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HOMESERVICE MANUALSBMW2001Z3 2D CONVERTIBLE, 3.0 3, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UPENGINE ELECTRICAL SYSTEM - REPAIR INSTRUCTIONSTROUBLESHOOTING12 00 ...WELDING WORK (OVERLOAD PROTECTION OF CONTROL UNITS)
2001 BMW Z3 2D Convertible, 3.0 3, Standard

12 00 ...Welding Work (Overload Protection Of Control Units)

2001 BMW Z3 2D Convertible, 3.0 3, StandardSECTION 12 00 ...Welding Work (Overload Protection Of Control Units)

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

  • Observe instructions for disconnecting and connecting battery. See 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY  .
  • Detach terminal of battery negative lead from car battery and second battery if fitted. Cover negative terminal posts.
  • 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. 1 mm).
  • Never connect return clamp to ground pin on body which has ground wires attached!

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.