Programming Failure Work Around

Michael Technical Support Specialist New York Posted   Latest   Edited  
Tech Tip
2002 BMW 325i 2.5L (M54) 5-spd (5HP-19)
Dme Fails To Update

So you’ve attempted a programming on an MS42 or MS43 DME and it failed. Now you have no communication to the DME. Are you boned???

Maybe not!!!

Give this procedure a shot...

Access the DME relay and verify the loss of ground

Apply a good ground to pin 4 of relay and verify B+ out of pin 2 at relay.

Attach battery charger, and with a volt meter, maintain approximately 13.5v. Lower than 13 or higher than 14 will cause the programming to abort.

It may take over 1 hour to fully complete the programming. If fails again, perform a battery disconnect overnight and try again. If it fails again, you can attempt to bench program the DME.

Hook up the DME as shown.

Angel Technician

Great information thanks for sharing. I’m sure it will save someone from having a bad day.

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