2014 jeep wrangler fan relay location

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Protected Component J1 40 Power Folding Seat J2 30 Transfer Case Module, Power Liftgate Module J3 40 Rear Door Module J4 25 Driver Door Node J5 25 Passenger Door Node J6 40 ABS (Pump) J7 30 ABS (Valve) J8 40 Power Memory Seat J9 40 Partial Zero Emission Vehicle (PZEV) Sec Motor, Flex Fuel J10 30 Headlamp Wash Relay, Manifold Tuning Valve J11 30 Sway Bar, Thatcham Lock-Unlock, Power Sliding Door Module J12 30 V2: Rear Blower Motor, Radiator Fan J13 60 Ignition Off Draw (IOD) - Main J14 40 Rear Window Defogger J15 30 V1: Rear Blower 30 V2: Front Blower 40 Front Blower J17 40 Starter Solenoid J18 20 Powertrain Control Module (PCM) Trans Range J19 60 Radiator Fan J20 30 Front Wiper (Low/High Speed) J21 20 Front/Rear Washer J22 25 Sunroof Module 1 20 Stop Lamp Switch, Center High-Mounted Stop Light (CHMSL) 15 Stop Lamp Switch, Center High-Mounted Stop Light (CHMSL) 2 20 Trailer Lighting Relay (Stop lamp) 3 20 Front/Rear Axle Locker Relay 4 10 Trailer Tow 2 Clock Spring 5 25 Power Inverter 6 20 Power Outlet No.1, Rain Sensor 7 20 Power Outlet No.2 (BATT/ACC SELECT) 8 20 Front Heated Seat 9 20 Rear Heated Seat 10 20 V1: Vehicle Entertainment System, Satellite Digital Audio Receiver (SDARS), DVD, Hands-Free Module, Radio, Antenna, Universal Garage Door Opener, Vanity Lamp 15 V2: Vehicle Entertainment System, Satellite Digital Audio Receiver (SDARS), DVD, Hands-Free Module, Radio, Antenna, Universal Garage Door Opener, Vanity Lamp 11 10 Climate Control System, Underhood Lamp 12 30 Amplifier 13 20 Cabin Compartment Node, Wireless Control Module, Siren, Multifunction Control Switch, Clock Module 14 20 Trailer Tow 15 20 Climate Control System, Rear View Mirror, Cabin Compartment Node, Transfer Case Switch, Multi-Function Control Switch, Tire Pressure Monitor, Glow Plug Module (Diesel), Heater Ventilation, Air Conditioning/Automatic Temperature Control (HVAC/ATC) 16 10 Occupant Restraint Controller (ORC), Occupant Classification Module (OCM) 17 15 Tail Lamp (Left), License Lamp, Park Lamp (Left) 18 15 Tail Lamp (Right), Run Lamp, Park Lamp (Right) 19 25 Auto Shut Down (ASD No.1 and No.2) 20 15 Cabin Compartment Node Interior Light, Switch Bank, Steering Control Module 21 20 Auto Shut Down (ASD No,3) 22 10 Right Horn 23 10 Left Horn 24 25 Rear Wiper 25 20 Gasoline: Fuel Pump 20 Diesel: Lift Pump 26 10 Power Window Switch, Driver Window Switch 27 10 Ignition Switch Feed, Wireless Module, Window Module 28 10 Powertrain Control Module, Next Generation Controller (NGC), Transmission Feed, Diagnostic Connector 29 10 Occupant Classification Module (OCM) 30 15 V1: Rear Wiper Module, Power Folding Mirror 15 V2: Front Wiper Motor, Diagnostic Connector 31 20 Backup Lamps 32 10 Occupant Restraint Controller (ORC), Trailer Tow 33 10 Next Generation Controller (NGC), Global Powertrain Engine Controller (GPEC) 34 10 Park Assist, Headlamp Wash, Compass, Heater Ventilation, Air Conditioning Module (HVAC) 35 10 Heated Mirrors 36 20 Power Outlet, Underhood Lamp 37 10 ABS, Electronic Stability Control, Stop Lamp Switch, Fuel Pump Relay High Control 38 25 Lock/Unlock Motors Circuit Breaker CB1 25 Power Seat Relay R1 Ignition (Run/Accessory) R2 Ignition (Run) R3 Starter R4 Ignition (Run-Start) R5 Transmission Control Module (TCM) R6 Hard Top: Rear Window Defogger R7 - R8 - R9 - R10 Automatic Shutdown R11 Radiator Fan Control

Table of Contents Show

Where is the cooling fan relay at?
Where is the fan relay on a 2012 Jeep Wrangler?
What happens when a fan relay fails?
Is there a relay for the radiator fan?

The OEM equipped fan on the JK Wrangler is a known weak link that can easily fail for a variety of reasons. While the Wrangler is touted as a vehicle that can traverse the toughest of terrains, the cooling fan is not sealed from the elements and can easily ingest foreign material, leading to fan failure. While the vast majority of fan related issues are indeed from a failed cooling fan, it is always a good idea to check components related to fan operation to ensure unnecessary money isn't spent replacing a perfectly good fan.

