1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4FACTORY OEM SERVICE PROCEDURE

All Power Seat Functions Inoperative

  1. Perform POWER SEATS SYSTEM CHECK  under TROUBLE SHOOTING. Go to next step.
  2. Disconnect power seat switch connector. Connect test light between power seat switch harness connector terminal "F" (Orange/Black wire) and ground. If test light comes on, go to next step. If test light does not come on, repair open in Orange/Black wire or Orange wire between power seat switch and instrument panel fuse block.
  3. Connect test light between power seat switch harness connector terminals "F" (Orange/Black wire) and "C" (Black wire). If test light does not come on, repair open in Black wire between power seat switch and ground. If test light comes on, check for poor connections at power seat switch. If connections are okay, replace power seat switch. See POWER SEAT SWITCH  under REMOVAL & INSTALLATION.
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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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