Engine Electrical System - Repair - e92/93 BMW M3 E90

12 00 ... Instructions for disconnecting and connecting battery

Observe safety instructions for handling vehicle battery. See 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

Before disconnecting battery

Turn off the ignition and other electrical loads/consumers to prevent sparking when reconnecting.

Note. If the ignition is not turned off when the battery is disconnected, fault memories may be set in some control units.

General notes on disconnecting battery

1. Do not disconnect battery leads and leads from alternator and starter motor while engine is running.
2. Cars with IBS on battery negative terminal: Do not under any circumstances pull/lever off pole shoes by force. Do not under any circumstances release socket-head cap screw of IBS.
3. Detach terminal of battery negative lead from car battery and second battery if fitted. Cover battery negative terminal(s) and secure.
4. When work is carried out on the electrical system, faults may be caused in the fault memories of some control units when the battery is connected.
5. When installing battery terminal: Tightening torque 61 21 1AZ , see «61 21 BATTERY WITH TERMINAL»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-tightening-torques-e9293__61-21-battery-with-terminal) .

After connecting battery

Likewise, individual settings may be lost.

Settings or activations must be carried out, depending on the equipment specification.

Example

1. Vehicles with automatic engine start-stop system (MSA): MSA function is active only after learning period (vehicle must not be woken for a period of approx. 6 hours) > if necessary, notify customer of the situation
2. E46 (AWD)/ E53/ E83: Carry out steering angle sensor adjustment
3. If necessary, carry out adjustment of active front steering
4. If necessary, activate sliding sunroof
5. If necessary, activate power windows
6. If necessary, activate mirror with compass

Vehicles with a two-battery system

Starter and equipment batteries

A two-battery system has a starter battery circuit and an equipment battery circuit. A supplementary control unit monitors both battery circuits. Depending on the situation, the battery circuits are connected to or isolated from the supplementary control unit via an isolating relay.

Two AGM batteries, whose design and properties are described in AGM batteries , are used as a storage battery.

Receiving/giving starting assistance via jump start terminal

The engine can be jump-started with an external voltage supply via the jump start terminal on the right side of the engine compartment.

Note. The starter battery is isolated from the alternators when the engine hood/bonnet is open.

Giving starting assistance via the jump start terminal is thus limited by the capacity of the starter battery when the engine hood/bonnet is open.

Charging starter and equipment batteries via jump start terminal

The starter battery is charged as a matter of priority with a charger connected to the jump start terminal. The voltage at the starter battery is the decisive factor in determining whether the equipment battery is also included in the charging operation. The supplementary control unit automatically detects a charging operation at a charging voltage at the starter battery of > or = 13.5 V. The isolating relay is closed and thus the equipment battery is connected in parallel. Both batteries are now charged.

Prerequisite

1. Terminal 61 inactive
2. Terminal 15 inactive

If terminal 15 becomes "active" during the charging operation, the isolating relay is opened immediately and again only the starter battery is charged.

Note. When the engine hood is open, the isolating relay is also opened in normal operation when the engine is running. A special mode can be set by means of diagnosis for workshop/garage operation. The isolating relay is closed from terminal R in this operating mode. This mode is automatically reset once a distance of 5 km has been driven.

Trickle charging

The increased closed-circuit current consumption can be compensated for via the jump-start connection point with the aid of the "Acctiva easy" battery trickle charger.

12 00 ... Instructions for working on the ignition system

High tension! - High tension!

