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the third light works off the light cluster main wire at the rear so if there is power to the this light then there is a problem with the cluster link. check with a meter at the connector with the brake applied if power. then clean the plug to the cluster.
From 2006 to 2010, the Sonata's 3rd brake lamp requires the rear package deck be removed to access that bulb. 1. Remove the rear passenger seat bottom (remove two12mm bolts between the seat back and the seat bottom - tilt the seat back forward to locate these bolts). a. Press the two bottom front edge tabs to release the front of the seat bottom from the floor. b. Remove seat bottom & set aside w/two 12mm bolts c. Tilt both seat backs downward 2. Remove the left & right hand shoulder cushions (12 mm bolt at the bottom of each cushion) a. Remove seat belt from shoulder cushion guide at the top of the cushion b. Lift up and forward on shoulder cushions to remove them (if equipped with side airbags, disconnect wire harness connector). c. Set shoulder cushions aside w/two 12mm bolts 3. Using a small flathead screwdriver, pop out the 'SRS' button cover from the C pillar panels on the left & right hand side to access either the phillips head screws, 10mm bolts, or #30 Torque Screws a. Remove screws and set aside b. Using a standard flathead screwdriver, pop out the C pillar panels on both sides (clips hold these panels in place) c. Set these panels aside after removal w/screws/bolts 4. Trunk Access-way panels are held in place by phillips head screws (two at the bottom (left and right hand sides) and 4 to 5 at the top . a. Remove left and right hand panels and set aside w/screws. 5. Rear package deck held in place with two plastic clips (white, yellow or pink) a. lie on your back inside the trunk (trunk lid open to allow for more light). Looking through access hole find 3rd brake light wire harness connector & disconnect. b. locate package deck clips, one on the left and another on the right on the underside of the pckage deck c. Squeeze clips to push them out - package deck will come loose d. Remove package deck & remove 3rd brake lamp bulb socket (turn counter clockwise to remove). Replace bulb & reassemble in reverse order.
in the trunk or the 3rd brake light? trunk: remove the carpet cover, then 10mm bolts or wing nuts, pull tail light assembly out, twist bulb to remove. 3rd light. lay on your back in the trunk, locate and remove 2 10mm nuts, crawl into back seat pull up on housing. there will be a long plastic tab that will prevent you from pulling the housing all the way out, you can cut this and make this procedure easier, or remove the entire hat rack.
take it to the dealer, it will be the best 40.00 youll ever spend, heres why,they took a 3rd brake light and built a car around it,are you ready....... remove the back seat bottom andseat back, then open the trunk remove , if you can see them, the two screws under the package shelf, go back inside then remove the package shelf assy. unplug the 3rd b light,assy then you can access the $12.00 bulb, reassemble.. i did not make this up, but iv seen worse
Look in the owners manual...it should have access instructions for this bulb. Or, try calling (or stop by) a dealer. the "service consultant" or service manager should be able to quickly tell you how to access the bulb.