shogun
10-28-2008, 09:55 PM
copied from Bimmerboard E32 forum:
Well, I've had to cover all the possible bases on this one -
1. Checked and cleaned all bulbs, replaced all with nickel plate bases
2. Replaced brake light switch under dash (based on NHTA report)
3. Re-soldered Mustard relay (later model with less circuitry inside)
4. Today, took apart the CCM module - newer model with 44/2001 date on the case - no visible problems with solder.
5. Today, took apart the LKM (mine has LKM US-L which apparently is a replacement for ECE-L which should have originally been on this National Germany version car. This newer US-L unit is a single circuit board type, that was apparently changed when the car was Federalized around 2002. It is now the three relay type. I re-soldered each relay connection EVEN THOUGH THERE WAS NO VISIBLE DEFECT IN THE SOLDER.
When I re-installed the LKM there was NO MORE 1-BRAKE LIGHT MESSAGE!!!
Mark
1991 750i DC05875 Mfg. 1/91, National German model for the Autobahn with 4 piston bridge calipers and 324x30MM front brake disks.
Well, I've had to cover all the possible bases on this one -
1. Checked and cleaned all bulbs, replaced all with nickel plate bases
2. Replaced brake light switch under dash (based on NHTA report)
3. Re-soldered Mustard relay (later model with less circuitry inside)
4. Today, took apart the CCM module - newer model with 44/2001 date on the case - no visible problems with solder.
5. Today, took apart the LKM (mine has LKM US-L which apparently is a replacement for ECE-L which should have originally been on this National Germany version car. This newer US-L unit is a single circuit board type, that was apparently changed when the car was Federalized around 2002. It is now the three relay type. I re-soldered each relay connection EVEN THOUGH THERE WAS NO VISIBLE DEFECT IN THE SOLDER.
When I re-installed the LKM there was NO MORE 1-BRAKE LIGHT MESSAGE!!!
Mark
1991 750i DC05875 Mfg. 1/91, National German model for the Autobahn with 4 piston bridge calipers and 324x30MM front brake disks.