Check the rear lamp assemblies and see if the terminals for the brake lamp are getting battery voltage with the brake applied. Check at the connector and the bulb socket, if you have it at the connector and not the socket then you will need to replace the tail/brake lamp assemblies. This is a very common problem on the jeep.
SOURCE: 2003 dodge ram deisel change fcm no change.still
sounds like fuseblock underhood is faulty..front control module is on fuseblock
SOURCE: Same issue. Side brake lights out but center works.
try replacing the turn signal switch, as the brake/tail lights are all routed thorough it. common problem with most 90's GM cars. this may help, but I've never seen only the third light work. sounds more like wiring has been tapped into incorrectly. good luck
SOURCE: divers brake light does not work with head lights on .
big problem with jeeps 98 and up should be a safety recall but is not; you need to replace the drivers side tail light assembly with a new one, from jeep or auto parts store if available. used auto parts recycler may have one but your taking a chance, used should be 40 to50
dollars new over 100
I’m happy to help further over the phone at https://www.6ya.com/expert/gregory_8e6ba270263743ac
SOURCE: 2003 Toyota Highlander.The brake light on the
Replace the right rear brake lamp. The bulb possible use two filaments one for brake and tail light. One burnt out filament in one bulb.
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