1. Diagnosis: Identify the Problem
* No heat at all: This could be a blown fuse, a faulty heating element, a bad switch, or a wiring issue.
* Intermittent heat: Similar to "no heat," but the problem is inconsistent, suggesting a loose connection or a failing component.
* Heat only on one side (of the seat): Points to a problem with the heating element on that specific side, or its wiring.
* Burning smell: This is a serious issue and requires immediate attention to prevent a fire. A likely cause is a damaged heating element shorting out.
2. Tools and Materials (You might need some or all of these):
* Multimeter: Essential for testing fuses, switches, and wiring continuity.
* Test light: Helpful for checking power at various points in the circuit.
* Wiring diagrams: Specific to your Lincoln LS year and model. These are crucial for tracing wires and identifying components. (You can often find these online via repair manuals or forums dedicated to Lincoln LS owners.)
* Replacement parts: These could include fuses, heating elements (often sold as complete seat cushions), switches, wiring harnesses, connectors, etc.
* Screwdrivers (Phillips and flathead): For removing panels and accessing components.
* Socket set: Potentially needed depending on the access required.
* Gloves and safety glasses: Protect yourself from sharp edges and potential electrical shock.
3. Repair Steps (General Outline – Specific steps depend on the diagnosed problem):
* Check the fuses: Consult your owner's manual to locate the fuse(s) for the heated seats. Replace any blown fuses.
* Inspect the seat switch: Test the switch using a multimeter to ensure it's functioning correctly. Replacement might be necessary if faulty.
* Check the wiring: Carefully inspect the wiring harness for any breaks, cuts, or loose connections. Repair or replace damaged wiring. This often involves removing the seat and potentially the seat cover. This step requires caution to avoid damaging the wiring further.
* Test the heating element(s): This is the most involved part. It often requires removing the seat cover (which can be a challenging task). Use a multimeter to test the resistance of the heating element. A faulty element will show an open circuit (infinite resistance) or a short circuit (very low resistance). If the element is faulty, you'll typically need to replace the entire seat cushion assembly.
* Ground connections: Poor ground connections can also disrupt the heating system. Check all ground points for corrosion or looseness.
4. Important Considerations:
* Safety First: Disconnect the negative battery terminal before starting any electrical work.
* Professional Help: If you are not comfortable working with car electrical systems, it is best to take your Lincoln LS to a qualified mechanic. Replacing heating elements often requires seat disassembly and specialized knowledge.
* Wiring Diagrams: Accurately identifying wires is crucial. Miswiring can lead to further damage or even fire.
* Seat Cushion Removal: This is a complex task and varies greatly by year. Searching online for "Lincoln LS heated seat replacement" along with your year will yield videos and tutorials that can be helpful.
In short: Repairing a heated seat is not a simple DIY task for most people. While diagnosing the problem might be doable for someone comfortable with basic electrical troubleshooting, the actual repair (especially replacing a heating element) often requires specialized tools, knowledge, and patience. If you are not confident, it's best to seek professional help to avoid further damage or injury.
