LKM headache... Help?
I was having problems, my 97 540i was intermittantly displaying "check front foglamps", while the lights worked. Then the right fog light started to delay lighting light up for about 5 sec. when switched on. My friend (an independent BMW shop owner) decided that the light control module (LKM) was bad so he ordered a new one. After installing the new one, a few wierd things happened:
When I first turned the lights on, the same foglight didn't light. After cursing for a few minutes, I turned the lights off then back on, and it light. The light has worked correctly since, and no check warning since.
However, I then got a check brake lights warning, even though all lights were working. Additionally, a small red dot next to the odometer was lit (this indicates that the cluster was changed/tampered with) Additionally, when the parking lights were switched on, everything worked. Angel eyes lit up, fogs came on, and cluster lit. But when I switch on the headlights, the angel eyes and the cluster lights went off. Headlights and fogs worked, but the AE's (which get power from the signel running light power) and the cluster are dark!
My friend sad that I had to bring the car to a dealer to have the LKM coded to the car. Ok, so I go to the dealer who fixes the brake check (by replacing all the bulbs) but told me that there was no coding to be done to the LKM, and the tamper light came on because the cluster memory is backed up by the lkm and the light can't be reset?
So why the heck am I getting the strange behavior of the cluster and running lights? If I put back the old LKM, everything works as before, (Including the check foglamps warning) And why does the EPC say that the LKM needs to be coded, yet dealer says no?
I know it's an impossible question, I'm just frustrated and I'm just hoping that maybe someone had a similar experience...
Last edited by mchad; 03-29-2005 at 05:34 PM.