Bmw 325i battery jump start

It is important to follow the proper procedure when jump-starting a BMW. 

A BMW is jump-started by connecting to the jump terminals in the engine bay.

Do not connect the jump box or jumper cables directly to the battery. 

What you will need

Procedure

1. Remove the metal blade from your BMW key fob.
2. Use the metal key to unlock the driver's door manually. Newer BMWs have the keyhole on the driver's door covered with a small cap. Use the metal key to pry out the key cover. 
3. Open the hood by pulling the hood release under the dashboard. Pull the hood release twice. 
4. Locate the terminals in the engine bay designed to jump-start your BMW. You will notice a RED plastic cover with the + symbol on top of the positive terminal. 
5. Connect the red (positive) jumper cable to the positive terminal.
6. Connect the black (negative) jumper cable to the ground terminal on the vehicle frame.

   Watch video on how to connect jumper cables to a BMW.

7. Get inside the car, turn on the ignition but start the engine. This will allow modules to power up. Wait 10 seconds, then try to start the engine. 

BMW Won't Jump Start

If all you hear is a click, check the jump starter clamps are making good contact. Ensure the jump box is fully charged.

The battery in the car may be completely discharged. Keep the jumper cables connected for at least 15 minutes, then try again. 

Symptoms

Common symptoms that you may experience if your BMW battery is dead.

• BMW won't start
• Can't unlock the car
• Lights too dim (Check headlights)
• BMW turns over slowly
• Slow engine crank
• Dashboard Warning Lights on
• You can't start the car with the Push Start button
• Engine cranks slowly, then stop.
• Click, Click, Click noise.
• Electrical Issues

Notes

If your BMW is over 7 years old, you are driving on borrowed time. Sooner or later, you will need to replace the battery.

You can replace a BMW battery yourself. Just make sure to perform the battery registration procedure.

Frequently Asked Questions

How to get into the trunk, if you have a dead battery

Many BMW owners ask how do I get into the trunk if the battery is dead.

Use the jump-starting terminal under the hood to power up your BMW, then unlock the trunk. 

These instructions work on all BMW models, including 1-series, 2-series, 3-series, 5-series, 6-series, 7-series, X1, X5, X6.

BMW battery is dead, and the trunk won't open.

BMW engineers have made it difficult to get access to the trunk when the battery is dead.

You don't want and shouldn't jump-start a BMW directly from the battery.

This is a common mistake many roadside assistance technicians make. 

If you read on BMW forums, you will find hundreds of cases where control modules were damaged by improperly jump-starting a BMW this way. Costing car owners thousands of dollars in repair. 

How to charge a dead BMW battery 

Replacing the battery on a BMW is expensive because not only do you need a new battery, but it also needs to be registered.

The typical cost of a BMW battery replacement range is $400-$500. 

Before you spend hundreds on a new battery, we recommended using a trickle battery charger to bring the battery back to life instead of jump-starting the car and letting the alternator charge the battery. 

By trickle charging a dead BMW battery, you have a better chance of bringing the battery back to life. Otherwise, your BMW may no longer hold a proper charge. 

Use the OEM BMW Battery Charger or even the cheaper Black+Decker BBM3B 12V Battery Charger Maintainer, which works just as well.

It will take at least 24 hours to bring a completely dead battery back to life.

You are only providing 2 Amperes to the battery, which is a slow charge but ensures no damage is caused to the battery cells. 

Don't leave the keys in the ignition as your BMW charges.

BMW Battery keeps dying

If your BMW keeps on dying or is not holding a proper charge, it could be due to any of the following: 

• Battery Age / Old Battery
• Corroded or Loose Battery Connections
• Parasitic Current Drains in the electrical system.

