Noob inquiry Can anyone confirm the location of the negative battery terminal in the engine bay of the M340i? A friend needs a boost. Therefore, I need to know where the negative is on my car so that I may clamp the negative to the ground on his. The ambiguous BMW manual makes references to a “unique location” that means nothing (thanks BMW).
I assume it’s this protrusion even though it’s unlabelled, unlike the positive terminal. Anyone have certainty?
Yes, but I was referring to the ambiguous and erroneous diagram in the Owner’s Manual.
The positive terminal is well marked in the bay, making it simple to locate, and the handbook appropriately identifies its location.
However, the arrow for the negative terminal is pointing in what direction? It appears to be pointing to a portion of the chassis. I looked there in the engine bay, and there is nothing there.
I initially mistook them for terminals when they said that, however it’s actually simply a chassis bolt. The manual is thus obviously incorrect. The genuine negative terminal, which is directly behind the washer fluid tank cover, is visible in my and Yossi’s images, yet it isn’t even mentioned in the instructions, much less correctly pointed out with an arrow.
In This Article...
On a BMW 4 Series, where is the negative terminal?
Under the hood, there is a positive battery terminal, and on the left side of the frame, there is a negative post. When jumping, you connect jumper cables to these poles. Under the hood, there is a positive battery terminal, and on the left side of the frame, there is a negative post.
Where is a battery’s negative side located?
Track down the battery terminals. There are two metal connections on each battery. One has a plus sign (+) and the other a minus sign (-). The jumper cable set also includes positive and negative cables. The black one is negative (-), whereas the red one is positive (+) (-). Never attach the red cable to a vehicle’s dead battery or the negative battery terminal.
Which side of a car battery is positive and negative?
The red side of an automobile battery represents the positive terminal. Either the terminal or the housing it is mounted on can be red. It’s crucial that you never conflate the bad side, known as the black side, with the positive side.
What is that on the BMW battery’s top?
What I believe to be the key fob adaptor for charging the original fob is seen in the photo below.
I would be very grateful for any information on this setup. It can be found in the trunk of a 2009 E87 120i hatchback.
David, the grey object is plainly a battery. The positive terminal is accessible through a small red box, and the other terminal is connected to earth.
You will observe another red box (about 150 mm x 200 mm x 25 mm). This is the box in concern. Using knowledge of the approximate dimensions of the battery, you may identify it.
I think a key fob may fit in the two slots on the right side of the red box in the picture.
We would appreciate any assistance. Keep in mind that the smaller red box contains, I believe, a fuse or an off switch.
You will observe another red box (about 150 mm x 200 mm x 2.5 mm). This is the box in concern. Using knowledge of the approximate size of the battery, you may identify it.
You can see a wire termination if you look inside those slots. Those openings are only bare plugs for different wiring possibilities. A large multi fuse is what the large component covered in red actually is. A year or so ago, BMW performed a recal on select 3 series vehicles due to a poor battery connection, and while they were working on my 328i, they actually blew one of the main fuses, which made it take the technician two days to diagnose the problem.
Thank you, David I think you’re right. It is merely a block for distributing power. It is Part #61146971370, according to another forum.
I still need to know if it has additional fuses or any electronics that need to be coded in order to replace the battery.
Note (15/Jan 2015): There are no electronics; it seems to have extra fuses! (To be verified)
How can a BMW battery be jumpstarted?
- Connect one of the red clamps to the positive (red) terminal on your own BMW vehicle.
- Connect the other red clamp to the helping vehicle’s positive (red) terminal.
- Connect the negative (black) terminal of the assistance vehicle to the black clamp.
Are the positive and negative sides of every car battery the same?
Not knowing which side of your battery is which can be annoying, especially if you need to jump start your car and you’re running late for work or soon will be. Unfortunately, when it comes to automotive batteries, there isn’t a general design approach.
The connections on a car battery are not usually on the same side. Actually, even if you’re accustomed to seeing the terminals on top, that won’t always be the case. Both the long and short sides of the battery might have terminals.
