According to my memory, terminal 15 is a voltage detecting output that is utilized to keep engine auxiliary devices like the cigarette lighter, radio, and air conditioning off while the engine is starting. An “Unloader Relay,” which is often controlled by terminal 15 and doesn’t turn on until the alternator is actually functioning and creating output, normally regulates the supply to these.
One of the relays may be the issue if you are experiencing issues with devices that the unloader relays power.
One is in the E box, and the other is in the boot/load area on the RHS, behind the trim and above the battery. There might be more.
These relays come in varying sizes and locations depending on the models, options, markets, RHD vs LHD, etc.
Although the “Newtis” WDS can be a bit of a maze to navigate, it will still be helpful in this situation.
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Every few weeks, the startup error “Drivetrain malfunction, drive moderately” will occur, but after that, everything will operate as usual. Error only displays at launch and disappears on its own after a short distance. The issue has never happened when the car is moving, even though I’ve disabled stop/start as a precaution. The ensuing codes are displayed:
- 1C0202 – Short circuit to earth on the engine oil pressure control valve
- 120408 – Shutdown as a response to boost pressure control
- Lambda probe heating following a catalytic converter short circuit to ground (12B102)
- Air mass meter, electrical fault signal (102A01)
- 1D2402 – Short circuit to ground in the map thermostat control
BMW part number 12638645514, Integrated Supply Module/Power Distribution Module, should be changed.
either $30 from fleabay or about $100 from the typical suspects. I chose new out of caution; if I had to do it again, I would have purchased a used one.
- The component is easily accessible on the driver’s side strut tower engine compartment wall.
- Snapping out the module actually involves removing the PDM/ISM carrier from the vehicle. It’s preferable to use a plastic pry tool or a screwdriver because the snaps are rather stiff.
- The bottom electrical connector locking clip is challenging to remove in-place; it is much simpler to take the module out before picking at the connector.
- Because I used locking pliers and picks and was extremely cautious with the flimsy plastic clips, this took me thirty minutes. It just takes ten minutes if you have better hands than I have.
I would assume this is a starting relay issue in any other automobile. My best opinion is that the starter may be utilizing too much power, causing the DME to brown out and resulting in all the aforementioned random shorts at Terminal 15N, which is post-start ignition on.
The ISM/PDM, forward electronics/fuse box, and aft electronics/fuse box all switch terminal 15N. Since I began at the source (ISM/PDM), the error hasn’t happened again in six months.
How do you shut off a BMW at terminal 15?
By pushing the START-STOP button, Terminal 15 can be turned off and changed to Terminal 0 in status. If any of the following circumstances take place, Terminal 15 is automatically turned off: Double-locking the vehicle using the double-lock command
On a BMW, what is Terminal 50?
The starter motor activation voltage comes from CAS at terminal 50. The most common initial cause of a burned CAS module is a subpar engine ground cable. In order to determine whether there is activation voltage at the starter motor and, if not, to examine the CAS module.
If you have the time, I’d want to hear the theory behind this. I can see that the internal cas relay likely uses a diode to connect terminal 30 to 50 to the white relay in your photo. I don’t have a schematic for a circuit. Why would this occur if the engine ground was bad? It is impossible for the burned-out diode in your photo to be the one connected to the terminal 50 o/p. The tiny track is burned, and that is presumably the relay coil diode since it is too small. Why did this occur?
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.
What is terminal 30 for VW?
A wire or circuit that has constant battery voltage is referred to as terminal 30. If the battery was disconnected or died, this defect stores it. Typically, the problem is innocuous, sporadic, and doesn’t spark a fire. If it returns after being reset, you should examine the module’s power source.
The best way to jump a BMW
- 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.
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.
What occurs if a BMW battery is not programmed?
Registration is necessary so that your vehicle is aware of the modified requirements and is able to adapt to the new battery settings. Otherwise, improperly coding your BMW battery could lead to a variety of electrical issues, including a reduction in battery life, the risk of overcharging or undercharging your battery, or, in the worst case scenario, serious harm to your car’s alternator and electrical system, which could cause your battery to fail before its time.
What kinds of electrical issues could there be? As a result of your automobile assuming that the battery life is low and attempting to conserve it, several modules of your BMW may turn off. So, at that time, it’s possible for your windows and mirrors to not close or open, your radio to not function, your interior lighting to not function, or other modules that are not required for starting or operating a car to fail.
Can a BMW be jump-started safely?
DO NOT let any roadside assistance agency install a new battery in your BMW, and DO NOT jump start the vehicle. It might cost more than any other battery or jump start you’ve ever purchased.
How can I reset my BMW now that the battery has been changed?
One of the vehicles with the most advanced intelligent operating system in the world is the BMV. Therefore, the first thing you must do after every hit or replacement of an object in the car is to restart the entire vehicle.
This setup enables the computer to anticipate your next replacement requirement and alert you to it. After changing the battery, resetting the BMW computer is a quick and easy process.
- First, turn on the controller again.
- Step 2: Press “Trip” to activate it and make it light.
- Step 3: Hold down the “trip” button while continuing to press and hold it until the “Reset” button shows up on the screen.
- Reset in Step 4
Is Terminal 30 in good shape?
A supply with a permanent positive and terminal 15 is often required for every modern CAN bus towing module (switched positive). However, terminal 15 is frequently linked incorrectly to terminal 30. (permanent positive). The issue stays undetected because the trailer continues to work, but it can quickly become problematic.
The problem won’t be discovered even if the car is relocated every day. The battery, however, drains if the car is stopped for more than two days since the control unit doesn’t go into sleep mode and keeps the car’s CAN bus running. In conclusion: The car won’t start anymore!
What is a relay’s Terminal 30 for?
The battery is attached to terminal number 30. Therefore, current flows from terminal 30 out terminal 87, which is linked to the device we want the relay to regulate, in this case an electric motor, when the magnetic pulls the two internal switch contacts together. This makes the engine turn on since it is grounded.
Are BMW batteries really required to be registered?
Battery registration is necessary since all of the more recent BMW models include Intelligent Battery Sensors, or IBS, as they are known by BMW. Are you unsure if your BMW has IBS? This useful guide to model years and particular models will help you determine whether your BMW has to have its new battery programmed each time it is replaced.
- Seven-Series E65/E66 chassis from 2002 and after
- 6-Series E63/E64 chassis from 2003 and after
- 5-Series E60/E61 chassis from 2004 and after
- X5 E53 chassis with N62 engine, 2005 and newer.
- 3-Series E90/E91/E92/E93 chassis from 2006 and after
- X5 E70 chassis from 2007 and after
- X6 E71 chassis for years 2008 and beyond
Why won’t my BMW start despite clicking?
When trying to start your car, a loud clicking sound may indicate an issue with the electrical system. It’s possible that your battery is dead or that the alternator, which charges the battery, is malfunctioning.
The starter, a small motor powered by the battery that starts the engine, is unable to maintain power if the clicking noise is electrical in origin. Instead, it makes a clicking sound and switches on and off quickly.
Remember that in situations like this, a misfiring starter is really a symptom and not the root of the problem. Your automobile’s electrical system is probably to blame, which is why a jumpstart could briefly move your car.
Once it’s operating, have an experienced technician inspect the entire electrical system. Your alternator or battery might need to be replaced. Alternately, the issue might be resolved by simply cleaning the battery terminals of corrosion to improve the battery’s connection.
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