
working. Then when you unlock, you can hear the relays operate, but the
indiactors don't flash. Also, when you operate the turn signals, all
indicators flash regardless of which way you indicate. Often normal service
can be resumed by disconnecting and reconnecting the battery a few times.
Has anyone come across this?

TIA

 

I don't know if this information will help. My 406 does not have an alarm
fitted and the locking has always worked exactly as you describe. The only
time the indicators flash is when you press to lock. They never flash on
deadlock or unlock. Probably no help but it may give you a clue.

 

All the indicators flashing regardless of direction can be a sign of a bad
earth on one of the corners.

Ron Robinson

 

Thanks Keith, but I don't think so. I'm looking for some pointer as to where
the alarm circuit, indicators and possible hazard warning lights come
together such that maybe a stuck contact on a relay could cause the left and
right indicator circuits to be permanently connected, The change in behaviur
of the lights when setting and unsetting the alarm isn't a problem, just a
symptom. normal behaviour is all indicators flash when lockiing the car and
they flash again if you set the alarm. Then when you unset it from the
alarmed state only, all indiactors flash rapidly about 4 times. This isn't
happening, but you can hear relays operating so I wonder if there is a feed
missing again beacuse of a stuck contact.

Peter

 

But wouldn't that be at reduced brightness and altered flash rate? Also this
goes hand in hand with the loss of flash on alarm set and unset.

Peter

 

Not neccesarily

Puzzling, I admit. Sounds as though you are expecting a combination of
circuits with a bad earth somewhere to behave logically. Actually it does,
but it makes up its own logic...

Ron Robinson

 

Hi Ron,

Having trouble actually finding the earthing points to check...any
suggestions there? In the meantime have removed bulbs in turn, thus taking
that earth point out of the circuit, ending up with both rears out then put
those back and took both fronts out. Behaviour still the same; both sides
flashing regardless of which way the flasher switch is set.

Any other suggestions?

Peter

 

Sorry, I was replying theoretically (and from past experience on other
cars) rather than practically as I don't have a 406 myself. You could
perhaps try bridging from the earth part of the bulbholder to a known good
earth in each corner in turn to see if that makes any difference.

Ron Robinson

 

Got in the car this morning to find that, although my efforts made no
difference last night, the indicators are now working correctly, but the
flash on setting and unsetting the alarm are still missing (that's the first
time that's happened). I need to look at a proper circuit diagram, but so
many things show up as black boxes these days. I found some diagrams at
http://peugeot.mainspot.net/wiring406/index.shtml, but they don't show turn
signals or alarm.
I imagine that there are relay contacts in the alarm ECU that supply 12v
directly to the lamp circuits down stream of the turn signal switch. I've
had one side or the other stay lit occasionally (i've seen posts where
changing the relays is mentioned) , so guess the relays sometimes stick on
and perhaps 2 stuck relays with no 12v applied could account for the all
lights flashing symptom, but I'm having difficulty imagining what
combination of relays could account for the flash when the locking, but not
when deadlocking