2008 Mercury Sable Base, FWDFACTORY OEM SERVICE PROCEDURE

Brake System DTCS

DRIVER SEAT MODULE (DSM) DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description Source Perform Test
B1987 Pedal Forward/Rearward Motor Stalled Driver Seat Module (DSM) Go to Pinpoint Test C .
B1988 Pedal Position Forward Switch Circuit Short to Battery DSM Go to Pinpoint Test B .
B1989 Pedal Position Rearward Switch Circuit Short to Battery DSM Go to Pinpoint Test B .
B1991 Pedal Forward/Rearward Potentiometer Feedback Circuit Short to Battery DSM Go to Pinpoint Test C .
B2275 Pedal Forward/Rearward Potentiometer Feedback Circuit Short to Ground DSM Go to Pinpoint Test C .
- All Other DSM DTCs DSM REFER to the Driver Seat Module (DSM) DTC Table in SEATING article.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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