1. Ignition lead
2. spark-plug connectors
3. spark plugs
4. Ignition coil (high voltage at terminal 4 is approx. 40 kV)
5. Lead of terminal 1 from ignition coil to DME control unit (high voltage approx. 350 V)

12 00 ... Notes/information on removing and installing control units

When replacing the DME/DDE control unit, observe the following

1. In each case read out the hardware/software status of the relevant control unit using the BMW diagnosis system. Comply with the instructions of the DIS diagnosis system on the steps pertaining to coding and programming. On vehicles with electronic vehicle immobilization, comply with the instructions of the BMW diagnosis system.
2. Each control unit is programmed with certain basic values, which serve as mean values. The control unit receives different input values, depending on engine condition, which are compared with the stored values. The adaptive system compares the input values with the stored map values. The control commands are routed to the relevant actuators.
3. If the DME control unit is without current for a long time (more than one hour), its adaptive system loses the stored values. When a cleared control unit is restarted or a new control unit is installed, the adaptive system must read in and store the input values of the associated engine as new basic values itself.
4. This procedure could lead to erratic idling and disturbed overrunning of the engine after starting. Depending on the engine it could require some time before all values are adapted to the engine condition.
5. Therefore observe the following procedure before replacing or reinstalling a DME/DDE control unit: If possible before exchanging control unit, run engine up to operating temperature. Exchange control units and run the vehicle at alternating engine speeds.

12 00 ... Notes/information on start assistance (jump starting)

Do not start the engine with help of starting sprays.

Preparation

Conform with the following when starting the engine with a jump starting cable.

1. Ensure that the jump starting cable wires are of appropriate cross-section size.
2. Only use fuse-protected jump starting cables.
3. Check whether the current-supplying battery has 12 V voltage.
4. If the engine is started from the battery of another vehicle, ensure that there is no contact between the bodies of both vehicles.

If the battery in the vehicle supplying power is weak, start the engine of this vehicle and let it run at idling speed.

Operation

It is essential to conform to the procedures so as to avoid injury to persons or damage to parts.

1. Automatic transmission: select drive position "P", apply parking brake.
2. Manual transmission: move gear lever to neutral position, apply parking brake.
3. Ensure that the jump leads cannot get caught in rotating parts, e.g. fan.
4. First connect both positive poles of the batteries with one jump starting cable (red).
5. Use the battery positive terminal in the engine compartment for vehicles with the battery in the luggage compartment.
6. Then use the second jump starting cable (black) to connect the negative post of the current-supplying battery with the earth/ground point (not the negative pole or the body) of the vehicle to be started.

Risk of explosion!

After the engine of the vehicle to be started has fired, first disconnect the jump starting cable between the negative pole and the earth/ground point. Then remove the starting cable from the positive poles.

12 12 011 Replacing all spark plugs (S65)

Special tools required

1. 12 1 171
2. 12 1 172

See ENGINE ELECTRICAL SYSTEM - SPECIAL TOOLS .

Necessary preliminary tasks

1. Switch off ignition.
2. Remove all «ignition coils»(/bmw/m3/e90-2007-2013/remont/gauges-instrument-panels/#engine-electrical-system-repair-e9293__12-13-512-removing-and-installingreplacing) .

Clean spark plug slot with compressed air.

Unscrew spark plugs with special tool 12 1 171 .

Installation

Tighten down spark plugs with special tool 12 1 171 and special tool 12 1 172 (torque limiter).

Without special tool 12 1 172 , observe tightening torque.

Tightening torque 12 12 1AZ , see IGNITION WIRES, SPARKPLUGS .

Scheme 1

12 13 512 Removing and installing/replacing all ignition coils (S65)

Special tools required

1. 11 9 980

See ENGINE - SPECIAL TOOLS .

Necessary preliminary tasks

1. Read out fault memory of DME control unit
2. Switch off ignition
3. Remove air filter housing . See «13 71 000 REMOVING AND INSTALLING/REPLACING INTAKE FILTER HOUSING (S65)»(/bmw/m3/e90-2007-2013/remont/fuel-system/#fuel-system-repair-e9293__13-71-000-removing-and-installingreplacing) .
4. Release and raise coolant expansion tank, do not kink hoses
5. Remove ignition coil cover on left and right

Pull off plug (1).

Pull out ignition coil (2) in upward direction with aid of 11 9 980 .

