BMW 7 Series: General Information On Intelligent Battery Senor (IBS)

NOTE: Do not connect the charger to the 12 V charging socket.

The 12 V charging socket is supplied with voltage by the rear power distribution box via relay. This relay drops out after terminal 15 OFF. This means that a trickle charger connected at the 12 V charging socket will be disconnected from the battery. Only charge the battery via the jump start terminal point. Only then can the power supply be registered by the vehicle.

WARNING: Danger of destruction in event of mechanical strain

• Do not introduce any additional connections at the battery negative terminal.
• Do not modify the grounding cable. The grounding cable also serves to dissipate heat.
• Do not establish any connection between the IBS and the sensor screw.
• Do not use force when disconnecting the pole shoe from the battery terminal:
  • Do not pull on the grounding cable.
  • Do not place any tools under the IBS to lever off the pole shoe.
• Do not use IBS connections as levers.
• Use a torque wrench and set tightening torque in accordance with repair instructions.
• Do not release or tighten down sensor screw (screw with Torx head).
• Avoid contact between IBS and ground.

WARNING: Danger of destruction to IBS and cables when battery is replaced

• The IBS and the cables can be destroyed by mechanical strain when the battery is replaced. Therefore avoid mechanical strain.
• The size (capacity) of the battery required for the car is coded in the Car Access System (CAS).
• Use the battery size (capacity) installed as standard when replacing the battery.
• Register battery replacement via Service functions in diagnosis system.
• Delete fault entries in the Digital Engine Electronics (DME) associated with battery replacement.
• Always proceed in accordance with the repair instructions.

NOTE: Battery draining possible in spite of the intelligent battery sensor IBS being fault-free.

• A battery can be drained (e.g. with lights or radio switched on) even when the IBS functions perfectly in conjunction with power management.
• For this reason, only replace the IBS when a corresponding fault entry in the DME or DDE.

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.

For example:

• If necessary, carry out ADJUSTMENT OF ACTIVE STEERING
• If necessary, activate SLIDE/TILT SUNROOF
• If necessary, activate power windows.

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

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