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MK2 Interior Mods & Upgrades The place to chat about performance gauges, shifter knobs, custom interior paint, car seats or any interior upgrades for the 2008-2011 Focus.
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Thread Tools | Display Modes |
02-03-2011, 01:35 PM
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Focus Rookie
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Auto-dimming mirror does not work
Hi!
I have bought a used 2010 Focus SES with auto-dimming mirror, but it does not work at all. I have tried to cover the front sensor and used a torch to beam into the rear sensor: nothing. The corresponding fuse is ok. Do you have an idea what to check? I am an electrical engineer so I should be able to measure the voltage on the plug if I would have a wiring diagram. Thanks! Miklos |
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Focus Fanatic
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02-06-2011, 08:28 PM
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Focus Enthusiast
 
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I can tell you that most electrical engineers make the worst phone line repair guys...
Anyways, at night park somewhere dark, sit in the drivers seat and look in the rearview, and get someone to hold a bright flashlight and shine it through the rear window onto the mirror. With no light hitting the front sensor, and lots of light hitting the sensor facing the rear, it should start to darken slowly to a green colour. The flashlight should look greenish in the rearview.
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02-12-2011, 05:55 PM
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Trying to Focus
 
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^^Good step 1 in the process of elimination. If your mirror doesn't dim in less than a minute, step 2 should be checking the connectors on the wiring going into the mirror, both for physical connection and for voltage (with the car running, a VOM should show nominal system voltage from around 12.6 to around 14 volts).
To go to step 3, you'll need to access Ford's online shop manual (since there isn't a commercial manual out for 2008+ models yet). Talk to your dealer's parts or service techs to get the wiring diagram you'll need to go on to test the connections further upstream.
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All my relations, Christine Sedan Revolution #11 Team Duratec #40 "Straight roads are for fast cars. Curvy roads are for fast drivers." |
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02-13-2011, 08:24 PM
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Focus Enthusiast
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I installed an auto-dimming/compass mirror in my 07 and have installed several of them. Most of what you will find are manufactured by Gentex and the pinouts can be found online.
You should be able to unhook the connector and check to see if there is voltage across pins 1 and 2 easily enough. Also, if pin 3 has power it will disable the auto-dimming function (reverse). Here's the typical pinout... PIN 1 POWER +12 volts PIN 2 CHASSIS, GND PIN 3 REVERSE SIGNAL
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01-06-2013, 09:00 PM
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Focus Rookie
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Quote:
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