Questions tagged [electronics]

Electrical components that monitor or control the engine and other vehicle systems, or that provide entertainment, information, or network access. Engine Control Units (ECUs), their sensors, radios, navigation systems, and rain sensors are examples of *electronic* components. Compare with *electrical* components which distribute, switch, and consume electricity as a source of power – such as the battery, alternator, fuses, lights, starter, and sparkplugs.

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21 votes
6 answers
7k views

Why don't cars have circuit breakers instead of fuses?

While there are exceptions the majority of cars use fuses instead of circuit breakers to protect electronics and I'm wondering why circuit breakers are not more widely used. Is it practicality, cost, ...
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2 votes
1 answer
196 views

How to get a rough approximation of how long it would take to discharge battery almost fully when keep ignition on?

I want to do a simple 'test' to see if my motorcycle battery is draining too fast. I've heard that if you keep motorcycle ignition on over night, it will drain. But I could not find any single source ...
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1 vote
0 answers
28 views

Seat Mii: intermittent, now permanent electric power steering fault

One year ago I bought a used Seat Mii. From time to time I had problems with the (electromechanical, not hydraulic) power steering: it would stop working and its red light would come up. Turning off ...
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1 vote
0 answers
33 views

ECU leaks current

Im the proud owner of an ER-6F from 2009. I just tested my bike for leaking current and noticed it did. When pulling the fuses I found the ECU to be the culprit. I assume this is not normal. What do i ...
2 votes
1 answer
54 views

Question about cigarette lighter voltages/currents

My motorcycle of course has a 12V battery. I have been informed that the OEM Honda cigarette lighter is wired with an "inline 1A fuse". I'm considering ordering a phone charging USB adapter ...
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0 votes
1 answer
63 views

remote key lock unlock stopped working

I have a 2015 volkswagen passat tsi, the fob for locking / unlocking the car has stopped working. The led on the fob still illuminates. I tried replacing the coil cell battery (cr2032) on the fob, but ...
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1 vote
1 answer
22 views

My car stereo stopped playing any audio, but it seems to be functioning as normal otherwise

The OEM car stereo unit on my 2015 Hyundai accent stopped playing audio. I have gone through every single setting (like mute) and tried every single source (am, fm, USB, bluetooth) and nothing plays ...
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0 votes
2 answers
69 views

Overheated Resistor

I am running a 12 volt DC 25 watt 6 ohm resistor to excite the alternator in my car but it is extremely hot to the touch, could I reduce the heat output by adding another resistor of the same value, ...
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0 votes
0 answers
47 views

2013 Elantra hatchback gauge cluster issues

recently on a rather cold day I started my car in order to commute to work, I then noticed the complete lack of speedometer and the fuel gauge is all over the place. Engine temp gauge and tachometer ...
0 votes
0 answers
228 views

How to open the windows without ignition turned on

Car: Skoda Octavia y.99 Situation: I need to be able to open the windows (or atleast one window) on my Skoda without ignition on. Why: My car is a camper and it's super anoying to turn the ignition on ...
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1 vote
2 answers
114 views

Cars with too much fangled software

For cars with a push button parking brake, is there a universal method to unlock the parking brake, eg when a crucial circuit board malfunctions? For cars with a push button engine start and steering ...
-1 votes
3 answers
72 views

Does car service include diagnosing the problem?

I checked that car service checks many different parts like engine oil, filters, lights, brake, etc. I would assume they will tell you if something is not working. But will I be told also why ...
0 votes
0 answers
33 views

Tricking TPS signals with a Voltage Source

Good evening, I am trying to trick the TPS by disconnecting the two APP1 and APP2 signals and connecting them to a voltage generator that generates a voltage that is within the range of both APP1 and ...
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1 vote
1 answer
103 views

How modern electronic parking brake works? Do they consume power when parked and car is off?

This might be a stupid question, but lately I've been asking myself this question and couldn't find an answer on google. How modern electronic parking brakes work? Do they consume power when parked ...
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1 vote
1 answer
169 views

2015 Escape Ford Sync error - What the heck is this error icon?

I have a 2015 Ford Escape with the non-touch Sync. After working sporadically for the past year or so, my Aux input/USB/Bluetooth have completely stopped working. If I press the "Media" ...
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1 vote
1 answer
115 views

Safety around permanent trickle/float charger connection for car battery

I rarely use my second car, as a result, the battery often drains too much by the time I need it. I have a slow charge battery pack which works if I want to wait a while to get to the minimum level to ...
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0 votes
0 answers
87 views

What is this electrical component circled in blue in this engine bay?

