BMW X5: Battery Charging

If a normal or quick charger is used to charge the battery, the battery must be disconnected from the vehicle electrical system and removed. This prevents damage to paintwork and upholstery.

Ideally, battery charging is performed with BMW-approved charging computers.

IMPORTANT: In order to prevent the intelligent battery sensor from malfunctioning, the charging terminals in the engine compartment must be used without fail in vehicles from E60 and should be used if possible in other vehicles.

IMPORTANT: Before charging the battery while it is installed, first carry out a closed-circuit current test. If here the voltage is 10 V or less, one or more of the cells may be faulty or the entire battery may already be damaged. In this case, always remove the battery as escaping gases during charging could damage the interior equipment and trim. Attempt to regenerate faulty cells with low charging current.

If necessary, open existing plugs on the individual cells.

BATTERY OPEN-CIRCUIT CURRENT TEST

NOTE: Observe safety instructions for handling vehicle battery.

Fig. 154: Identifying Diagnosis And Information System

The open-circuit current test is performed using the Diagnosis and Information System (DIS).

DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD

WARNING: Observe safety instructions for handling vehicle battery.

IMPORTANT: Do not under any circumstances use force to pull/lever off Intelligent Battery Sensor (IBS).

Necessary preliminary tasks:

• Raise luggage compartment floor trim

Release screws (1).

Remove battery cover (2) upwards.

Fig. 155: Identifying Battery Cover

Loosen nut (1).

Tightening torque.

Disconnect battery negative lead (2) with IBS and secure at side.

Fig. 156: Identifying Battery Negative Lead

PERFORMING BATTERY "POWER RESET" (FOR PROGRAMMING/CODING CONTROL UNIT(S) )

IMPORTANT: Observe safety instructions for handling vehicle battery.

The following steps must be carried out for a "power reset":

• Switch off and disconnect battery charger
• Switch off ignition
  Cars with ignition key: Turn ignition key to 0 position
  Cars with identification sensor: Remove identification sensor from slot
  Cars with comfort access system: Make sure terminal is in 0 position
• Disconnect battery negative terminal
• Reconnect battery negative terminal (to ensure bus activity)
• Waiting time (5-10 seconds)
• Disconnect battery negative terminal
• Waiting time (1 minute)
• Connect battery negative terminal and tighten.
  Tightening torque.
• Connect and switch on battery charger
• Switch ignition on

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