This tool is essential to ensure damage-free removal of the ignition coils.

This procedure is applicable to all ignition coils.

Installation

Insert rubber seal on ignition coils between guides in cylinder head cover.

Scheme 2

Note. Assemble engine. Check stored fault messages. Now clear the fault memory.

12 14 550 Replacing control unit (DME) (S65)

Necessary preliminary tasks

1. Switch off ignition.
2. Disconnect battery . See «61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-repair-e9293__61-20-900-disconnecting-and-connecting) .
3. Remove lower section of microfilter housing on right. See «64 31 063 REMOVING AND INSTALLING/REPLACING RIGHT LOWER MICROFILTER HOUSING SECTION»(/bmw/m3/e90-2007-2013/remont/automatic-hvac-system/#heating-and-air-conditioning-repair-e9293__64-31-063-removing-and-installingreplacing) .

Replacement

1. Carry out programming/coding

Switch off ignition.

Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Scheme 3

Unlock plug (1) and remove.

Release grommet (2) from electronics box.

Installation

Make sure grommet (2) is correctly seated in housing (watertightness).

Unlock control unit (3) and raise slightly.

Scheme 4

Unlock plugs (1) using slide in direction of arrow and remove.

Remove control unit (2).

Installation

Replacement

Note device identification number and coding.

Scheme 5

Note. Check stored fault message. Now clear the fault memory.

12 14 700 Coding control module (DME / DDE)

Switch off ignition.

Connect MoDiC or DIS/GT1 Tester.

Switch on ignition.

Select "Coding" program.

For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.

Carry out adjustment of following control units

1. EWS (electronic immobilizer)
2. DME (Digital Motor Electronics) or
3. DDE (Digital Diesel Electronics)

12 14 705 Programming control unit (DME / DDE)

Switch off ignition.

Connect MoDiC or DIS/GT1 Tester.

Switch on ignition.

Select "Programming".

For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.

Carry out adjustment of following control units

1. EWS (electronic immobilizer)
2. DME (Digital Motor Electronics) or
3. DDE (Digital Diesel Electronics)

13 62 029 Replacing suction pressure sensor on air intake manifold (S65)

See Replacing Suction Pressure Sensor On Air Intake Manifold (S65) in FUEL SYSTEM - REPAIR article.

13 62 601 Replacing pulse generator on left inlet camshaft (S65)

See Replacing Pulse Generator On Left Inlet Camshaft (S65) in FUEL SYSTEM - REPAIR article.

13 62 602 Replacing pulse generator on right inlet camshaft (S65)

See Replacing Pulse Generator On Right Inlet Camshaft (S65) in FUEL SYSTEM - REPAIR article.

13 62 604 Replacing pulse generator on left exhaust camshaft (S65)

See Replacing Pulse Generator On Left Exhaust Camshaft (S65) in FUEL SYSTEM - REPAIR article.

13 62 605 Replacing pulse generator on right exhaust camshaft (S65)

See Replacing Pulse Generator On Right Exhaust Camshaft (S65) in FUEL SYSTEM - REPAIR article.

13 62 607 Replacing pulse generator on transmission (S65)

See Replacing Pulse Generator On Transmission (S65) in FUEL SYSTEM - REPAIR article.

13 62 610 Replacing pulse generator on crankshaft/transmission (S65)

See Replacing Pulse Generator On Crankshaft/Transmission (S65) in FUEL SYSTEM - REPAIR article.

12 31 ... Replacing alternator belt pulley

Special tools required

1. 12 7 110

See ENGINE ELECTRICAL SYSTEM - SPECIAL TOOLS .

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with

1. hexagon socket
2. multi-tooth socket or
3. Torx socket wrench

Release nut with special tool 12 7 110 .

Installation

Tightening torque, 12 31 2AZ / 12 31 3AZ , see 12 31 ALTERNATOR .