I was wondering what this component could be. i couldnt post full size picture since it was over 2mb but full picture also showed a part that looked similar to the part circled in blue. i think that ...
0 votes
1 answer
453 views

Mitubishi Outlander 2018. Replacing SIM card

Whatever I'm doing I'm not find the SIM card in my car. I removed the glove box (and see the white computer behind it. I removed the plasic below the glove box and still doens't find the SIM card, or ...
1 vote
1 answer
63 views

2007 Ford E350 electrical problem

My 12 passenger ford E350 2007 occasionally (random times while driving for random duration 5 -40 minutes) loses power to the: dashboard stero and windows. What can be wrong with my car? How do I ...
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6 votes
3 answers
943 views

Control Systems of Modern Engines

This may be a bit of an odd request. I teach high school computer science, in part through game design. I have a student who wants to be an auto mechanic who was placed in my game design class because ...
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0 votes
1 answer
80 views

What is this wire connected to the back of my radio?

I'm hoping to replace the radio in my '05 Saturn Ion, so I pulled it out to see what connections it has. According to this website, this radio is compatible. I know I'll have to deal with the wiring ...
0 votes
0 answers
32 views

I found out that a CECM for a double decker bus was faulty.The new unit I tried to fit ended up giving same fault.Does the new unit need programming

The good second hand CECM I later fitted was able to down load and the fault fixed.Do I need to program the new unit.The Chassis Electronic Control Unit(CECM) is for a volvo double decker bus
0 votes
1 answer
87 views

Prevent Stereo Shutdown During Ignition

I've got a Honda Civic 2006 that I've recently added a nice aftertmarket Android Auto head unit to because I got used to the one I had in my old work car (a 2018 Audi A3). This unit works great, ...
1 vote
0 answers
37 views

2008 Toyota Prius Door Lock Problem

About a month ago, I noticed that my Prius started to chirp and unlock 5 times in a row whenever I used the proximity sensor on the handles (both driver and passenger side, but not the trunk). Shortly ...
0 votes
1 answer
50 views

Main relay click test results

Civic vti coupe 1999. I heard that you can test a main relay by checking for clock with each key turn. So every time you turn the key you will get hear one click. Here’s what I found: Lock to ...
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0 votes
0 answers
32 views

is this main relay faulty, what should I do now?

Civic coupe vti 1999 @ 163k miles. Cars not starting and have just inspected the main relay and can see one of the points seems to have worn to the point you can see blue underneath it. Will this ...
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1 vote
1 answer
150 views

Elusive cause to a lumpy idle

Having been around cars for a long time, this has me stumped. 2005 Renault Megane Estate with 1.4 K4J engine. Approx 125 000 km. Engine is restless at idle. Revs are unstable and feels like misfiring. ...
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0 votes
2 answers
297 views

Can you attach multimeter to battery terminals while car running/charging?

I cannot remember how but recently I blew the fuse on my multimeter. All I remember was the car was running when it happened. Can I attach the multimeter to battery terminals to check voltage while it ...
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1 vote
1 answer
376 views

How does a OBD II misfire detection monitor know "exactly" which cylinder is misfiring?

I do know that magnetic pick-up coils are used to detect crankshaft position and these sensors are used to tell which cylinder is misfiring. These magnetic pick-coils do not produce a smooth & ...
1 vote
0 answers
37 views

Loss of Window Control in an Old Car; Fix or Let It Go?

I have a car that is about 20 years old. (2001 Lexus RX300) I recently repaired the exhaust and some other things, and I think that mechanically, this car could last me 5+ more years. What to do about ...
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0 votes
0 answers
70 views

Renault Logan 2011 unknown electrical issue

I have a Renault Logan 2011 since March 2018 and it has run for about 173,000 km so far. About a year back it started having this strange problem where during initial start the automatic transmission ...
1 vote
1 answer
43 views

Toyota Yaris xp9 2006 Clock is inactive

I have Toyota Yaris xp9 Model 2006. When I start car. I do not see any more clock. It is totally off. Could you please inform me the reason why this fault happened and how I can repair it? Thank you.
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1 vote
1 answer
165 views

Volkswagen Polo 2009 bluetooth problem

I have a Volkswagen Polo from 2009 with some electronics I think are upgraded through the time. The display which shows the media radio and stuff also shows an option for phone, phone messages, and ...
0 votes
1 answer
74 views

Do I need a battery maintainer, a portable jumpstarter, or a completely new 12V battery?

