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Discussion Starter · #1 ·
Hi

I have problem because I have tension on the fuse No. 50, but after I turn on heating the rear window on the plug at the mirror I do not have tension on heating wire. Is there somewhere still some fuse or switch?

Thanks for any tips[cheers]
 

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I'm not sure how you're using the word "tension" here. Tension usually refers to mechanical force between 2 objects like if a weight was hanging on rope- then the rope would have tension on it. It can also be used to describe emotional problems between people- like my wife lost the rent money at the casino so we are experiencing some tension at home.

For electricity there are 2 terms that are applicable here: continuity and voltage. Electrical continuity refers to how all electrical circuits must be in a complete circle from positive to negative through a resistor in the simplest form. Fuses, for example, should show continuity on a tester through the 2 sides of the fuse. That's how you test fuses to be sure that a fuse is good in case the fuse is damaged in a way that you can't easily see the break in the element.

Voltage or power is measured at the device, but can be misleading sometimes. For example, if you remove a fuse and test for power at the fuse socket- you'll always find that on one side of the fuse socket. The other side, where you do not find power to earth with a tester, is the side that goes to something like your heated mirror switch.

I would assume there is a relay of some sorts either under the hood or under the dash for the heated mirrors. When I've tested things that have broken on cars in the past I generally find the problem to be the switches. That's the first thing I'd test. If the switch has 2 connection points, then put your tester on those 2 points, activate the switch, and look for continuity at the switch. If you don't find it- then you've got a bad switch, and you don't even have to search for the relay or a wiring diagram.

Good luck!
 

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Trump 2016
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if you dont have svt and its a zx3 thats why they dont work zx3 does not come with heated mirrors its 2 different wire harness
 

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Discussion Starter · #5 ·
TY whynot think whynot, yes i mean voltage ( in europe in translation it sounded ok :p )

if you dont have svt and its a zx3 thats why they dont work zx3 does not come with heated mirrors its 2 different wire harness
I have 5 wires in the beam reaching the mirror, so I think 4 and 5 should be for heated mirrors?

It is 2.0 zx3 se from 2005r.


Can anyone have a wiring diagram Heated mirrors? Because I did not find in manual the switch responsible for the heating.
 

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has a screw loose
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If all your fuses and switch are working , on the hatchbacks look inside the rubber boot with the wires where the hatch raises up and down . Could be a burnt or skinned wire inside the boot.
 

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Pin 4 & 5 yes, you are sure you have voltage to the rear window, do you have the problem on both sides? Thre is no more switches involved , it gets pwr from the rear window defrost relay then to the 7,5a fuse, then to a connector on the A pillar, from there its split into left & right side, I assume the movement of the mirrors work...
 

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Reference: 2004 Ford Publication: Focus Wiring Diagrams. USA market

Right mirror: pin 4, Green/Orange .35mm goes to Rear Window Defrost
Right mirror: pin 5 Black .35mm, goes to Rear Window defrost
Left mirror: pin 4 Green/Black .35 mm goes to rear window defrost
Left mirror pin 5 Black .35mm goes to Rear Window Defrost

All these Black wires go to ground

The other two wires are joined together to a Green/Blue .35mm wire that then goes to a 7.5 Amp fuse labeled F2.50. Fuse box inside the car by driver, labeled "Power Mirrors"

While the heated mirrors turn on when you turn on the rear window defroster, the defroster is on another circuit[fuse]

It would seem to me that the mirror heater wires do NOT go back to the rear. [But I could be wrong]

Continuing on with the circuit description:

The fuse previously mentioned is connected to the fuse for the rear window defroster which is fuse F2.49 25 Amp

These two fuses go to the Rear Window Defrost Relay contact which is labeled C2021 this is also in the same fuse box

The other contact goes to fuse F1.7 40 Amp in the engine compartment

To troubleshoot:

get a voltmeter:
is there ~12volts on fuse F1.7?
If yes
is there voltage on fuses F2.49 and F2.50, while turning the rear defroster on and off? [You want to see the voltage go on/off in sync with the defroster switch]

Maybe the heater element burned out on only one mirror

Does your rear defroster work?

I see you have a 5 door car

There are tremendous problems with the umbilical goes to the rear hatch. the wires inside will cracked, short, break apart . All INSIDE the umbilical

If you are still stumped [cannot figure this out] then send me a PM with your real Email address and I will send you scans of my Ford Wiring manual. Understand it is 20 mm thick So I will only send you concerning this circuit

In the fuses that I have seen there are bare spots on both sides of the fuses so be sure to measure both sides of the fuse
 

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Discussion Starter · #9 · (Edited)
rear defrost work's ok, but i don't have voltage on both side mirrors. Now i need go to sleep ( just got back from night shift at work) i hope that the weather will be ok, so i will use voltmeter and look at the read window wire ( mayby ground from mirrors somewhere is broken)

and i have 3 door version

Edit:

Ok, i have voltage on fuse f2.49 and f2.50, but I took out the fuse went out fuse f1.40 Interior lamps switch off.
 
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