Skip the auto shop - Our mechanics make house calls

Q: Heater control system will not power up even though there is power to it

asked by on

The whole thing started with a penny in a lighter and I'm not sure if this was just a coincidence or not but I lost all interior lights,alternator,Battery,rear wiper motor. mileage meter and temp outside control and my whole heater system including Heater Power Radio and Cd player. Had a bad power surge in interior lights which I just found fuse and unplugged but still nothing working on the rest replaced Alternator and Battery and also got a second hand Heater Control Unit from Junk yard with no success

My car has 177317 miles.
My car has an automatic transmission.

Hi and thanks for contacting Your Mechanic. When the penny was in the cigarette lighter, the penny act as a conductor and shorted out the circuit. The cigarette lighter is either powered all the time or powered when the ignition switch is on, but either way, the cigarette lighter is tied through the ignition switch. Check the fuse box for power to it and ground. If the fuse box has power and a ground, then the ignition switch burned from the short in the cigarette lighter. This would explain that phenomenon light issue and all of the electronics failing in your vehicle. Check all of the wiring to the ignition switch and the main power to the switch. If there is power to the switch but no power coming out of it when the key is in and turned to ACC or ON positions, then the switch needs replaced. If the switch is working fine, then the fuse box has a short in it and it needs replaced. If you need further assistance troubleshooting your massive electrical outage in your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Heater control system will not power up even though there is power to it

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: Left rear running light

Hello. If one of your running lights is not operating, the first thing I would do is verify that the bulb is in working order. This can be done by switching it with the opposite side. A bulb can sometimes...

Q: I have a miss fire cynder 1 and 3 and also po 174 bank 2. And now my car is not starting. Can you tell me what caused it

Hi Jean. Code P0174 indicates that there is a lean condition detected by the Engine Control Module (ECM). A lean condition will be created if there is too much air, and not enough fuel, in the air fuel ratio (AFR)....

Q: Radio

Hi there. All car radios require at least one fuse in order to operate, but depending on the make and model in question (as well as the trim package for the vehicle), your radio may have multiple fuses. It's possible...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
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.