Scheme 6

12 31 ... Replacing alternator belt pulley (with overrunning clutch)

Special tools required

1. 12 7 120

See ENGINE ELECTRICAL SYSTEM - SPECIAL TOOLS .

Remove and install alternator drive belt.

Grip alternator shaft with

1. internal serration

Release nut with special tools 12 7 120 .

Installation

Tightening torque 12 31 3AZ , see 12 31 ALTERNATOR .

Scheme 7

12 31 009 Checking alternator (BSD)

Necessary preliminary tasks

1. Correct connections on charged battery
2. Correct connections on alternator and starter motor
3. Good ground connection between engine and body
4. Tensioned ribbed V-belt
5. Read out DME/DDE fault memory.

Note. The alternator with BSD interface can communicate with the engine control unit (DME/DDE). The alternator is not connected to the charge telltale light. The alternator can identify various faults.

BSD alternator can be recognized by the plug connection on the alternator.

Connect diagnosis tester.

1. Function selection
2. Complete vehicle
3. Drive
4. Voltage and current regulation
5. Voltage and current generation
6. Alternator
7. Follow instruction in diagnostic program

Oscillogram for a fault-free alternator

Scheme 8

Oscillogram for a faulty alternator

One phase interrupted.

Repair/exchange alternator.

Scheme 9

Interturn fault.

Repair/exchange alternator.

Scheme 10

Open circuit in negative diode.

Repair/exchange alternator.

Scheme 11

Short circuit in positive diode.

Repair/exchange alternator.

Scheme 12

Open circuit in positive diode.

Repair/exchange alternator.

Scheme 13

Open circuit in exciter diode.

Repair/exchange alternator.

Scheme 14

Assemble engine.

Check function of DME/DDE.

12 31 020 Removing and installing or replacing alternator (S65)

Necessary preliminary tasks

1. Switch off ignition
2. Follow «instructions for disconnecting and connecting battery»(/bmw/m3/e90-2007-2013/remont/gauges-instrument-panels/#engine-electrical-system-repair-e9293__12-00-instructions-for-disconnecting)
3. Disconnect battery negative lead and cover. See «61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-repair-e9293__61-20-900-disconnecting-and-connecting) .
4. Remove air filter housing . See «13 71 000 REMOVING AND INSTALLING/REPLACING INTAKE FILTER HOUSING (S65)»(/bmw/m3/e90-2007-2013/remont/fuel-system/#fuel-system-repair-e9293__13-71-000-removing-and-installingreplacing) .
5. Remove underbody protection . See «51 47 490 REMOVING AND INSTALLING / REPLACING FRONT UNDERBODY PROTECTION»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#body-equipment-repair-e9293-m3__51-47-490-removing-and-installing) .
6. Remove alternator drive belt . See «11 28 010 REPLACING ALTERNATOR DRIVE BELT (S65)»(/bmw/m3/e90-2007-2013/remont/mechanical/#engine-repair-e9293__11-28-010-replacing-alternator-drive) .

Release screws.

Unclip hoses from hose holders on radiator.

Carefully press leads (1) to one side.

Scheme 15

Release screws.

Pull alternator (1) forwards until connections are accessible.

Scheme 16

Unlock plug (1) and remove.

Release nut (2), remove battery positive lead from alternator.

Tightening torque 12 31 1AZ , see 12 31 ALTERNATOR .

Pull alternator (3) upwards to remove.

Add final details to vehicle.

Read fault memory.

Scheme 17

12 32 501 Replacing voltage regulator

Necessary preliminary tasks

1. Switch off ignition
2. Disconnect battery negative lead . See «61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-repair-e9293__61-20-900-disconnecting-and-connecting) .
3. Notes on removing and installing electronic control units
4. Remove alternator

Bosch

Release protective caps (1).

Scheme 18

Bosch

Release screw (1) and nuts (2), remove cover.

Scheme 19

Bosch

Release screws and remove regulator switch (1) in direction of arrow.

