BMW 7 Series: Instructions For Disconnecting And Connecting Battery

Observe 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.

IMPORTANT:

• There is a danger of mixing up battery leads: If the battery positive and negative leads are the same color and you are in doubt, follow the polarity to the battery, then mark and cover the leads.
• The on-board computer and clock may lose your data.

General notes on disconnecting battery

• Do not disconnect battery leads and leads from alternator and starter motor while engine is running.
• 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.

• Disconnect terminal of BATTERY NEGATIVE LEAD from vehicle battery. Cover battery negative terminal(s) and secure.
• 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.
• When installing battery terminal: Tightening torque 61 21 1AZ.

After connecting battery

IMPORTANT: The scope of application of some systems may be restricted after a power supply interruption.

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

For example:

• If necessary, carry out ADJUSTMENT OF ACTIVE STEERING
• If necessary, activate SLIDE/TILT SUNROOF
• If necessary, activate power windows. See NOTES ON INITIALIZING POWER WINDOW REGULATOR.

Refer to the diagnosis system for further vehicle-specific information.

INSTRUCTIONS FOR OPENING CONTACTS AND LOCKS OF DIFFERENT PLUG CONTACT SYSTEMS

Notes

ABBREVIATIONS REFERENCE CHART

IMPORTANT: The contacts can be changed on ultrasonically welded plugs (1).

Ultrasonic-welded connectors (1) can be identified by the welds (2) on their longitudinal side.

Fig. 11: Identifying Ultrasonic-Welded Connectors And Welds

NOTE: Special tools referred to in the repair instructions below are contained in the following special tool kits:

• Release and pressing-off tool61 1 150
• will be replaced on 09/2005 by 61 0 300 (BMW) and 61 0 400 (MINI)
• Release and pressing-off tool 61 1 100 (engine)

Repair instructions for opening plug housings and removing contacts of different plug systems

Plug system D 1.5/D 2.5

• CIRCULAR PLUGS, 7-, 8-PIN, SYSTEM D 2.5
• CIRCULAR CONNECTOR, 13-PIN, SYSTEM D2.5
• CIRCULAR CONNECTOR, 20-PIN, SYSTEM D2.5
• CIRCULAR CONNECTORS, 4-, 7-, 10- 12-, 25-PIN, SYSTEM D1.5/D2.5
• INLINE CONNECTORS, 15-PIN, SYSTEM D2.5
• INLINE PLUGS, 8-, 12-PIN, SYSTEM D2.5
• IN-LINE CONNECTORS, 30-PIN, SYSTEM D2.5
• IN-LINE PLUGS, 20-PIN, SYSTEM D2.5

Plug system JPT/MDK/DFK

• IN-LINE PLUGS, 2-PIN, SYSTEM JPT ELA
• IN-LINE CONNECTORS, 2-PIN, SYSTEM MDK 3PLUS 2.8
• IN-LINE PLUGS, 4-PIN, SYSTEM DFK ELA

Plug system Elo/Elo Power

• INLINE PLUGS, 4-, 10-PIN, SYSTEM ELO
• IN-LINE PLUGS, 6- TO 50-PIN, SYSTEM ELO
• IN-LINE CONNECTORS, 3-, 6-PIN, SYSTEM ELO-POWER 2.8

Plug system LSK

• CONNECTOR HOUSING, LCC CONTACT (LOAD CURRENT CONTACT)

Plug system MQS/MPQ

• INLINE CONNECTORS, 6-, 8-PIN, SYSTEM MQS
• INLINE PLUGS, 2-PIN, SYSTEM MPQ 2.8
• CONTROL UNIT CONNECTORS, 25-, 35-, 55-, 83-, 88-PIN
• SOCKET HOUSING (RADIO CONNECTOR), HYBRID SYSTEM MQS/MPQ
• SOCKET HOUSING 42-, 43-PIN, HYBRID SYSTEM MQS/MPQ
• SOCKET HOUSINGS, 2X21-, 2X27-PIN, HYBRID SYSTEMS MQS/MPQ, ELO/ELO POWER
• IN-LINE CONNECTORS, 30-PIN, HYBRID SYSTEM MQS/MPQ
• SOCKET HOUSINGS, 5-PIN, 8-PIN, SYSTEM MQS/MPQ

INSTRUCTIONS FOR WORKING ON THE IGNITION SYSTEM

CAUTION: Always switch off ignition before working on ignition system.

When working on ignition system, always disconnect supply leads to ignition coils.

High tension! - High tension!

IMPORTANT: Hazardous voltages occur at:

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

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