Thread: Remote key not working

I can't answer your question, but if I was a betting man my money would be on the BCU before the ECU as it is the BCU that controls it.

OK so manual unlocking didnt work this time, the alarm went off again so I just manually locked the door again to hush it up. Now heres the strangest thing. I came back 1/2 hour later and when I got to within 10m of the disco my headlights turned on by themselves. I walked up an noone was inside it and it was locked. I manually unlocked and locked the door and the lights turned off as it locked.

Im clueless, did it pick up a RF signal when my fob was in range?

You need a nanocom and look at the bcu, even delete all the keys and start again. Theres a detect function use it for a key you know works with a new 2032 battery (2016 is too thin). Even if the bcu needs replacing you'll need a nanocom to set the bcu to the ecu (they're a paired thing. Wreckers will say you need to buy them as a set to rip more $$$). Saying that I've never had a bcu die yet where i couldn't get keys to work again by deletion and reloading.

The headlights will turn on if you press and hold the lock button, called a garage feature or something. Allows you to see your way to the front door at night. Can go.off in your pocket.

Originally Posted by Neavesie

OK so manual unlocking didnt work this time, the alarm went off again so I just manually locked the door again to hush it up. Now heres the strangest thing. I came back 1/2 hour later and when I got to within 10m of the disco my headlights turned on by themselves. I walked up an noone was inside it and it was locked. I manually unlocked and locked the door and the lights turned off as it locked.

Im clueless, did it pick up a RF signal when my fob was in range?

It seems that the first presumption that the fob has some intermittent internal short might be spot on though cos as said the receiver picked up a long lock signal from the fob and the BCU activated the courtesy headlight feature, so IMO for the BCU it was exactly like when you keep the lock button pushed longer, which means the receiver works well...that's why it drained the weaker batteries so fast and it might drain the good one faster too

don't you have the second fob to test it?

Only have 1 fob unfortunately.

I would try a new key fob first. If sierrafery's theory proved right it would be the cheapest option. If it turned out to be something else, you will have a spare for you finally get it sorted.

Yeah good point. Thanks.

Suggest you check the fob thoroughly. May have a faulty Micro Switch transmitting "Lock" function. Appears when you approached vehicle either the Lock micro switch was "On" or you had your finger on the lock button which turned the headlights on.
Check the Fob battery voltage at the contacts, not just the battery.
Regards
Harry