A malfunctioning cooling fan is a common problem on JK Jeep Wrangler models. The electric fan equipped from the factory has been known the be quite fragile and has failed on a number of Jeeps that see any kind of off-road duty. The fan motor is not sealed, so ingestion of any foreign material is a surefire way to kill your fan in a hurry. A malfunctioning cooling fan will not draw sufficient air through the radiator, leading to engine overheating and potential engine damage. Fortunately, sealed aftermarket fan motors are inexpensive and can be easily installed to allow miles of worry-free driving. Before assuming your OEM fan has gone kaput, a quick inspection of the fan and its related components can indicate why your fan may not be working properly. This article will outline several common components that may be causing your JK's cooling fan issues.

Materials Needed

Digital multimeter
Jumper wires
Garden hose/pressure washer (for cleaning)

Step 1 – Clean any debris
Before beginning diagnosis for a faulty cooling fan, ensure the fan and radiator are free of excessive dirt, mud, or debris. Many JK owners regularly take their Wrangler off-road and often drive through some rugged terrain. Unfortunately, while the Wrangler can traverse heavy mud, deep water, and sandy/dusty trails with ease, the cooling fan and radiator can often become compacted with muck and disrupt normal cooling operation. The electric fan can easily lock-up from any obstruction or short out from water ingestion. So, before tearing into your Jeep, make sure the cooling fan is clean, and has had adequate time to dry out.

Pro Tip
Spinning the fan by hand can give you a general idea of the fan motor condition. The fan should spin a few revolutions before coming to a slow stop. If the fan feels gritty or does not spin freely, the fan motor may be bad.

Step 2 – Inspect fan fuse
If the fan was submerged in water or packed full of mud/dirt, it is possible that the windings in the fan motor shorted out and blew a fuse. Similarly, the windings in the fan motor can melt and create excessive resistance, thus the computer will attempt to bump up the fan speed to compensate. As a result, the circuit becomes overloaded and blows the fuse. Check the cooling fan fuse in the Totally Integrated Power Module (TIPM) located under the hood. By removing the fuse, you can easily inspect if it is blown. If the fan was locked-up for only a short period of time, replacing a blown fan fuse will typically restore functionality. A JK that keeps blowing the fan fuse is often a sign of a damaged fan motor that should be replaced.

Figure 2. 60-amp cooling fan fuse from a 2008 JK Wrangler.

Pro Tip
The OEM fan motor is not sealed and can ingest water and debris, leading to corrosion and eventual fan failure.

Step 3 – Inspect fan relay(s)
It is always a good idea to inspect the fan relay(s) whenever the cooling fan is acting up. Relays are small electromagnetic switches that essentially transfer power from one circuit to another. Whether it be from exposure to temperature extremes or general wear, relays can begin to malfunction and "switch" intermittently, or flat out fail and stick in an open/closed position. The same relays are used throughout the TIPM, so swapping a fan relay with another relay and monitoring fan operation can indicate a faulty relay. Also, check the relay terminals and contacts to ensure they are not burnt or melted. Relays can also be tested using a battery and digital multimeter as shown in the video below.

Related Video: DIY How to Test Relays

Pro Tip
2007 to 2011 JKs use two different fan relays: the low speed relay is located in the TIPM at terminal K11 (see Figure 2), whereas the high speed relay is behind the driver's side headlight.

Step 4 – Temperature sensor
The Engine Coolant Temperature Sensor (ECT) is responsible for relaying coolant temperatures to the computer, which will activate the fan as necessary to keep coolant temperatures within an acceptable range. A lack of cooling fan functionality, or intermittent fan operation, can be caused by a faulty ECT sensor. An ECT sensor that is reading below the true value of the engine coolant temperature will not activate the cooling fan, nor will it trigger a cooling fan fault code. Wranglers built up until 2012 came equipped with a plastic ECT sensor that seemed to fail at an incredibly high rate, so Chrysler switched to an improved brass unit as pictured below. For approximately $30, it is not a bad idea to replaced this sensor every few years to ensure the engine coolant temperature is being measured correctly.

Figure 3. Engine coolant temperature sensor.

Step 5 – Testing fan
Applying 12 volts from a battery directly to the fan can give you an idea if the fan is functional. If the fan fails to operate when voltage is supplied, this confirms that a replacement fan is needed. If the fan operates with power supplied, measuring amperage draw with a digital multimeter can indicate whether or not the fan has an excessive draw that could be overloading the circuit. As previously mentioned, a fan motor with burnt or melted windings can have excessive resistance and be the cause of regular fan fuse failure.

Where is the cooling fan relay at?

The fan relay is usually located near the bottom of the engine compartment on a metal frame member. The metal acts as a heat sink to keep the fan relay cool. So, unplug the connector at the relay and repeat the check for power. If you get power, you've got a bum relay.

Where is the fan relay on a 2012 Jeep Wrangler?

In the 07-12 model, the high-speed relay was behind the driver side headlight. In the 2012+ the relay was relocated next to the master cylinder along the driver side of the engine bay.

What happens when a fan relay fails?

If the relay fails, it will be unable to supply power to the fans, and as a result they will not operate. This can lead to overheating, especially when the vehicle is at a stop, where there is no forward motion by the vehicle to pass air over the radiator.

Is there a relay for the radiator fan?

The cooling fan relay is an electromagnetic switch that controls the power supply to the engine's cooling fans. It ensures that the energy-intensive devices only run when needed, usually when the vehicle is immobile.

jeep wrangler fan relay location