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B1B98 Lincoln Code - Seat Tilt Up Switch Signal Stuck High

Quick Answer

The diagnostic trouble code B1B98 indicates that the seat tilt up switch signal is stuck high, meaning that the signal from the seat control switch is continuously active or engaged. Common causes include Faulty Seat Control Switch, Seat Control Switch harness is open or shorted, Poor electrical connection in the Seat Control Switch circuit. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
B1B98 Lincoln indicates Seat Tilt Up Switch Signal Stuck High.
Common causes
Common causes include Faulty Seat Control Switch, Seat Control Switch harness is open or shorted, Poor electrical connection in the Seat Control Switch circuit.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Jan 26, 2026
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Code B1B98 Lincoln Description

The diagnostic trouble code B1B98 indicates that the seat tilt up switch signal is stuck high, meaning that the signal from the seat control switch is continuously active or engaged. This condition can arise if the seat control switch is pressed for more than two minutes or if it remains active during the vehicle's self-test routine. The Driver Front Seat Module (DSM) monitors the seat control switch's status, and when it detects that the signal is not returning to its normal state, it triggers this code. This issue can lead to various performance concerns, including the inability to adjust the driver's seat properly, which can affect driver comfort and safety. If ignored, the problem may worsen, potentially leading to further electrical issues within the seat control system or even affecting other related systems in the vehicle. Long-term neglect of this code could result in increased wear on the seat motor or other components, leading to costly repairs down the line. Additionally, the constant engagement of the seat motor could drain the vehicle's battery, especially if the vehicle is not in use for extended periods. Therefore, addressing the B1B98 code promptly is crucial for maintaining both the functionality of the seat adjustment system and the overall electrical health of the vehicle.
OBDII Code B1B98 Lincoln - Seat Tilt Up Switch Signal Stuck High
B1B98 Lincoln Code - Seat Tilt Up Switch Signal Stuck High

Common Causes of B1B98 Lincoln

  1. Faulty Seat Control Switch
  2. Seat Control Switch harness is open or shorted
  3. Poor electrical connection in the Seat Control Switch circuit
  4. Malfunctioning Seat Motor
  5. Defective Driver Front Seat Module (DSM)

Symptoms of B1B98 Lincoln

  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Driver's seat unable to adjust up or down
  3. Unusual noises from the seat motor when attempting to adjust
  4. Seat position remains fixed despite attempts to change it
  5. Intermittent or erratic seat adjustment functionality

How to Fix B1B98 Lincoln

  1. Perform a visual inspection of the seat control switch and its wiring for any signs of damage or wear.
  2. Test the seat control switch for proper functionality using a multimeter to check for continuity and resistance.
  3. Inspect the seat motor for any signs of malfunction or binding that may prevent it from operating correctly.
  4. If necessary, replace the faulty seat control switch or repair any damaged wiring in the harness.
  5. Reprogram or replace the Driver Front Seat Module (DSM) if it is determined to be defective after testing.

Cost to Fix B1B98 Lincoln

The cost to diagnose and repair the B1B98 code typically ranges from $150 to $500, depending on the specific issue and parts needed. Replacement parts such as a seat control switch or seat motor can cost between $50 and $200, while labor rates vary significantly based on location and shop type, generally ranging from $80 to $150 per hour. Dealerships may charge higher rates, while independent shops may offer more competitive pricing. It is advisable to obtain a detailed estimate from a trusted technician for accurate costs related to your specific vehicle make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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