O

Oldee

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• Oct 14, 2013

• #1

Hi all,
Help.
Does anyone know the location of the sensors on 54 plate Punto 1.2 Active sport, 3 door. The red warning light - a door symbol - is continually on when the ignition is on - unless I remove the plug from the door lock mechanism
I can't find any sensors on the doors that would trigger the warning lamp.
Also the doors won't lock, as it thinks one of the doors is open.
I have been all over the doors, I even have the drivers door interior panel removed, but can't trace the sensor. I'm thinking there may only be a boot sensor, but need some informed input.
Cheers

 

fingers99

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• Oct 14, 2013

• #2

You might -- I'm not sure on canbus cars -- find that the "door open" signal originates from the little switch (often on the bottom of the A post) which swtiches on the interior lights.

 

a1ant

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• Oct 14, 2013

• #3

Hi,

The door open switch is a small microswitch located in the latch module on each door. There is one in each door AND the boot lid.

Unfortunately there is no simple plunger type switch as there used to be on older cars as Fingers describes, the switch is built into the door lock mechanism itself.

Also check the door loom for chafed/ broken wires, as this is often the cause.

Have yo ascertained which door it is thats causing the problem yet?

Alan

 

Last edited: Oct 14, 2013

OP

OP

O

Oldee

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• Oct 14, 2013

• #4

Hi,
Suspect it is the driver door as it had dropped slightly due to a tear in the metal around the top hinge. This has now been repaired
I have looked at the pins in the connector by the check strap and they are all OK. However, not check the wiring through the rubber sheath to the socket. no damage visible to the protective sheath.
Had the lock mechanism out and mechanically it is all fine. Is there any way to check the pins on the lock mechanism for continuity, with the plug removed ?
The Red door warning light does not function with the plug removed and the lock also works fine with the plug out, obviously just no central lock feature.
Cheers

 

Ziggy122

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• Oct 14, 2013

• #5

Right jumped onto Autodata for you

The 2004 1.2 8v
Lists the doors having 6 wires

Pin 1 and 2 are the motor that moves everything
Pin 5 is the earth wire
Assuming pin 6 is the Door open and door closed
Pin 3 and 4 are the doors locked - door unlocked signals

Pins 3 4 and 6 are all earthed via pin 5



Ziggy

 

OP

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Oldee

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• Oct 15, 2013

• #6

Thanks for the wiring diagram Ziggy, that make it much more clear. I will check out the switch with my digital meter. I will get back with the result.
thanks to everyone for help.
Allan

 

S

s and b

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• Oct 15, 2013

• #7

99/100 its the micro switch in the boot
with ignition on and boot open lock the mechanism and with a small screwdriver close the mechanism some more,now look to the dash see if light out this usually confirms this switch faulty
cheapest remedy remove black cover on tailgate disconnect wire to boot lock
remember to shut boot before a journey

 

F

flisko

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• Jun 12, 2014

• #8

s and b said:

99/100 its the micro switch in the boot
with ignition on and boot open lock the mechanism and with a small screwdriver close the mechanism some more,now look to the dash see if light out this usually confirms this switch faulty
cheapest remedy remove black cover on tailgate disconnect wire to boot lock
remember to shut boot before a journey

Click to expand...

aha

 

F

flisko

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• Jun 13, 2014

• #9

not the boot sensor, and red door light is still lit on the dashboard, so its some door that is sending bad signal

 

oldhammer

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• Jun 13, 2014

• #10

flisko said:

not the boot sensor, and red door light is still lit on the dashboard, so its some door that is sending bad signal

Click to expand...

take battery lead off for 1 hour -re set bcu,

or look in door looms for broken /chaffed wire's., unplug door loom to test
which side is at fault,

 

F

flisko

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• Jun 13, 2014

• #11

oldhammer said:

take battery lead off for 1 hour -re set bcu,

or look in door looms for broken /chaffed wire's., unplug door loom to test
which side is at fault,

Click to expand...

you are quite smart, havent thought about that myself
but wont unplugging door wires still cause the light to be on?

 

Last edited: Jun 13, 2014

PuntoHowTo

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• Jun 14, 2014

• #12

A1ant answered this very well at the top of this thread.

Essentially It will be one of the doors (front doors if a 5door car)

One of the switches as described

 

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flisko

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• Jun 14, 2014

• #13

final conclusion:

was unpluging door wires per recommendation by odhammer to see if the red door light would go out ,but it didnt, then i went back to the boot and unpluged wires and light went out, so s and b was right by saying its the switch in the boot door lock, i have just cut the black cable from it and problem solved

 

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smetin

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• Jan 17, 2019

• #14

a1ant said:

Hi,

The door open switch is a small microswitch located in the latch module on each door. There is one in each door AND the boot lid.

Unfortunately there is no simple plunger type switch as there used to be on older cars as Fingers describes, the switch is built into the door lock mechanism itself.

Also check the door loom for chafed/ broken wires, as this is often the cause.

Have yo ascertained which door it is thats causing the problem yet?

Alan

Click to expand...

Alan, apologies for hooking up,
interior lighting of my fiat punto mk2b no longer reacts to the doors. Not on any door. I can turn on the lamp by pressing it. Do you have any idea what the problem may be? I can not imagine that all micro-switches are broken! When opening each door there will be a report on the dashboard, so that works. Interior lighting unfortunately not. Thanks in advance for your response.