Question about 2002 Jeep Grand Cherokee

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Fan wont come on, i already jumped it to the battery and it worked, i cant find the relay heard its behind the pass. headlight, how long does it take to change by cutting the hole i need, im a good mech. bout how long?

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The Pulse Width Modulated (PWM) cooling fan relay is located below the right headlamp behind the bumper fascia.

  1. Remove front bumper and grill assembly.
  2. Remove 1 support bolt near front of reservoir.
  3. Remove 2 reservoir mounting bolts.
  4. Remove reservoir from vehicle to gain access to vacuum hose. Disconnect vacuum hose from reservoir fitting at rear of reservoir.
  5. Disconnect electrical connector at relay.
  6. Remove 2 relay mounting bolts and remove relay.

Posted on May 22, 2011

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If you use the Passenger Headlight solution and the wiring is not fried than you should be able to replace it in about 30 minutes. You might cover the hole when finished with duck tape just to keep the area clean.

Posted on Jun 15, 2011


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1986 dodge w150(power ram) headlight stuck on high beams. Also having trouble with passenger headlight not working. Already replaced Hi/Low dimmer switch.

Have you checked the relay in the circuit. You really need a schematic of the wiring diagram. Electrical can be tricky without the wiring diagram.

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My passenger side headlight wont work

the headlights are controlled by relays in the fuse box behind the drivers side strut tower. the location of the right side headlight relay is labeled under the top cover, try swapping the drivers relay to the pass. side to check that the relay is the problem.

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Where is the relay for the radiator fan is locat at.

The electric fan relay is USUALLY the suspect in cooling related problems on electric fan-equipped 4.0L WJ's. If you take it to the dealer, be prepared to pay. The authorized way to replace this relay is to pull the entire from bumper cover to gain access. The relay is located under the passenger side headlight. The shortcut is to cut an access hole in the plastic under the headlight.
I wish I could show you the authorized method and how to cut the access hole, however when I went to replace my fan relay (for the second time), I found that the dealer who did the work previously had cut a hole for me already - even though I was charged labor for them to remove the bumper cover.
For this second relay change my WJ has experienced now, my symptoms were simple to diagnose. My engine fan would remain on after shutting off the vehicle. Fortunately, I was the one driving the vehicle when this started happening (not the Mrs.). Basically, something goes awry in the fan relay, allowing a constant stream of 12v power to reach the fan - regardless of ambient temperature or key position. I promptly returned home and disconnected my negative battery cable to shut the fan off.
1.Remove the negative battery cable from the battery.
2.To cut the access hole for the relay, first you must remove the passenger side headlight. To do this, remove the jackscrew from the top of the headlight. The jackscrew is directly on top of the headlamp and does NOT screw into the radiator core support (see pic below). After the jackscrew is fully removed (this screw is roughly 6" long), grasp the headlight assembly and forcefully pull the headlamp outward. Unplug the headlight wiring harness. Notice the exising hole in plastic under headlamp on my WJ.

Headlamp Jackscrew
Click to Enlarge Headlamp Removed
Click to Enlarge
3.Unscrew the two screws holding the relay to the body.
4.There isn't alot of slack in the wire, but enough to pull the relay out of the hole and disconnect it. Note that the electrical plug has the same sort of locking clips as other locations in the engine compartment. Use caution releasing the locking click to avoid breakage.

Fan Relay mounted
Click to Enlarge Fan Relay unmounted
Click to Enlarge
1.Connect the new relay to the wiring harness. Be sure it is firmly seated.
2.Attach the relay to the vehicle body in its previous location.
3.Reconnect the headlamp wiring harness.
4.Insert the headlamp back into its original position.
5.Reinstall the jackscrew in the appropriate hole. Be sure to apply some pressure to the bottom of the housing while doing this to assure the jackscrew passes through the retaining loop on the back of the headlamp. If you miss this retaining loop, you run the risk of breaking it off when tightening the jackscrew.
6.Reattach the negatie battery cable to the battery.
7.Start the vehicle and let it idle until normal operating tempurature is reached. You should hear the electic fan kick on around 210°.

Jul 14, 2010 | 2000 Jeep Grand Cherokee

1 Answer

The headlights wont come on tried the fuses tried the wiring in the inside switch replace the bulbs what do i try now


Check the wiring harness behind the battery at the inner left fender. You will have to remove the battery to check this out. You are looking for a bad ground for the headlight circuit.
Make sure all fuses are good in both pass. fuse box and engine relay box. Use the inside lid chart as a guide. There should be headlight a relay(s) in there.

Hope this helps - Steve

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Jeeps had a problem with the fan relays and fans on those models. The relay is mounted inside the engine compartment behind the passenger headlight. Try removing the relay and jumping it out. If the fans come on when the relay is jumped, you can try replacing the relay to see if that fixes the problem. If the fans don't come on, check the wiring from the relay to the fans. You can disconnect the fan connector and jump power and ground directly to that to eliminate bad wiring. If it still doesn't turn on the fan needs to be replaced.

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make sure your not getting oil down into the holes where plugs go this can mess with the wires.Is it actually skipping?

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