Hybrid vehicle has not been used for several months due to COVID-19 pandemic. Vehicle has a 3 year old 12V AGM battery. Battery is not used as a true "starter" battery; it just boots the ...
1 vote
0 answers
53 views

Climate Control Module Temp Numbers Jump Around

I have a 2003 Hummer H2 and if I wanted to change the temperature in my vehicle, I would do so by turning the knobs on the vehicle's climate control module. One of which is for the driver side while ...
0 votes
0 answers
65 views

How does engine braking mapping work?

Some recent cars and a lot of bikes can change engine mapping and change engine braking electronically. For instance, my bike is not an automatic bike, so it has mechanical gears and I am able to ...
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0 votes
1 answer
113 views

What type of terminal pins do radio harnesses use?

Brief backstory: I got a car that was a great deal and the radio is the only thing wrong with it. They told me that while they were swapping out the OEM radio it wouldn't accept the new one and then ...
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0 votes
1 answer
122 views

Intermittent Electrical Issues Jeep Wrangler 1998

I just bought a 1998 Jeep Wrangler today. When I took it for a test drive yesterday, everything seemed to work fine, but when I was driving it home today some electrical issues came up. The first ...
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0 votes
0 answers
166 views

Alternator whine fix for aftermarket stereo

I bought a Dual MPR420 as a cheap replacement for my 22 year old Toyota Camry that I keep around as a utility car. I used the right Metra harness, spliced using heat shrink butt connectors and ...
1 vote
1 answer
156 views

Motorcycle USB Port on Accessory Switch while connected directly to battery?

I have a TW200, and I am wiring a usb port with a voltage read out. The only way to get a accurate reading of voltage is to connect to the battery directly. Testing with the low beam wire that comes ...
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3 votes
1 answer
252 views

How is alternator directly connected to vehicle electronics?

I've tried a lot of research but I can't find specifically what I'm looking for no one has actually mentioned this and I've looked at various wiring diagrams which still don't prove how this is ...
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2 votes
1 answer
58 views

How could a battery issue lead failures in ABS, Cruise control, stop-start, etc?

We have a 2014 VW Golf (diesel automatic) and recently we have started getting sporadic "christmas tree" errors when starting it. A few seconds after starting the engine, we get error after error ...
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0 votes
1 answer
212 views

2012 Nissan Murano interior light won't go off

2012 Nissan Murano interior light doesn't go off after door is closed. It does go off after 15 min. as it says in the manual.
1 vote
1 answer
66 views

powered window and back windscreen wiper anomaly

At first i thought it was random, then i realised that there is clearly a pattern: I start the car then i check and both the wiper and the window works as expected. 20-30-40 minutes down the road i ...
0 votes
0 answers
32 views

Why there is ticking noise and turn indicator lights blinking in car while driving even if I'm not touching the lever?

I own a Tata motors Indica DLS V2. I've noticed that there is ticking noise (similar to the one produced during turn signal) and turn indicator lights blink while driving, even if I'm not even ...
1 vote
2 answers
1k views

Electrical isues on j10 nissan qashqai

I have a problem with my Nissan Qashqai, its a late 2010 so its a facelift model. The lights flicker when I am driving, when im parked, basically all the time, my windows roll down slowly, some ...
1 vote
2 answers
53 views

How do I disconnect these plugs/connectors?

It's from a light indicator for my toyota security system.
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4 votes
2 answers
481 views

Should ground wires be fused?

I'm installing a ham radio transceiver into my car, which draws up to 25 amps and can't be used with the 12V socket. Instead, I'm following this and this and similar guides, which recommend running a ...
0 votes
0 answers
37 views

Car engine got wet through low water pass - any potential unseen damage?

Last night it was raining hard. There was a bridge that was flooded but I couldn't tell because the ruler marker sign was knocked down. As I approached it the car got deeper and deeper into water. ...
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0 votes
0 answers
54 views

What is this 5-pronged electrical outlet attached to the alternator used for?

I have the below hookup right next to the engine (CAT 3116) and I'm not sure what it is for. I tried googling this, but didn't find a hookup that was similar. The approximate circumference of the red ...
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