2011 BMW 7 Series Owner's Manual - Page 245

When the 12 volt battery is discharged, the ve‐ hicle electrical system is no longer supplied with electricity. The external start procedure sup‐ plies power to the vehicle electrical system and the vehicle can be started. When the high-voltage battery is discharged, the vehicle cannot be started. The external start procedure supplies charges the high-voltage battery to the point where there is sufficient electricity available to start the vehicle. The so-called starting aid terminal in the engine compartment acts as the battery's positive ter‐ minal. Preparation 1. Check whether the battery of the vehicle providing assistance has a voltage of 12 volts and approximately the same ca‐ pacity in ampere-hours. Capacity of the 12 volt battery of the BMW ActiveHybrid 7: 90 ampere-hours 2. Switch off the engine of the assisting vehi‐ cle. 3. Switch off any electronic systems/power consumers in both vehicles. Bodywork contact between vehicles Make sure that there is no contact be‐ tween the bodywork of the two vehicles; otherwise, there is the danger of short cir‐ cuits.◀ The body ground or a special nut acts as the negative terminal. 1. Pull off the cap of the BMW starting aid ter‐ minal. 2. Attach one terminal clamp of the positive jumper cable to the positive terminal of the battery, or to the corresponding starting aid terminal of the vehicle providing assistance. 3. Attach the other end of the cable to the pos‐ itive terminal of the battery, or to the corre‐ sponding starting aid terminal of the vehicle to be started. 4. Attach one terminal clamp of the negative jumper cable to the negative terminal of the battery, or to the corresponding engine or body ground of the vehicle providing assis‐ tance. 5. Attach the other end of the cable to the neg‐ ative terminal of the battery, or to the corre‐ sponding engine or body ground of the ve‐ hicle to be started. Starting aid terminals Connecting order Connect the jumper cables in the correct order; otherwise, there is the danger of injury from sparking.◀ 245 Online Edition for Part no. 01 41 2 603 958 - 03 10 500 Reference Mobility Communication Entertainment Connecting the cables Navigation Driving tips Controls High-voltage battery discharged At a glance The 12 volt battery is discharged