1991 Cadillac Seville BaseFACTORY OEM SERVICE PROCEDURE

Master Control Switch (SEVILLE)

Check for power at terminal "F" (Pink wire). All other switch terminals should have continuity to terminal "E"(Black wire) when all switches are in rest position. Operate switches and check continuity. See MASTER CONTROL SWITCH CONTINUITY (SEVILLE)Β  table. If continuity does not exist as specified, replace master control switch.

MASTER CONTROL SWITCH CONTINUITY (SEVILLE)

Switch Position (1) Terminals
Left Front
UP F & H
DOWN F & G
Right Front
UP F & K
DOWN F & J
Left Rear
Up F & B
Down F & A
Right Rear
UP F & D
DOWN F & C
(1) For terminal identification, see WIRING DIAGRAMSΒ  . Measure continuity between terminals listed.
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.