Workshop Hints

Workshop Hints

Battery Charging

As with previous models, a battery charger can be connected in the engine compartment to the battery junction point or directly to the battery in the trunk. The PM detects an external battery charger if the battery voltage is above 13.2 V for 1 hour without the engine running.

Following detection of external battery charging, a battery charge level of 80% is reported even if the charge level is higher or lower than that figure.

Cigarette Lighter Battery Charging Function

A trickle charger can also be connected to the cigarette lighter. However, the cigarette lighter is supplied by the body-zone consumer isolation circuit (VA-K) via a relay.

If the "terminal R Off" signal is present for more than 60 minutes, that relay will be switched off by the consumer shutdown function. That would mean that a charger connected to the cigarette lighter would be disconnected from the battery.

To prevent this, the consumer shut-down function can be deactivated. This is performed by the following procedure:

Slide the battery switch off and on again twice within two seconds.







The function is cancelled by: "terminal 15 On",switching the battery switch from "OFF" to "ON" or failure of the battery voltage to reach 12.6V after 6 hours of charging.

Diagnosis

All inputs/outputs that are part of the Power Module can be diagnosed by Test Modules or status checked by the Control Unit Functions of the Diagnosis Program. The outputs can also be activated by Component Activation and the power consumption displayed.

The Diagnosis Program is based on the E46 concept.

All electronic fuses and the electronic battery master switch are monitored for short circuits/circuit breaks. In the event of a fault, an appropriate entry is made in the PM's fault memory and, if appropriate, a check control message initiated.

Service Functions

Sleep Mode Activation

This function can be used to put the control units into sleep mode. The battery switch must be set to "ON" when using this feature. The Test module will indicate whether the function was successful or not.

Battery Replacement Registration (Must be performed any time a battery is replaced)*

This Service Function informs the PM that the battery has been replaced. It completes the following operations:

- The battery capacity is set to 80%.
- The current odometer reading is stored.

The odometer readings at which the last seven battery replacements took place can be read off from the Diagnosis Requests of Control Unit Functions.

- The stored battery statistics (current, voltage, battery charge level) are deleted.
- The stored temperature statistics are deleted.

Transport Mode Clearing

Vehicles that arrive at the BMW centers may have the Transport Mode cleared by using the Test Module under the Service Functions menu. Different from the Storage Mode,certain consumers such as the radio, interior lights, and electric windows (except drivers side) are permanently switched off.