Evaluating Electronic Components After Repair And Painting Work And After Accidents - Ah54.00-P-1000-01A

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For paint drying in a drying oven
Electronic components such as, e.g. the switching unit for the ignition system, control unit for the electronic gasoline, diesel injection system, ABS system, airbag, emergency tensioning retractor etc., may only be heated up to a max. object temperature of 90 °C.

In cases of doubt, a series of tests is to be performed to check the temperature at these points (remove the electronic components beforehand) using a mercury maximum thermometer during the baking phase.

If the maximum permissible temperature is not exceeded, the electronic components need not be removed.

At an object temperature of up to a max. 60 °C (secondary air injection temperature max. 90 °C) no special safety precautions are required.
With welding work
Always detach the negative terminal of the battery and cover it up. Detach the test connector for the airbag connector, 10-pin (colored red) in the right footwell and after a waiting time of 2 s after disconnecting the battery, or as of 07/93, detach the coupling on the airbag control unit using the plug-in aid.
After accidents
Electronic control units only need to be changed after an accident when at least one of the following conditions has been fulfilled:
- The housing is recognizably deformed or damaged.
- The contact surface or mounting console is deformed; the device does not exhibit any signs of external damage.
- The connector is damaged or corroded through moisture.
- Device faults are determined by a function test or the self-diagnosis.
  If, when performing repair work, electronic components such as, e.g. the ABS control unit, had to be removed and then used again, then they are to be checked for function after being assembled again.
  
  Read out and erase fault memory.