Q: Ecu not grounding ac circuit or fans for ac to work.

asked by on

Nothing ac related works except AC light when button is pushed. All fuses are good, if I bypass ecu circuit ac compressor works when button is pushed. But ac fans do not work. I have switched relays still nothing l. Ac was recharged from a certified mechanic, all ac parts are brand new as well.

My car has 260000 miles.
My car has a manual transmission.

Everything in the A/C system and heater is controlled by the A/C heat control panel module. If fuse 17 on the inside fuse panel and fuse 47 in the outside engine compartment fuse box are both good and the ECU scanned has not codes then you may have a bad A/C control panel. The only way to test the control panel is with a known good panel and that means to replace it with a new one or a known good one. If you need help having this checked, a certified technician from YourMechanic can come to your car’s location to inspect the A/C system and follow through with the right repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Ecu not grounding ac circuit or fans for ac to work.

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: ECU and related components

Your ECU would have to be programmed. Although it is possible nowadays for consumers to download the software from the OEM for a fee, you need an interface cable and knowledge of the programming steps. Once you add up the...

Q: Power steering and power brake stop working

Both the power steering and power brake assist are powered by your power steering pump. I would start by inspecting the level and condition of your power steering fluid. It is located about mid-way down the driver side front of...

Q: Won't shift into 5th or reverse

Hey there, thanks for writing in about your 1994 Honda Prelude. Go back to the shift linkages and check the integrity of the connections. Any looseness here will result in misalignment problems changing gears. Have this shifting problem inspected in...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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.