Question about 1999 Jeep Grand Cherokee
I don't know how much it costs, but there are 2 ways to replace it. The right way, which involves taking off both headlamps, the grille, the grille support, the bumper cover and some big support bracket for the bumper cover. And then there's the easy way. Remove the right headlamp housing and right about the middle of the cover underneath where the housing was, smack it with the ball end of a ball peen hammer (no joke). Now you should be able to see where the relay is (it bolts to the frame or bumper or something). Smakck it again directly above the relay and remove it. If you're careful with this, the hole should be covered up by the headlamp housing when you put it back.
Posted on Apr 14, 2009
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Posted on Jan 02, 2017
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Trouble Code: P1491 You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.
Radiator Fan Control Relay Circuit Malfunction
Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test power to IGN) Radiator fan control relay is damaged or has failed PCM has failed
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