Glow Plug Relay: Service and Repair

12 21 500 - Removing and installing/replacing relay for glow elements (M57TU, M57T2)





Necessary preliminary tasks:
- Read out fault memory of DDE control unit; if necessary, work through test schedules
- Switch off ignition
- Disconnect battery negative lead





Release plug connector (1) and pull off.
Unlock and detach plug connection (3).
Unscrew nuts (2).
Remove preheating relay (4).

Note:
For purposes of clarity, illustration shows coolant hoses removed.





Check function of DDE.