Skip the auto shop - Our mechanics make house calls

Q: The car is not starting after I changed the aux cable in the stereo.

asked by on

After changing the stereo aux cable, the car is not starting. When I try to start the car, I hear loud cracking noise. Then, door lock doesn't work, some lights turn on automatically. The door lock works and the light turns off after I remove one of the terminal of the battery. If I just turn the keys on, after some seconds, the hazard light, headlight and dashboard lights starts blinking rapidly. After a while everything turns off. The same thing happens again if I turn of the engine and turn on again. I tried to find the short using multimeter. I disconnected the positive terminal and connected one end of the multimeter to positive terminal and another end to the removed positive wire of the battery. The short test showed 11.4 V. Then I removed fuses one at a time. But, the voltage reading remained same. Then, I removed all fuses and still test showed same voltage. Please provide me some suggestions. I am being totally helpless.
My car has a manual transmission.

To begin with, the lighting and door lock modules are very sensitive to low battery voltage. Once the battery voltage drops, they can start to do crazy things, making the car appear haunted. Door locks and windows may start to operate at random even while the car is parked. So, first you want to be sure the battery is fully charged. Second, you need to re-visit that stereo installation.

Check that all the connections are in accord with the factory system. The factory radio has a CAN (Control Area Network) line going to it. This is the line that all the modules use to communicate with each other. Since it tests at 12 Volts with a meter, many accessory installers mistakenly hook the CAN line up to an accessory radio. When this happens, the car can really exhibit some weird symptoms.

The CAN Line can be distinguished from the rest of the electrical system because it is a twisted pair of wires. It should not be hooked up to an aftermarket radio. Plugging the CAN line in where it should not be can damage one or more of the car’s control modules.

Beyond that, I suggest you get professional help. A certified mechanic, such as one from YourMechanic, can come to your location to inspect for electrical problems and suggest needed repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • The car is not starting after I changed the aux cable in the stereo.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Ignition stuck in on position and car will not start.

It sounds like you may have a bad ignition lock cylinder or ignition switch. I would have your mechanic come out and they can diagnose exactly what your starting problem is.

Q: 2016 Audi A3 1.8T loses accelerating power around 40mph, and upon acceleration, it jerks/sputters and slows down instead.

Hi there. With less than 20,000 miles, having acceleration issues on an Audi A3 is definitely not typical. It is likely that you have either an electrical glitch, caused by a fuel or ignition system sensor or electrical connection to...

Q: Load on truck's engine causes loud knocking noise

Hello. It sounds like there may be a problem with the piston or the valves in cylinder 5. Loose rod bearings to the piston can cause a knocking noise and/or a misfire condition. A worn out piston can also cause...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.