Scheme 20

Bosch

Installation

Clean contact surfaces and check pretension of contact spring, replace regulator switch if necessary.

Measurement A = min. 5 mm.

Check collector ring for wear and recondition if necessary.

Scheme 21

Valeo

Slacken nut (1).

Slacken nut (2).

Release screws (3).

Release cover (4).

Scheme 22

Valeo

Release screws.

Remove regulator switch (1) towards top.

Scheme 23

Valeo

Installation

Clean contact surfaces and check pretension of contact spring, replace regulator switch if necessary.

Measurement A = min. 5 mm.

Check collector ring for wear and recondition if necessary.

Scheme 24

Installation

Fit new regulator (1) with attached mounting sleeve (2) or locked carbon brush.

Pull off mounting sleeve (2) and replace with cover (3).

Scheme 25

12 41 020 Removing and installing/replacing starter (S65)

Necessary preliminary tasks

1. Switch off ignition
2. Disconnect battery negative lead and cover. See «61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-repair-e9293__61-20-900-disconnecting-and-connecting) .
3. Remove intake air manifold . See «11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S65)»(/bmw/m3/e90-2007-2013/remont/mechanical/#engine-repair-e9293__11-61-050-removing-and-installing) .
4. Remove idle actuator . See «13 41 550 REPLACING IDLE ACTUATOR (S65)»(/bmw/m3/e90-2007-2013/remont/fuel-system/#fuel-system-repair-e9293__13-41-550-replacing-idle-actuator) .
5. Remove throttle valve actuating motor on left. See «13 62 540 REMOVING AND INSTALLING/REPLACING THROTTLE VALVE ACTUATING MOTOR (S65)»(/bmw/m3/e90-2007-2013/remont/fuel-system/#fuel-system-repair-e9293__13-62-540-removing-and-installingreplacing) .

Remove idle actuator mounting.

Scheme 26

Unlock plug (1) and remove.

Unfasten nut.

Tightening torque 12 41 1AZ , see STARTER WITH MOUNTING .

Remove battery positive lead (2).

Scheme 27

Release screw (1).

Release screws (2).

Tightening torque 12 41 2AZ , see STARTER WITH MOUNTING .

Pull starter motor out of transmission mount and remove.

Scheme 28

Installation

Check starter pinion and ring gear for damage, replace damaged parts if necessary.

Add final details to vehicle.

12 41 041 Replacing solenoid switch

Turn off ignition.

Remove starter motor.

Release nut (1).

Remove cable lug (2).

Scheme 29

Tightening torque, 12 41 4AZ , see STARTER WITH MOUNTING .

Release screws (1).

Scheme 30

Remove solenoid switch (1) and spring (2).

Unhook pin (3).

Installation

Check pin (3) for wear and apply grease.

Scheme 31

12 42 510 Replacing battery positive lead (between starter and B+ terminal) (S65)

Read fault memory. Switch off ignition.

Observe safety instructions for handling vehicle battery . See 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

Observe instructions for disconnecting and connecting battery .

Disconnect battery negative lead from battery and lay to one side.. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .

Necessary preliminary tasks

Remove intake air manifold . See 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S65) .

Release and raise cable duct for engine wiring harness.

Release nut (2) on B+ lead.

Remove B+ leads.

Installation

Tightening torque, 12 41 1AZ , see STARTER WITH MOUNTING .

Release clamp for B+ lead on cylinder no. 4.

Unclip lead from cable holders.

Scheme 32

Remove cover from B+ terminal. Unfasten nut. Remove B+ lead.

Installation

Tightening torque, 12 42 1AZ , see STARTER LEAD .

Scheme 33

Note. Assemble engine.

Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults and clear fault memory.

Read fault memory. Switch off ignition.

Observe safety instructions for handling vehicle battery . See 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

Observe instructions for disconnecting and connecting battery .

Disconnect battery negative lead from battery and lay to one side.. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .

Necessary preliminary tasks

Remove intake air manifold . See 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S65) .

