1998 Oldsmobile RegencyFACTORY OEM SERVICE PROCEDURE

Left Seat Does Not Manually Move In One Direction

NOTE: After repair or component replacement is completed, perform MEMORY SYSTEM CHECK  under TROUBLE SHOOTING to verify system is functioning properly.
  1. Perform MEMORY SYSTEM CHECK  under TROUBLE SHOOTING. Go to next step.
  2. Turn ignition off. Ground memory seat diagnostic connector. Memory seat/mirror module will chime once to indicate Mode 1 has been entered. Operate driver's seat switch in all directions. Memory seat/mirror module should chime once at each switch input. If any switch input does not cause a chime to sound, go to next step. If all switch inputs cause a chime to sound, go to step 4).
  3. Remove ground from memory seat diagnostic connector. After 5 seconds, 3 chimes will sound to indicate that diagnostic mode has been exited. Disconnect memory seat/mirror module. With suspect switch pressed, use DVOM to check voltage between ground and appropriate memory seat/mirror module harness connector terminal. See IDENTIFYING LEFT SEAT SWITCH CIRCUITS  table. If 10-15 volts exists, go to next step. If 10-15 volts does not exist, go to step 6).
  4. Check for open or short to ground in appropriate wire between inoperative seat motor and memory seat/mirror module. See WIRING DIAGRAMS  . If circuit is okay, go to next step. If circuit is not okay, go to step 9).
  5. Replace suspect motor. See SEATS - POWER article.
  6. Check for an open circuit in appropriate wire between left seat switch and memory seat/mirror module 32-pin connector C2 (Blue). See IDENTIFYING LEFT SEAT SWITCH CIRCUITS  table. If circuit is okay, go to next step. If circuit is not okay, go to step 9).
    IDENTIFYING LEFT SEAT SWITCH CIRCUITS

    Application Wire Color
    Entire Seat Back Light Green
    Entire Seat Forward Tan
    Front Height Up Dark Green
    Front Height Down Dark Blue
    Rear Height Up Yellow
    Rear Height Down Light Blue
    Recline Up Light Green
    Recline Down Light Blue
  7. Replace left seat switch.
  8. Replace memory seat/memory mirror module.
  9. Repair open or short to ground in appropriate wire. See WIRING DIAGRAMS  .
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.