Markph123 Posted June 25, 2019 Share Posted June 25, 2019 Hi. Me and my wife have a 14 plate ford focus ecoboost. It has developed a fault where the front left fog light is continually on, even with the ignition off. The only way I've managed to stop it draining the battery is to remove the fuse. When the car is on the fog light indicator is off on the dash and pressing the fog light button seems to do nothing on the switch. We have booked in with ford but they say it'll be a £57 diagnostic test but I'd rather see if it can be fixed prior to it going in, even for a fraction of the price if not free! Any help is appreciated! Quote Link to comment Share on other sites More sharing options...
iantt Posted June 25, 2019 Share Posted June 25, 2019 Do both fog lights work if you switch them on normally with the fog lamp indicator too? Quote Link to comment Share on other sites More sharing options...
Markph123 Posted June 25, 2019 Author Share Posted June 25, 2019 7 hours ago, iantt said: Do both fog lights work if you switch them on normally with the fog lamp indicator too? When turning them on it illuminates on the dash but the left one stays on and the right one doesn't come on at all. Only way to actually turn it off right now is by taking the fuse out for the front fogs. I have noticed upon putting the fuse back in that the fog that stays on flickers from time to time so makes me think there may be water getting in somewhere! Quote Link to comment Share on other sites More sharing options...
iantt Posted June 25, 2019 Share Posted June 25, 2019 Power to both foglights is from same fuse, same relay so both should be stuck on or both not work. That doesn't make much sense. Have you checked the bulb that doesn't work? The earth path is via the headlights, so check the connectors at the headlights for corrosion . If you can get the fog to stay on permanently, try unplugging the same side headlight connector and see what happens Quote Link to comment Share on other sites More sharing options...
Markph123 Posted June 25, 2019 Author Share Posted June 25, 2019 1 hour ago, iantt said: Power to both foglights is from same fuse, same relay so both should be stuck on or both not work. That doesn't make much sense. Have you checked the bulb that doesn't work? The earth path is via the headlights, so check the connectors at the headlights for corrosion . If you can get the fog to stay on permanently, try unplugging the same side headlight connector and see what happens Initially both fog lights were on but now it's just the front left that stays on, may be a coincidence that the right bulb may have gone but won't find out until tomorrow. I'll have a look tomorrow when there's better weather to do so and see what I can find out when disconnecting headlights etc. I'll update you on this tomorrow evening! Quote Link to comment Share on other sites More sharing options...
iantt Posted June 25, 2019 Share Posted June 25, 2019 Now you've said both were staying on initially. I'm now guessing the fog lamp relay is stuck on. Sounds a bit brutal but give the bcm a bit of a thump. Quote Link to comment Share on other sites More sharing options...
Markph123 Posted June 26, 2019 Author Share Posted June 26, 2019 7 hours ago, iantt said: Now you've said both were staying on initially. I'm now guessing the fog lamp relay is stuck on. Sounds a bit brutal but give the bcm a bit of a thump. When you're referring to the BCM, what is that and where can I find it? Quote Link to comment Share on other sites More sharing options...
iantt Posted June 26, 2019 Share Posted June 26, 2019 Yeah, but I think the relay could be intergrated into the bcm . The bcm is the fusebox in the passengers footwell Quote Link to comment Share on other sites More sharing options...
Markph123 Posted June 26, 2019 Author Share Posted June 26, 2019 2 hours ago, iantt said: Yeah, but I think the relay could be intergrated into the bcm . The bcm is the fusebox in the passengers footwell Okay. I'll give it a thump once I'm finished work. Is it a common fault for the fog relay to stay on? Quote Link to comment Share on other sites More sharing options...
iantt Posted June 26, 2019 Share Posted June 26, 2019 1 hour ago, Markph123 said: Okay. I'll give it a thump once I'm finished work. Is it a common fault for the fog relay to stay on? Not that I'm aware of. Quote Link to comment Share on other sites More sharing options...
Markph123 Posted June 27, 2019 Author Share Posted June 27, 2019 23 hours ago, iantt said: Not that I'm aware of. I've had a thump at it and it seems to not do anything. I'm going to try disconnecting the battery tonight and leaving it off for 30 minutes to try resetting the relays. Seems a shame the relay is actually integrated into the BCM. Quote Link to comment Share on other sites More sharing options...
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