BMW 318/325/M3/525/535/M5 1989-1993 Repair Information



The following cautions should be observed to protect the DME system and components:

Always disconnect the battery, the DME control unit and the ignition coils when using an electric welder on the vehicle or when charging the battery or when the vehicle is placed in a paint drying oven.
Relieve the fuel system pressure before disconnecting any component of the fuel injection system that contains fuel.
Remove the main DME relay to disable both the fuel and ignition systems when checking the compression. Never crank the engine after removing the distributor cap or disconnecting the high tension wire on the ignition coil.
Never disconnect the battery or wires on the alternator, starter or spark plugs when the engine is running.
Never connect a test lamp on terminal 1 of the ignition coil.
Never connect terminal 1 of the ignition coil with ground or B+. This means if installing a burglar alarm, terminal 1 should not be used for starter interlocking.
Whenever performing work on the EML throttle by wire system, a check of the external safety path must be made. This is to check the proper operation of the EML safeguards.
When working with the EML throttle by wire systems do not place hands or fingers in or near the throttle plates. The throttle motors can close the throttle plates with considerable force.