1998 Cadillac DeVille BaseFACTORY OEM SERVICE PROCEDURE

Both Mirrors Do Not Move Manually

NOTE: After repair or component replacement is completed, perform MEMORY SYSTEM CHECKΒ  under TESTING - SYSTEM CHECKS to verify system is operating properly.
  1. Performed MEMORY SYSTEM CHECKΒ  under TESTING - SYSTEM CHECKS. Go to next step.
  2. Using test light, backprobe between outside mirror switch connector terminal "E" (Orange wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
  3. Using test light, backprobe between outside mirror switch connector terminals "E" (Orange wire) and "D" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
  4. If both mirrors operate in all directions during memory recall functions, go to next step. If both mirrors do not operate in all directions during memory recall functions, go to step 6).
  5. Replace outside mirror switch. See MIRRORS - POWER article.
  6. Replace Memory Mirror Module (MMM).
  7. Repair open in circuit No. 1740 (Orange wire) between outside mirror switch and splice S505. See WIRING DIAGRAMSΒ  .
  8. Repair open in circuit No. 50 (Black wire) between outside mirror switch and splice S200. See WIRING DIAGRAMSΒ  .
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:

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