Release and raise cable duct for engine wiring harness.

Release nut (2) on B+ lead.

Remove B+ leads.

Installation

Tightening torque, 12 41 1AZ , see STARTER WITH MOUNTING .

Release clamp for B+ lead on cylinder no. 4.

Unclip lead from cable holders.

Remove cover from B+ terminal. Unfasten nut. Remove B+ lead.

Installation

Tightening torque, 12 42 1AZ , see STARTER LEAD .

Note. Assemble engine.

Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults and clear fault memory.

12 51 001 Replacing wiring harness section for engine (S65)

Necessary preliminary tasks

1. Read out fault memory of control unit of Digital Engine Electronics (DME)
2. Check stored fault messages.
3. Switch off ignition
4. Disconnect «battery»(/bmw/m3/e90-2007-2013/remont/gauges-instrument-panels/#engine-electrical-system-repair-e9293__12-00-instructions-for-disconnecting)
5. Remove intake air manifold . See «11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S65)»(/bmw/m3/e90-2007-2013/remont/mechanical/#engine-repair-e9293__11-61-050-removing-and-installing) .
6. Remove secondary-air pump . See «11 72 000 REMOVING AND INSTALLING/REPLACING SECONDARY-AIR PUMP (S65)»(/bmw/m3/e90-2007-2013/remont/mechanical/#engine-repair-e9293__11-72-000-removing-and-installingreplacing) .
7. Remove ignition coil cover on left and right
8. Unlock all plug connections in electronics box and disconnect

Release nuts at cable duct (1).

Scheme 34

WORK STEP REFERENCE

Lower transmission

Release bracket on underside of transmission.

Lay wiring harness, oxygen sensor plug, oil level sensor and crankshaft sensors over bracket or right catalytic converter.

Feed out cable towards top.

Remove wiring harness.

Installation

Pay attention to cable routing/mounting points.

Now clear the fault memory.

12 61 280 Replacing oil pressure switch (S65)

Necessary preliminary tasks

1. Switch off ignition
2. Remove intake air manifold . See «11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S65)»(/bmw/m3/e90-2007-2013/remont/mechanical/#engine-repair-e9293__11-61-050-removing-and-installing) .

Unlock plug and remove

Remove oil pressure switch.

Installation

Tightening torque, 13 62 2AZ , see 13 62 SENSORS (S65) .

Scheme 35

Note. Check and clear fault memory.

12 61 285 Replacing engine oil level sensor (S65)

Necessary preliminary tasks

1. Switch off ignition
2. Remove reinforcement plate . See «31 10 010 REMOVING AND INSTALLING/REPLACING REINFORCEMENT PLATE (M3)»(/bmw/m3/e90-2007-2013/remont/axle-shafts/#front-axle-repair-e92e93__31-10-010-removing-and-installingreplacing) .
3. Drain off engine oil . See «11 00 ... SERVICE - ENGINE OIL (S65)»(/bmw/m3/e90-2007-2013/remont/mechanical/#engine-repair-e9293__11-00-service-engine) .

Unlock plug (1) and remove.

Unscrew nuts.

Tightening torque 13 62 3AZ , see 13 62 SENSORS (S65)

Remove oil level sensor (2).

Installation

Clean sealing face on oil sump.

Replace seal on oil level sensor.

An excessively low torque value will result in oil leaks.

An excessively high torque value will result in damage to the oil level sensor.

Top up engine oil.

Scheme 36

12 63 520 Replacing DME master relay (S65)

Necessary preliminary tasks

1. Switch off ignition
2. Open electronics box.

Remove DME master relay (1).

Scheme 37

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 the fuses have blown, replace them completely with the fuse holder
3. Find out why fuses have blown

Continue troubleshooting as per DIS instructions.

