Question about Mitsubishi Endeavor

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2006 mitsubishi endeaver ECU goes out withing 500 miles of being replaced. has had 8 ECUs in 4 years and no high beam head lights when it goes out. What is cause?

UCU that controls head lights goes out with in 100-500 miles after replacement. 8 have been installed so far anbd needs new one now. No high beam when it =goes out and low beam lights are 50% of normal. What will cause this?

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When lights go dull it means either a bad earth / high resistance to current flow or the current for the lights is being diverted before it gets to the lights . What I mean is that there would be 12 volts at the power wire to the lights and very low voltage at the earth wire from the lights as the resistance of the bulb elements reduce the current flow . Now if there is a place that is draining off the 12 volts before it gets to the bulbs say to 7 volts then there is less current available to properly work the lights and they will be dull. A bad earth will effectively add extra lights into the circuit and increase the current flow as it is like hooking lights up in series(P ve to N-ve to pve to neg to pso to nev and so on instaed of adding lights in parallel ( all pve on one terminal and all Nve on the other . If you keep having troubles with the unit burning out then check the earth points and if you are running extra lights or lights with higher current draw ( example 65 watt bulbs to 125 watt bulbs ) with out running a relay in the circuit will cause problems as the unit is not designed for that sort of current draw.. The units will be good to start with but the killer will be too high a current draw through it from some of the faults I have outlined . BY using a multimeter and an amp meter in the circuits you may find the faulty bit

Posted on Mar 21, 2014


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SOURCE: High-beams not working

U are going to have to replace the mulitfunction switch if the bulbs are not the problem

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SOURCE: replacing low beam head lamp 2006 trailblazer

with my 2003 gmc when you open the hood and look at the top of the head light assembly you see two rods that kinda look like the end of an allen wrench (hard to explain in words) you have to turn them a quarter turn to unlock them and then pull them straight up and out. they are pins that hold the headlight assembly into the truck. when you remove them the whole assembly will then come out forward and you can change the bulb. the hard part if aligning the holes and getting the pins back in. dont forget to turn the pins back into the locked position after. hope this helps as my truck is a little older.

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SOURCE: 2000 impala-low beams don't work but high does

sounds like the problem is the dimmer switch, get a price on the dimmer switch. If you have to, get one at a junk yard . It's cheaper.

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SOURCE: replace low beam head lights on buick allure

Open hood, look on top of head light assm, you will see a bolt or screw, these hold assm in. remove, and pull out assm. Turn lock collar, remove old bulb, install new, BUT DO NOT TOUCH GLASS END OF BULB WITH YOU HAND, the oil from your skin will make the bulb explode when it is heated.

Posted on Feb 04, 2010

SOURCE: Both low beam head lights won't come on. I've

You only install a new fuse, if the old one blows
Why is it that, something, no one understands
A fuse does not make for a repair,it protects a cuircuit, from a current overload,if you got any headlights,you can forget even checking the fuses. (common sense)
If you got hi beams on both lights,why would you think,both low beams went.

Check out something common,hi/low beam selector switch,may be something else,but surely a good place to start
Unplug one head light and use a volt meter.
Without the ability to understand basic electricity, and use a meter,you may as well leave the hood closed

Posted on Nov 08, 2010

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No high beams, no indicator light, no daytime running lights (related?) HB fuses good, dimmer relay good, dimmer switch replaced (works), all wiring looks intact, bulbs good.

This is reminiscent of a Volvo I tackled a few years ago where the lighting was controlled by an electronic control unit buried behind the centre of the dash. The owner was unwilling to part with the hundreds of pounds a replacement would cost and planned to change the car instead.
I managed to rig a temporary switch that made the lights work, though can't remember quite how.

Modern cars using CAN-bus networks work in a similar way to that older Volvo where the various switches do not turn on lights, wiper, heater, etc. but tell a local ECU to send a signal out on the network instructing various other ECUs local to whatever needs to be activated to do the duty and switch on.
If this describes your car it will need investigating with dedicated diagnostic equipment before examining a wiring diagram.

If your car is of an older vintage it would be wise to begin with the wiring diagram.
Good luck!

Aug 08, 2015 | Cars & Trucks

4 Answers

I have a 2006 civic SI. DRL indicator is on, driver side low and high beam ok. Passenger side low beam ok but DRL and hi beam not working. Any help is appreciated.

When either the high or low beam light is out in either side, DRL (daytime running lights) indicator will come on. When one bulb goes out, that's a clue the opposite bulb will burn out soon, so its best to replace both bulbs. If it was a fuse issue, both left and right side would be out. If driver side is OK but passenger side is not, then its a bulb issue. A 2006 Honda civic takes 9006 (HB4) low beam bulbs and 9005 (HB3) high beam bulbs. Cheapest is online from Walmart site-2-store. After procuring, wear latex, vinyl, or ANY gloves to keep your (corrosive) oil skin from coming in contact with headlight glass bulbs. Your skin oil will chemically react and cause shorter life span on glass bulbs. Instruction don't tell you this, so you handle with your hands, then need to replace bulbs 3 years later instead of 5 years (or more) in the future. With gloves on, pop the hood and look behind each headlight. Turn counter clockwise to unlock headlight bulb holders. Its a quarter to half turn to unlock bulb holder lock. Replace one bulb at a time so you don't confuse high beam from low beam. The wire has a tab you need to lift to pull out & disconnect wire connector. You might need a slim narrow-**** (NOT phillips) screwdriver to lift the tab; or use your house key. Snap the wire connector to the new bulb, then twist into headlight housing to secure bulb holders, then move on to the next bulb to repeat the procedure. Pict below, 9005 high beam is on the left, 9006 low beam is on the right. Handle by grasping the plastic base, not the glass bulbs. The raised potrusion on the bottom center is where the tab locks onto wire connector. Replace all 4 bulbs now, but in the future, its likely the low beam will wear out before the high beam. In the future, replace only the pair, not all 4. The factory installs inferior bulbs that go out sooner, hoping you'll take to dealership and they ******** you with higher parts-n-labor fees. As opposed to Walmart online site-2-store, it would cost you AT LEAST triple in parts & labor from dealership to replace all 4 headlight bulbs :-(

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Could be a defective headlight relay, Located in the fuse block in engine compartment,

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I only have high beams no low beams.

I would start by checking the bulbs, if the bulb goes bad you can still have high beams, so start by checking the bulb and the fuses if they dont light up after replacing the bulbs , hope this is helpful,

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I believe that relay is up under the dash by the passenger's side (above where on eplaces their feet) Just a heads up though; if you're not getting fuel I'd check for injector pulse. Given the year of the truck there is a good chance the ECU has failed. Early 90"s Mitsubishi's had poor capacitors in the ECUs. Remove and open up the ECU look under the three (3) capacitors, if they'er leaking you'll see a light liquid on the circuit board under the caps, often with a green hew to it.

I hope this may have assited,

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The quckest way to fix this is to fit a relay to your high beam light circuit. This will feed power directly to your high beams and cut out the high resistance of switch and wiring.

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sounds like the problem is the dimmer switch, get a price on the dimmer switch. If you have to, get one at a junk yard . It's cheaper.

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Check for headlight relay and fuse. Some cars have separate circuits for head light flasher and normal high/low beam. From your description, I would suspect a bad connection to/from relay or relay itself.

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