Removing
1. Disconnect the negative cable from the battery.
2. Remove the side trim panel in the driver's footwell (Section 11).
3. Release the block from the fasteners, remove it, disconnect the electrical wiring (see illustration).
4. Please note that the unit consists of two parts: the main control unit and the read-only Programmable Memory Unit (PROM). While blocks can be replaced independently, don't try to separate them. Damage can only be diagnosed by an experienced mechanic using special Opel equipment. If the ECU makes any sound, it may be severely damaged due to poor connection between the two sub-units.
Installation
5. Installation is carried out in the reverse order. Make sure the electrical wiring is connected correctly.
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