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Home >> BMW >> 2005 >> 325Ci Convertible (E46) L6-2.5L (M54) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Main Relay (Computer/Fuel System) >> Service and Repair
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Main Relay (Computer/Fuel System): Service and Repair




Replacing Main Relay

Switch off ignition.
Connect DIS Tester.







Release screws (1).
Remove electronics box cover.







Installation:
Correctly install wiring harness with grommet in electronics box cover (water tightness).

Hook cover (3) into hinges of underside of electronics box (1).
Then correctly install upper stop (2) above hinges on underside of electronics box.







Arrangement:
1. Main relay of Digital Motor Electronics
2. Engine fuses of Digital Motor Electronics

Notes on troubleshooting:
If the starter motor cranks the engine during the starting sequence but the engine fails to fire, then:
1. Check engine fuses
2. If fuses are blown, replace them completely with fuse holder
3. Find out why fuses have blown
Continue troubleshooting as per DIS instructions.
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