Questions tagged [automotive]

Questions about the design of electronics for use in an automotive environment. (Questions about the installation and use of automotive electronics are unlikely to be appropriate for this site.)

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Automotive wiring OR logic gate

I am wiring up taillights for my car and need to implement a OR logic gate, I understand how to do this using two diodes and a resistor, I don't know what spec components I will need. The circuit I'm ...
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1 answer
51 views

Simplest solution to automatically turning off dash cam when ignition is off, but turn it on with button?

I recently purchased and installed a dash cam in my vehicle (large truck). It requires three connections: ground, constant ~12V, and ignition/accessory ~12V. I have connected the dash cam to ...
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2 votes
0 answers
61 views

How to wire one switch that can turn on/off two independent switches [closed]

In my car I wired in a Front View Camera (Camera-A) that has it's own toggle switch (S-A) to manually turn it on/off, and has it's video displays on my Head Units Display. I also wired a Backup Camera ...
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Are UDS and OBD protocols in AUTOSAR software or hardware protocols?

Are UDS and OBD protocols in AUTOSAR software or hardware protocols ? I mean are they built upon other fundamental standard protocols like CAN for example or they are independent protocols with ...
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1 answer
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Why I am seeing 120 ohms resistance in obd connector Pin6 amd Pin16 and at ABS connector resistance between can+ and can- shows 60 ohms. Why?

I am seeing a resistance of 120 ohms between CAN high and CAN low at the OBD Connector between pin 6 and pin 14. I also checked the can bus resistance at the ABS/ESP module connector and it shows 60 ...
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2 answers
71 views

Keep a 12V led strip on for a few seconds

I connected a 12V led strip to the circuit of the cigarette lighter of my car. Unfortunately, when the car is turned on, the power is cut off for a few seconds (3-4s) and the led strip goes out. I ...
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1 answer
53 views

Negative to chassis or separate wire?

In automotive applications typically battery negative is connected to the chassis, right. This makes the chassis be at the same potential as battery negative, but when completing a circuit, ultimately ...
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2 answers
59 views

How to test if current reading functionality on multimeter is working

I have a new multimeter that I've tested the voltage of a 12v flooded lead acid battery with before. Today I tried to test the amps running on the battery, to see if there was parasitic draw. As ...
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-1 votes
2 answers
78 views

Are vehicle electrical components powered from the negative side?

still trying to get my head around electron flow as opposed to conventional current regarding automotive electrical circuits. There seems to be a ton of conflicting information/advice out there so I'm ...
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-1 votes
0 answers
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Automotive Power Supply Input Filtering Design

i'm looking for some critique and pointers for the power supply and filtering design that I have come up with so far. This is a personal project that I have spent a couple of weeks on in my free time, ...
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2 answers
58 views

Charging Power Banks from Electric Car Charging Stations (DIY, LiFePO₄)

Is it possible to charge my own Lithium-Ion Battery Bank from pay-to-use Electric Car charge stations? I’m traveling in an (ICE-powered) caravan. I have a 0.7 kWh Lithium-Ion Battery Bank and a 100 W ...
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1 vote
2 answers
42 views

Time optimum controller

I have a question regarding time optimization that I would be very grateful if you could guide me on it. The question is moving a car/mass with nonlinear forces acting on it from point A to point B ...
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1 vote
2 answers
76 views

How does adding a tweeter electrically affects the main driver?

I recently added a pair of tweeters to my car's front pair and what "baffles" me is that after adding them, I hear more bass besides the added highs, so my question is whether adding these ...
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1 answer
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How to control a 12V relay from variable voltage source of a LED?

I'm new to electronics and need your help. I have retrofitted a Chromecast to my car and have powered it using a cigarette lighter power adapter to USB. Currently the power adapter is hidden and ...
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1 vote
1 answer
77 views

Insulation monitoring device for electric vehicle

Good day to all! I am planning on designing an electric vehicle architecture from scratch. My main DC bus voltage is 400 V. However, I have got different voltages in my system. I have got a 600/400 V ...
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-1 votes
1 answer
116 views

Made a mistake when Jumpstarting the Car

I made a mistake in connecting the cables for jump start. Instead of attaching one of the negative cables to the negative pole of the donor battery and attaching the other negative cable to a metal ...
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17 votes
3 answers
2k views

What does an EV "wall socket charging cable" do?

