Fog lights are staying on with vehicle shut off.
Gabe Lamarre To expand on the problem. They came on overnight while the vehicle was parked. They do not respond to the swich. They turn off when the vehicle is running and the headlights are on and will not turn on with the switch as long as the headlights are on. With the vehicle running and the headlights off they are on and remain on regardless of position on the foglamp switch and remain on when the vehicle is shut off. To keep my battery from being drained I unplugged the fog light bulbs and have been using the vehicle in this manner. Any help in a solution to this problem would be greatly appreciated.
Sep 25, 2013
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Re: 2005 avalanche Fog lights are staying on with
The fog lamps are computer controlled .the body control module (BCM) will energize the fog lamp relay control circuit. The BCM receives the park lamp ON signal from the interior park lamps supply voltage signal circuit.
DTC B2527 Front Fog Lamps Circuit Low
The body control module (BCM) monitors the front fog lamp switch signal circuit in order to determine when the fog lamp relay is to be energized. When the BCM senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch, the BCM energizes the fog lamp relay by grounding the fog lamp relay control circuit.
Your best bet , take it to the dealer . Could need BCM replaced , would need to do testing using the Tech 2 scan tool . A new BCM has to be programmed .
Body Control Module (BCM) Replacement
If the body control module (BCM) is replaced, the following procedures must be performed in the following order:
BCM Reprogramming--Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
Important: This procedure has to be performed only for vehicles equipped with the Passlock™ System.
Theft Learn--Refer to Programming Theft Deterrent System Components in Theft Deterrent. A new BCM will learn the Passlock™ information automatically, but the powertrain control module (PCM) must still learn the theft information from the BCM.
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Sounds as if there is a parasitic draw on the battery. You need to perform a draw test to see what amperage is being drawn from the battery while the vehicle sits. Anything more than !/4 amp will kill the battery overnight. Check for any lights that may be staying on inside the vehicle as well as outside the vehicle while it is shut off before getting involved in a draw test
Remove a battery terminal, Connect an Amp meter in series, should get a reading of about 0.3 of an amp, that will be the clock, for it to kill a battery overnight I would expect a reading of about 3 amps, something is staying on? Trunk light is a favourite, you can't see it with the trunk shut, remove the fuses one at a time and watch the meter, when the drain drops off, you have found the cicuit
Many of the newer vehicles have bulbs that are removed internally, meaning with the hood up. You cannot touch the replacement bulbs with you fingers as the oils from you fingers will shorten its life. Wear gloves or use tissue. The low beam went because they were hot when you struck the other vehicle, when hot they become more delicate.
There should be a brake light switch under the drivers side mounted on the brake pedal it may have broke or come out of adjustment in any case you could push the switch in by hand and tape it as to not drain your battery until you can get a replacement part for it if indeed it needs to be replaced otherwise it may just need to be adjusted.
the hood and reach down into the engine bay for the fog light assembly.
If you cannot reach the fog light assembly from the top you may need to
get underneath the truck to reach it. Remove the electrical plug
running to the fog light ballast.
Remove the bulb. Unlock the fog light bulb by turning it counterclockwise and pulling it straight out of the assembly.
a new bulb into the fog light assembly. The part number you will need
for the new bulb will be located on the ballast or base of the old bulb.
Turn the bulb clockwise to lock it into the fog light housing.
Reconnect the electrical connector to the bulb ballast.
2005 Forester - It is easiest to remove the fog assembly.
1. From underneath the vehicle pry out one plastic fastener to be able to bend the light weight plastic mud protector downward. You will see the underside of the fog light assembly with one 10mm bolt directly above you. Remove this bolt. 2. From the front of the vehicle unscrew one 10mm bolt at top of fog light (this is the shorter of the 2 by the way) and pry out one plastic rivet adjacent to it. 3. Carefully remove the fog assembly and disconnect 2-pin power connector by pulling up on the release. Carefully wiggle the housing out (no force req'd). 4. Unscrew the back from the housing and replace H3 bulbs. Take care not to touch the bulb while replacing. 5. Reverse to install. Should take an hour at most.
First check to make sure all the harness plugs on the PCM are pushed in and tight. It happened to me.
Then check your grounds.
And you need to get that multi switch replaced to fix that fog light problem. Just remember to take the relay off of the old one and replace it on the new one.