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Home >> BMW >> 1997 >> 528i (E39) L6-2793cc 2.8L DOHC (M52) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Service Precautions >> Instructions For Welding Work
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Instructions For Welding Work

When performing welding work on installed control units, to avoid any defects in the electronic control units, observe the following steps:

- Comply with instructions on connecting and disconnecting battery.

- Disconnect negative terminal on battery and also disconnect the second battery, if fitted. Cover up negative terminal(s).

- If welding is to be performed near the battery/batteries, first remove battery/batteries from vehicle (flying sparks - combustion of explosive gas).

- Fit return clamp on welding unit as close as possible to welding point (maximum distance approx. 1m).

- Never connect return clamp to ground pin on body which has ground wires attached!