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If the horn isn't working have you checked the fuse for the horn? You need to check fuse 13, (20A) in the engine bay fuse box. I've added a link to a website for information on what fuse is where. Is it the sounder on the front of the vehicle you want to change or the button inside the vehicle? Changing the actual sounder is easy, the problem is often getting to it. The sounder is positioned in the right corner of the front bumper. To replace the sounder you will need to SAFELY jack up the vehicle and support it on a jack stand. Remove the front right wheel. Then remove the wheel arch liner. There is a pair of horns bolted to the frame each with a 12mm bolt. Remove the bolt and the wiring block connector for each horn and lift them out. Refit the new horns and block connectors. Test the horns work. Refit the wheel arch liner and the wheel. Lower the vehicle back onto the ground.
That's power to the junction block which is the power box for almost everything! I've seen so many things draw power on those lincolns, if your familiar with a volt meter I would hook it up in between the negative battery cable and pull all fuses one by one until you can narrow it down more then just the J/B fuse..
If you are refering to the 40 Amp Maxi Fuse located in the engine compartment fuse block, the "BTN" fuse is one of the MAIN circuits to your instrument panel fuse block. It provides power for:
electronic flasher, brake pressure switch, brake on-off (BOO) switch, door lock/unlock relays, park lamp relay, shift lock actuator, luggage compartment lamp, remote anti-theft personality (RAP) module, integrated control panel (ICP), dome/map lamp assembly, key in ignition switch, inhibit relay, powertrain control module (PCM) and the horn relay.
If this fuse is blowing, none of the things listed above will work. (and your car will not run). You will most likely find the short in the harness between the engine compartment fuse block and the instrument panel fuse block.
The wire you need to check is the RED/WHITE wire (large diameter) that goes from connector C-109 Pin 1 at the engine compartment fuse block to Connector C-240 Pin 6 at the instrument panel fuse block.
C-109 is located UNDER the engine compartment fuse block and C-240 is located BEHIND the instrument panel fuse block. To get to the actual connectors, you will have to remove the fuse blocks. However, you will most likely find the wiring harness rubbed through somewhere in the engine compartment and won't need to get to the connectors themselves.
The wiring diagram does not show a stand alone drl module for the 03 f150. However it shows 2 drl
relays located in aux. relay box #2 located behind the right side of the dash, left of the glove box.
Also there is the drl resistor located behind the grill, right of the left headlight. Relay #1 is fused at
fuse #5-15a in the fuse block under the left dash. Relay #2 uses fuse #26-10a under left of dash.
Hope this helps.
I always use a test light and check them all. Usly faster then looking up which fuse it is. Here is a diagram of fuse block anyhow. CIG stands for cigarette lighter.
they are both for the radio the first one shares a fuse with something else, if you have your owners manual look for the fuse block in the back of the book and it will tell you what it shares it with.
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