12 90 ... Removing and installing/replacing electronics box

Note. Follow instructions for removing and installing electronic control units

Necessary preliminary tasks

1. Read fault memory.
2. Disconnect negative battery cable . See «61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-repair-e9293__61-20-900-disconnecting-and-connecting) .
3. Remove microfilter housing . See «64 31 063 REMOVING AND INSTALLING/REPLACING RIGHT LOWER MICROFILTER HOUSING SECTION»(/bmw/m3/e90-2007-2013/remont/automatic-hvac-system/#heating-and-air-conditioning-repair-e9293__64-31-063-removing-and-installingreplacing) .
4. Remove tension strut on spring strut dome on right

Release screws (1).

Slacken nut (2).

Lift out right heater end plate (3).

Installation

Ensure gasket (4) is correctly seated.

Scheme 38

Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Lift out plug connection (2), fuse carrier (3) and wiring harness grommet (4) from electronics box (1).

Installation

Make sure wiring harness grommets (4) are correctly seated in electronics box (1).

Scheme 39

Unlock DME control unit at holders (1) and raise slightly.

Pull tab (3) in direction of arrow out of housing and disconnect plug connections (2) on DME control unit.

Scheme 40

If necessary, press locking tabs (1) in direction of arrow and pull contact carrier (2) out of housing.

Scheme 41

If necessary, press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.

Scheme 42

Unlock device holder (2) at holder (1) and remove.

Remove DME control unit (3).

Scheme 43

Unlock device holder (2) at holder (1) and remove.

Scheme 44

Remove device holder (1) from electronics box.

Scheme 45

Release screws (1).

Replacement

Modify water drain valve (2) and bump stop (3).

Scheme 46

Installation

Make sure gasket (1) is correctly seated on electronics box.

Scheme 47

12 90 100 Replacing fan for electronics box

Necessary preliminary tasks

1. Switch off ignition.
2. Follow «instructions for disconnecting and connecting battery»(/bmw/m3/e90-2007-2013/remont/gauges-instrument-panels/#engine-electrical-system-repair-e9293__12-00-instructions-for-disconnecting) .
3. Disconnect battery ground terminal. See «61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#general-electrical-system-repair-e9293__61-20-900-disconnecting-and-connecting) .
4. Detach fuse box in passenger compartment and pull back.

Pull back carpet.

Release lower nut on fuse carrier holder.

Pull holder slightly towards front.

Scheme 48

Disconnect plug connections for fan motor (1).

Release screws (2). Remove fan.

Scheme 49

Add final details to vehicle.

Read fault memory.

See also:
• 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY
• 61 21 BATTERY WITH TERMINAL
• ENGINE ELECTRICAL SYSTEM - SPECIAL TOOLS
• IGNITION WIRES, SPARKPLUGS
• ENGINE - SPECIAL TOOLS
• 13 71 000 REMOVING AND INSTALLING/REPLACING INTAKE FILTER HOUSING (S65)
• 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD
• 64 31 063 REMOVING AND INSTALLING/REPLACING RIGHT LOWER MICROFILTER HOUSING SECTION
• 61 35 ... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE)
• FUEL SYSTEM - REPAIR
• 12 31 ALTERNATOR
• 51 47 490 REMOVING AND INSTALLING / REPLACING FRONT UNDERBODY PROTECTION
• 11 28 010 REPLACING ALTERNATOR DRIVE BELT (S65)
• 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S65)
• 13 41 550 REPLACING IDLE ACTUATOR (S65)
• 13 62 540 REMOVING AND INSTALLING/REPLACING THROTTLE VALVE ACTUATING MOTOR (S65)
• 11 72 000 REMOVING AND INSTALLING/REPLACING SECONDARY-AIR PUMP (S65)
• 13 62 SENSORS (S65)
• 31 10 010 REMOVING AND INSTALLING/REPLACING REINFORCEMENT PLATE (M3)
• 11 00 ... SERVICE - ENGINE OIL (S65)
• ignition coils
• removing and installing control units
• instructions for disconnecting and connecting battery