Known as "Mode 2 charging", this method of charging electric vehicles describes the use of a common household wall socket and common mains voltage (230 v) to charge the vehicle. This is ...
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1 vote
1 answer
53 views

Converting a car receiver CD player to AUX using source selector IC

I have old Pioneer DEH-2800MPB car receiver (from 2005) and I would like to convert CD source to AUX input. I found the PML014A chip in the diagram, where the audio signal from the FM tuner and CD ...
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1 vote
3 answers
111 views

Driving Ignition Coil with Microcontroller

I am trying to design a circuit to drive an ignition coil in an automotive application using a microcontroller. The microcontroller operates on a 5VDC input and puts out a 3.3V and 4mA digital signal ...
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1 vote
0 answers
38 views

Practical usage of Automotive BMS with Active Balancing

I work as an intern at one of top semiconductor companies and also in automotive industry. Since I'm assigned to BMS (Battery Management System) team as a concept engineer I'm constantly looking for ...
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7 votes
6 answers
2k views

Power cutoff for car when power drops below 13V

I just bought a 2004 Explorer. I have a wireless phone charger and GPS plugged into the cigarette lighter port. The problem is this is always on even when the car is off so I'm forced to unplug ...
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0 votes
3 answers
137 views

What is voltage limit for 12V car bulb? [closed]

Cars do not have constant 12V voltage. So car bulbs should also be operable at those unstable voltages. My question - what are the limits for basic H7 halogen (or LED) bulbs used in cars? Could they ...
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0 answers
48 views

Swapping potentiometer gas pedal with hall effect ... signal voltage is the same but ECU has issues still

I’m doing a car motor swap (Nissan VQ37VHR into BWM E46) and would like to retain the OEM gas (a.k.a. accelerator) pedal. My initial investigations indicated the BMW pedal would work happily with the ...
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1 vote
2 answers
61 views

Horrible buzzing on custom car bluetooth

I've got an older vehicle that is wired for a CD changer. I'm using a few components to trick it into playing Bluetooth. Components MCP2025 Transceiver for car's LIN bus Regulates voltage (>12V ...
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0 answers
32 views

Can I use two different types of AGM car batteries connected in parallel?

I would like to use two different AGM car batteries in parallel but I don't want them to fight eachother. I've heard that they only fight eachother when they are not receiving a charge (discharging). ...
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0 votes
1 answer
65 views

Impossible current readings while measuring motorbike lamps

I own a motorbike that runs with a 6V (yes, 6V) electric system and I'm designing some LED lamps for it. My current design is dead simple, here is a falstad simulation, it's just two 1W 2.5V drop LEDs ...
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1 vote
1 answer
66 views

Input over voltage protection circuitry around RBO40 for automotive use

I have been digesting input power protection circuits for automotive use for several days now. There are a lot of snippets here and there with either complete info (no parts) or incomplete circuits (...
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0 votes
2 answers
88 views

Using a bench power supply to emulate car battery

I am currently working on a project that involves a fuel lift pump. I have been using a car battery to power the pump but am tired of having to charge the battery up over and over again. I tried ...
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0 votes
0 answers
85 views

Q: 4 Channel Optocoupler to convert auto 12V signal to 5V Arduino

I'm trying to connect an Arduino to my car. I'm planning on using the switched 12V (potentially 11V to 14.4V) car system as inputs into the Arduino. The Arduino will be running on 5V, provided by a ...
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5 votes
1 answer
165 views

Switch that resets when power is lost?

So I'm looking to install an aftermarket seat heater in my car (though this would be useful for many other automotive applications). The switch it comes with does not reset on power loss, so if you ...
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0 votes
1 answer
96 views

Calculating battery run-time to power a DC motor

I am working on designing a lithium-ion battery pack that will power a solar car that runs on a brushless DC motor. There are several pack configurations I am trying to choose between, and to do so, I ...
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0 votes
1 answer
48 views

LED Driver Advice Reqd

I'm looking to put LED strips into my converted van. Using some before, it wasn't long before they dimmed or individual leds failed. I was told it was because automotive voltage, especially on newer ...
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-2 votes
3 answers
101 views

Why do car blinkers seem to synchronize and then diverse from each other?

When I am on the road, the blinkers of other cars seem to sync together for a few clicks and then they diverse again. Is this just me seeing it wrong - so on fact they never sync - or is there some ...
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3 votes
0 answers
90 views

What is an "integrated self-opening load switch" actually called?

