Engine Control Module EPROM Replacement

Preparatory Instructions:
The installation of the updated EPROM into the engine control module is a simple procedure.

However, before beginning the EPROM exchange, the following conditions must be provided and the designated tools must be used.

ENVIRONMENT

The work area where the EPROM is exchanged must be free of excessive dust and aggressive chemicals or vapors. A small uncarpeted office within the dealership is recommended. Since low atmospheric humidity promotes static electricity, an evaporating bowl of water can be used to raise the humidity level of the work area.

EQUIPMENT

Screwdrivers (blade type) are only used to open and close the engine control module. The EPROM is exchanged using an IC extractor/inserter set. Tool sets can be obtained locally (Radio Shack, Archer # 276-1581).

STATIC ELECTRICITY

The engine control module can be damaged and rendered unusable by static electrical discharge. For this reason the 3M static protection kit (or equivalent) must be used during the entire EPROM exchange procedure. See S.I. 04 30 87 (1546) for complete details.

EPROM STORAGE

Replacement EPROMs must be stored in the original shipment containers. The label in the center of the EPROM must never be removed.

Procedure:

CAUTION:
Whenever connecting or disconnecting any control module the IGNITION MUST BE SWITCHED OFF.





- Remove the 4 screws (Torx T20) from the top side of the control module.





- Lay the control module face down on the static mat and carefully bend up the 6 tabs only as far as necessary to remove the cover. On control modules with an upper circuit board, remove the retaining pin from the plastic rivet using needle nose pliers.

- Remove the cover from the control module.

- On control modules with an upper circuit board, remove the white plastic cover from the top side of the control module.





- Remove the ground point screw (Torx T20) from the upper circuit board.





- On control modules with an upper circuit board, carefully separate the two circuit board support towers. Gently raise the rear of the upper circuit board and fold the connecting ribbon out between the two circuit boards.





- On control modules with an upper circuit board, while gently raising the back of the upper circuit board, release the two front retaining clips in the connector plug.





- On control modules with an upper circuit board, slide the circuit board backwards out of the connector and rotate upwards. Lay the open control module out on the static mat.

This procedure is easiest to perform if the back of the circuit board is raised and a slight downward pressure is exerted on the connector pins of the upper circuit board.





- Remove the EPROM security cap (1) by inserting a small straight blade screwdriver into the slot of each long side and releasing the catch by gently prying outward against the side.





- Remove the EPROM from the circuit board using the IC extractor tool.





Caution:
Do not touch the contact pins of the EPROM.





- Install the new updated EPROM using the IC inserter tool (1).

The EPROM is correctly installed when the notch in the EPROM aligns with the notch in the IC socket (2).

Assure that all the EPROM contact pins are fully inserted by pushing down on the EPROM until the stop is felt.

- Reinstall EPROM security cap.

- On control modules with an upper circuit board, reinstall upper circuit board and ground point Torx screw. Place white plastic cover on top.

- Reinstall cover with 4 Torx screws and bend tabs down.

- Affix "BMW NA Quality Control" label (P/N 01 00 1 467 895) on to the front of control module for future identification of modification to control module. One label will be included with each EPROM ordered.