I have a 09 jeep compass. check engine light is on.had it checked out code read 0481.cooling fan relay.i changed the fuse for that alsl changed 02 sensors as well.now i think its the coolant temperiture sensor but i cant find the location of the sensor.both fans work when sapose to but dont understand wy im getting the same code.

codes are OBDll and are available on line free. Google your code

OBD-II Code P0480 is defined as a Cooling Fan Relay 1 Control Circuit
The purpose of the electric cooling fan system is to provide extra cooling capacity to the conventional radiator cooling system on hot days, and/or when the A/C is on, and/or when the vehicle is being driven in stop and go traffic which causes insufficient air flow over the radiator. 25 years ago, most cars and light trucks utilized a mechanical cooling fan attached to the front of the engine to increase air flow through the radiator. However, as fuel economy and low emissions became a high automobile design priority, vehicle engine cooling systems incorporated computer controlled electric cooling fan systems and abandoned the less efficient mechanical cooling fan.
When code P0480 is triggered, the power train control module or PCM is commanding the cooling fan to operate, but the PCM is not seeing the proper electrical feedback from the cooling fan circuitry that would indicate the fan is operating properly.

Check your battery/alternator to be sure it is charging at about 14 volts. If not, the low charging can cause a P1491 code. The OBDII code reader can erase the code.

usually if you follow the fan wires back they should lead to the fan switch. If you look in your owners manual it will have diagrams and location of any and all fuse box and relay locations.

DTC P0481Cooling Fan Relay 2 Control Circuit .
You swaped what plugs ? Fan's ? That wouldn't change anything ! You need to know how these duel fan set up's work . With this code the fans will still work in low speed , not high !
Output driver modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the quad driver modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. If an improper voltage level has been detected on ODM B output 2, which controls the high speed, relay 2, and series/parallel cooling fan relays, DTC P0481 will set.
Do you know how to do automotive electrical testing ?
Diagnostic Aids
Check for the following conditions:
• Poor connection at PCM -- Inspect harness connectors for the following items:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal to wire connections
• Damaged harness -- Inspect the wiring harness for damage.
• If the harness appears to be OK, disconnect the PCM, turn ON the ignition and observe a digital multimeter connected between the Fan Relay 2 driver circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the series/parallel fan relay and the high speed fan relay. A change in voltage will indicate the location of the fault.
If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.


Relay Driven Dual Cooling Fan Diagnostics

code P1651 cooling fan 1 relay control circuit malfunction conditions. possible causes cooling fan relay 1 circuit is open short to ground or to battery plus. cooling fan relay 1 power circuit is open test cool fan 1 fuse or the related fuse link to G or maxi fuse. cooling fan relay 1 damaged or has failed. PCM has failed. replace cooling fan relay and fuse see what happens. code P0300 MEANS YOU HAVE MULTIPLE ENGINE MISFIRE DETECTED CONDITIONS.

Check fan relay. Remove passenger headlight, cut plastic to find relay. Replaced mine last night. Radiator fan spinning again. Was having temp spikes at start up and idling. Also bought coolant temp sensor but have not installed. Before I replaced fan relay, check engine light wasn't on. Now that the new relay is installed, light came on. Autozone and Discount Auto have an OBDII sensor you can borrow for free to read the codes stored on computer. Codes are generally stored when the check engine light comes on. Getting minr checked today. Will update solution later if needed. Relay was $55.

The relay in engine compartment fuse box.
For its exact location and wiring diagram,click the link below:----Hyundai Sonata cooling fan not working http://schematicsdiagram.blogspot.in/2012/02/hyundai-sonata-cooling-fan-not-working.html
---------------This will help.Thanks.

check your sensor that controls the cooling fans.may need to be replaced.

Hi!

The first thing you're going to want to do is get that trouble code read. Some auto parts stores do it for free or you can buy a code scanner. Likely culprit is going to be the cooling fan itself, the relay, fuse, or the wiring/connectors leading to/from the fan and PCM. It could also be caused by a failed coolant temperature sensor.

So get that code read and start some diagnostics. I would suggest you start by checking fuses, relay, wiring. Then use a digital volt meter to see if the fan is getting 12 volts. Then try hooking the fans up directly to the battery to see if they work.

If you need more help, just let me know. Good luck!