Here is a throw-away circuit to illustrate the behaviour I'm looking for: simulate this circuit – Schematic created using CircuitLab Basically a load switch, but during an over-voltage event ...
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0 votes
1 answer
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What pins in Radar ECU and Camera ECU should be detected for OC, STG, and STB faults and why?

A typical Electronic Control Unit(ECU) performs Open Circuit(OC), Short to Ground(STG), and Short to Battery(STB) Diagnostics on selected internal and external pins in the ECU. For example, consider a ...
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0 votes
1 answer
47 views

Grounding sensitive devices (ICs, logic level switches) in a vehicle (generator and battery) environment

In my project vehicle I will be using a buck converter that can take from 9 to 18V and output clean 12V. I will also need smaller regulators (12v to 5v) for couple of microcontrollers. I've heard ...
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0 votes
0 answers
66 views

Can anyone identify this chip? 14-pin DIP on car amplifier board - top marking L074D 039

Is on a car amplifier board. 2 of them. 1 for each channel?
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0 votes
2 answers
109 views

Latency time of LED automotive strobe light

I am trying to build an automotive strobe light for a two-stroke engine. The problem with strobe lights sold in the market is I have not been able to find one which works well at high RPMs. My ...
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0 votes
2 answers
66 views

Car door lock with 5v relay

i want to close and open car door lock. Somthing like this: Its 12v and 10amp : Fo running this device i just need to send puls for maximum 500ms . My question is this : for 500ms can i use this 5v ...
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0 votes
0 answers
25 views

Possible OBD-II/OBD2 connections for development phases

Is there any paper/document that summarizes all connection scenarios or cases when you are developing an OBD-II/OBD2 project for automative/car electronics? For instance, Scenario 1 : Real car -> ...
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0 votes
2 answers
61 views

Grounding buck converter in a vehicle

For my test project I need to use this isolated DC converter in a vehicle, activated by relay and routed to a 6 circuit fuse block. Can I route just the positive from relay to converter input and ...
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0 votes
5 answers
155 views

Can I make a car battery charger using an ordinary transformer or does the secondary winding have to have a center tap

I am a mechanical engineer with some electrical experience. I have a battery charger which has a center tap on the secondary winding and uses two diodes for rectification. When set on low it charges ...
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1 vote
1 answer
117 views

Can a battery electric vehicle be driven through a dust storm? [closed]

I would like to know if a battery electric vehicle such as a Tesla Model 3 automobile can be driven through a dust storm. Back during the Dust Bowl days of the 1930s, driving through a dust storm ...
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2 votes
4 answers
1k views

Can a car electrical system brown out? [closed]

I have been in discussion with a bmw mechanic that is claiming a cars DC electrical system cannot have a brown out. Their claim is that the system is set up in such a way that it is either on or off. ...
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1 vote
2 answers
127 views

Should battery be disconnected on both terminals?

I am building an EV and I was wondering, should I disconnect only positive or both main HV battery terminals? Which option do car manufacturers use? I don't see any disadvantages with disconnecting ...
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  • 383
5 votes
2 answers
963 views

Switch to ground using transistor

I am building an AVR-based diagnostic device for my old Mitsubishi car. To perform diagnostics you must short pin 1 (diag) with pin 4 (ground) on the car diagnostics connector to start a session; no ...
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0 votes
0 answers
54 views

Car Head Unit, relay, 12V

Given: a Head Unit that starts with a signal of voltage 12V, Relay Prowest 4120-1C-DC12V (12VDC, 1C, 40A / 14VDC) for switching the cigarette lighter, 12 volts from emergency button light :-), 12 ...
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1 vote
3 answers
150 views

Can an insulated copper wire oxidize down its entire length?

I was doing some electrical wiring on a trailer today and was surprised to see black instead of shiny copper when I cut and stripped a section from the middle of a long section of uninterrupted wire. ...
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0 votes
1 answer
50 views

Providing precise 12Vdc and 5A (approx) in a vehicle [closed]

I need to have a relatively high amp (5A or close) source in a vehicle, as clean as possible, at a constant 12Vdc without big bumps or fluctuations. I know the regulator does the job by default, but ...
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1 vote
0 answers
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Anyone know the manufacturer of this automotive connector?

This connector is part of a plug and socket used near the rear doors on the Tesla Model Y vehicle. I want to make a breakout harness for troubleshooting by plugging my cable in-line. Ideally, I'd like ...
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