Symptoms

• BMW Won't Start,
• Engine won't turn over,
• Clicking noise but not starting

What you will need

Procedure

1. Turn off the ignition. Remove the key from the ignition. BMWs are very sensitive to voltage, and BMW 3-Series is no exception. To avoid electrical problems, start by removing the key from the ignition.
2. Open the hood. Locate the hood release underneath the dash. Pull the lever until you hear the hood pop open. Next, you need to release the hood safety latch at the front of the hood. 
3. Locate the terminals where you can jump-start your BMW 3-Series. They are on the passenger side of the engine. 
4. Connect Positive, Attach the red (positive) cable to the positive jump start terminal. If you are using another car to jump-start your BMW 3-Series, you will connect the red clamp here. 
5. Connect the black (negative) cable to the ground post, which is the negative terminal. 
6. Start Engine.  If you are using a jump box, you are now ready to start your BMW. If you are using jumper cables to start the car, continue to the next step. 

These instructions will help owners of BMW 316i, 318i, 320i, 323i, 325i, 325xi, 328i, 328xi, 330i, 330xi, 335i, 335is, 335xi, 320d, 320xd, 325d, 330d, 330xd, 335d, M3, and M3 GTS.

If the battery on the BMW 325i is discharged to the point that it can no longer generate sufficient power to start the car, you can use another car to jump-start the dead battery. Once the 325i is running, the alternator will recharge the battery. As long as the battery is not damaged, allowing the car to run for several minutes should be sufficient to recharge the battery.

Position the car you will use to jump-start the dead battery close enough to the BMW 325i to allow the jump leads to reach both batteries. Ensure that the two vehicles do not come in contact with each other.

Turn off the engine of the support vehicle.

Open both vehicles' bonnets.

Lay out the jump leads so the two clamps on each end of the jump leads are not touching.

Remove the cover of the BMW's auxiliary jump-starting terminal. The terminal is located on the passenger side of the car, near the firewall. The cover is marked with a "+."

Connect one positive jump lead clamp to the positive terminal on the support vehicle's battery.

Connect the other positive jump lead clamp to the BMW's auxiliary jump-starting terminal. If you cannot locate this terminal, attach the clamp to the positive terminal of the BMW's discharged battery.

Attach one negative clamp to a suitable ground point on the support vehicle. This can be any location that is connected to the vehicle's frame. Most vehicle's are equipped with a special jump lead ground attachment point. If you can't locate a suitable connection point, connect the negative clamp to the negative terminal of the support vehicle's battery.

Attach the other negative clamp to the grounding nut on the BMW. This is a special feature on the 325i. The nut is located close to the BMW's auxiliary jump-starting terminal and is attached to the car's body. If you can't locate this nut, attach the negative jump lead clamp directly to the negative terminal on the discharged battery.

Start the support vehicle and let it run for several minutes. Lightly press the accelerator to increase the engine idle speed. This will speed the charging process.

Start the BMW 325i. If the engine will still not start, wait several more minutes and try again.

Remove the jump leads from the two batteries in the reverse order of how you attached them.

Thank you, hunter, for confirming what I thought.

154E90, you've likely got the problem fixed. Hopefully, the dealer installed the new battery, registered it with the computers, and cleared all the low voltage codes, etc.

You don't need to buy batteries from the dealership, but when you do, you'll be sure that they are the correct specification for your car. Your car needs a particular type of battery, and the new battery needs to be registered with the computer which controls charging. If you pick up a battery at the local Autozone, there's a good chance they'll sell you the wrong battery, and it damned-sure won't get registered with the DME. A good BMW specialist independent will get you the right battery, and register it correctly, like the dealership.

You certainly don't need to buy all your parts at the dealership; forum sponsor RM European sells OEM (original equipment manufacturer) parts, generally much cheaper than dealer parts. Sensitive electrical parts, particularly sensors, I always want in a BMW factory box. Never buy BMW parts from the likes of Autozone or Napa, until you know exactly what you want. In example, Napa actually sells Bosch Factory reman alternators - but if you don't insist on this, they'll sell you a cheap local rebuild. RM European or Pelican won't sell you the crap part.

You're on the right track, for taking care of your car: You're willing to buy the right parts, and willing to seek out the information you need to find them.

If the battery on the BMW 325i is discharged to the point that it can no longer generate sufficient power to start the car, you can use another car to jump-start the dead battery. Once the 325i is running, the alternator will recharge the battery. As long as the battery is not damaged, allowing the car to run for several minutes should be sufficient to recharge the battery.

References

Things You'll Need

Warnings

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