Since some vehicles store the batteries behind the passenger seat and the terminals can only be accessed through cables that extend to an access point under the hood, you might not be able to locate the battery at all.
Of course, it’s crucial to know which side is which since, when there is juice in the line, you never want to connect a pair of jumper wires to the incorrect terminals. The best-case scenario is that you’ll microwave your radio like butter and that will be the end of your music listening.
Can a BMW battery be jumped?
Following the positioning of both vehicles, here is how to jumpstart a BMW: Determine the positive and negative terminals on each battery by removing the covers. Connect the first red clamp to the red (positive/+) connector on your BMW car. Connect the second red clamp to the functional battery’s positive terminal.
Why are there two batteries in BMWS?
The smaller 50mah battery in the first battery powers the starter during a cold start, while the larger battery heats up the e-CAT and all other electronics.
What occurs if the battery in a BMW dies?
After you turn off your BMW, your battery continues to run for a while. After you leave, it will continue to run your radio, lights, clock, and even the security alarm for the car. Electrical issues with your BMW could cause some components to turn off while others, like your lights, remain on, draining your battery. When you leave your BMW, make sure all electric components are turned off.
How do you distinguish the positive from the negative on an unlabeled automobile battery?
You can glance at the terminals to figure out which is the positive and which is the negative battery terminal. The plus (+) sign is typically printed on the lid of the positive battery terminal, which is typically red in color. The negative may feature a minus (-) sign on the front and be colored black.
Another way to know is to observe the colored wires leading to the terminal. Here are some more specific instructions on how to distinguish between different battery connections.
Do BMW batteries self-charge?
When the automobile is parked and turned off, a BMW battery won’t start to recharge itself. Only when the engine is operating and there is an energy source (alternator) available will the battery be able to recharge. The battery will ultimately run out of power and need to be recharged if you have plugged-in equipment that is using the battery while the automobile is switched off and parked.
Additionally, the car contains a mechanism for recharging itself, however this function is dependent upon the engine being operating. When the car is parked, just a battery with a finite capacity is being used as an energy source. Additionally, the plugged-in device is the sole item drawing power from the battery; the battery is not being recharged at all.
How can a BMW jump start another vehicle?
Hi. Since the battery is in the back of my 2008 328xi, I assume there are + & – connectors close to the engine. Can someone quickly walk me through the process of using my bmw to jump start a different car that isn’t a BMW? Any assistance would be greatly appreciated.
starting up Two jumper cables can be attached to the battery of another vehicle to start your BMW’s engine if the car’s own battery is dead. The similar approach can be used to assist with starting a different car. Use only jumper cables with clamp grips that are completely insulated. When the engine is running, do not touch any electrically live parts as this could result in a deadly accident. Follow the steps below carefully to avoid damaging either vehicle or raising any safety concerns.
vehicle has a voltage of 12 volts and a capacitance that is almost equal, measured in Ah. On the battery, you can find this information.
There should be no physical touch between the two cars’ bodies to prevent shorting.
Reference Communications Mobility 231 Recreational Navigation Tips for driving Controls A quick glimpse assembling the jumper cables Jumper cables should be connected in the proper order to prevent any potentially harmful sparks.
The positive terminal of the battery serves as a jump-starting connection on your BMW; see also the Engine compartment overview on page
15; the top; 215.
jumper cable to the battery’s positive terminal or to a terminal on the helping vehicle that aids in starting.
connect a plus/plus jumper cable to the battery’s positive terminal or a starting-assist terminal of the vehicle you want to start.
jumper cable to the battery’s negative terminal, or to the helping vehicle’s engine or body ground. A unique nut serves as the body ground or negative pole on your BMW.
Connect a minus/jumper wire to the battery’s negative terminal, the engine ground, or the body ground of the car you want to start.
regular manner. Wait a few minutes before trying again if the first start attempt is unsuccessful so the drained battery can recharge.
the linking order mentioned above. Check and recharge the battery if necessary. Never start an engine with spray fluids.