Under the fuse box cover under the hood left front next to battery. Markings are on the inside of the cover.
Trouble code P1491 means: Radiator fan relay control circuit
Could be the fan relay located on the drivers side frame below the battery.
radiator fan relay
Mounted next to the radiator.
Radiator fan relay control circuit
The cooling fan relay is under the hood on the drivers side in the fuse/relay box. The position of this relay is indicated on the underside of the lid for the compartment. The power relay for the cooling or the radiator fan is on the driver side front hood. You will have to take out the driver side head light and you will have to remove the front grill also. The power relay is mounted on the frame when you remove the grill. My van is 2006 Dodge Grand Caravan SXTt.
Dome lights
in power distribution center
UNder the air cleaner on the driver side "frame".
It is located in the relay/fuse center under the hood on the drivers side.
Trouble code P1491 means: Radiator fan relay control circuit Can I get a location?
on the left side top of the bumper behind the grill.