External temperature sensor

[rapport25]

Hi there, my external temperature sensor has decided to play hid and seek. Have a faulty one before which resulted in changing it no problem. Now it has a habbit of reading the temperature one day then just being blank the next any help please? And yes its a D9

[Captain Jack]

If they are not expensive, I'd replace it again before digging further. Could be as simple as a loose connection if it wasn't fitted 100% last time

[rapport25]

Long story but it was replaced with a new complete mirror. Have known them reading the wrong temperature but never working one day and not the next. I think they are around £12 from dealer will buy one and replace that first me thinks.

[Smelliot]

Mine did this. When I brought my old exec, it didn't work and flashed a single dash. One day, for no apparent reason, it started to work, for a whole year. Then a week or two ago it started to show a silly high temp, now sits there with double dash flashing. When I get paid I'm going to the local stealers to get myself a new sensor.
I e-mailed the stealers and they said £14.95 and would have to be ordered after full payment has been taken. Also, some guys on here said the connector for it goes all the way into the door, so removing the door card seems a big job, so just snip it off and solder it on within the mirror.
It'd be nice to see how warm/cold it is outside and to give my climate a chance when it is cold as it doesn't seem to know what to do with the fan speed when trying to defrost the car.

[rapport25]

Thats exactly what i will be doing. Luckly i just remebered i still have the case from old one which was broke of and that contains a new sensor. So i will do as mentioned and solder the new sensor in.

[the406kid]

Is there any more chance of getting more info on this my temperature gauge on the digital display show’s nothing just 2 lines like this “ - - “ would I have the same problem are what??? I have a HDI 406 1999

[teamster1975]

Is there any more chance of getting more info on this my temperature gauge on the digital display show’s nothing just 2 lines like this “ - - “ would I have the same problem are what??? I have a HDI 406 1999

Right. There's a thermistor in the base of the passenger wing mirror. If it goes faulty it will give duff readings; if it goes open circuit it will be as if there is no sensor plugged in and give the two dashes. Has the temperature ever shown correctly since you had the car?

[the406kid]

Is there any more chance of getting more info on this my temperature gauge on the digital display show’s nothing just 2 lines like this “ - - “ would I have the same problem are what??? I have a HDI 406 1999

Right. There's a thermistor in the base of the passenger wing mirror. If it goes faulty it will give duff readings; if it goes open circuit it will be as if there is no sensor plugged in and give the two dashes. Has the temperature ever shown correctly since you had the car?

No it has never shown nothing it was like this when i bought the car, i also tryed to check but and i dont see a thermistor in the base of the wing mirror, maybe my car wasnt fitted with one could this be a possiblility???

[the406kid]

Any chance some one could tell me are even show me a diagram are something to check to see is the thermistor sensor plugged in, maybe it is just sitting unplugged, Thanks

[rapport25]

It to bloody cold But from memory.

You remove the black plastic triangular shape cover from inside the car with a flat blade screw driver.

I believe there is 3 star headed screws I think T10'S in size behind there. Undo all three.

Also a little round black plastic cover. Which has a torque screw there also T10 in size i think.Undo this one also and you should be able to pull the mirror away now.

As you do you should see a multi connector clipped to the door behind which has the wirrig for the motors heated element and the temp sensor. Just make sure its plugged in correctly as they can come loose.

If its pluggerd in correctly after turning igniton back on and still does not work. I would say temp sensor is knackered.

Hope this helps Rappy

[the406kid]

It to bloody cold But from memory.

You remove the black plastic triangular shape cover from inside the car with a flat blade screw driver.

I believe there is 3 star headed screws I think T10'S in size behind there. Undo all three.

Also a little round black plastic cover. Which has a torque screw there also T10 in size i think.Undo this one also and you should be able to pull the mirror away now.

As you do you should see a multi connector clipped to the door behind which has the wirrig for the motors heated element and the temp sensor. Just make sure its plugged in correctly as they can come loose.

If its pluggerd in correctly after turning igniton back on and still does not work. I would say temp sensor is knackered.

Hope this helps Rappy

Thank for this step by step guide, I just did it step by step and i had no problem loosing it down, but then I hit trouble, I can see the connector are I hope it is the rite connector but no wire’s are plugs are plugged it to it and there is no spare plugs are wire to plug in, see pictures below hopefully im in the right area

Is this the plug i should be looking for???



below is a pic of the passenger's mirror of the car as you can see there are no plugs coming out of it

[teamster1975]

You've got manual wing mirrors so there's no temp sensor

[the406kid]

You've got manual wing mirrors so there's no temp sensor

Ragin, but in the car there is a temperature meter on the digital display, would it had electric mirror's and maybe it got broke and was replaced with manuel mirror, is there no way i could still get a sensor and plug it in????

[rapport25]

Pleased my instructions helped

Sorry you will need to buy an electric one. Have a look on e bay.


Rappy

[teamster1975]

You've got manual wing mirrors so there's no temp sensor

Ragin, but in the car there is a temperature meter on the digital display, would it had electric mirror's and maybe it got broke and was replaced with manuel mirror, is there no way i could still get a sensor and plug it in????

The connector for electric wing mirrors is 12 pin off the top of my head; that 2 pin socket you've got isn't hooked up to anything.
When I retro fitted 'leccy mirrors I had to get the correct socket from a breakers & run my own wires into the car; earths aren't a problem, it's just getting your motor live feeds inside, heated mirror element +ve & the two temp sensor leads.
You could potentially get a temp sensor from a scrappy and run a pair of wires inside the car to the back of the trip computer; I've only done it on a D8 though.