1990 Jeep WagoneerFACTORY OEM SERVICE PROCEDURE

Power Windows: Testing

TESTING POWER WINDOW

Test OK Not OK
No Windows Operate - Power window circuit breaker installed
Probe terminal S on fuse panel Battery voltage Replace circuit breaker
Side of cigar lighter socket to ground Zero ohms Repair open to ground
Remove master door lock/power window switch assembly mounting screws & probe terminal BY at left switch Battery voltage Repair open to circuit breaker
Probe BLK wire (terminal DX) at left switch Zero ohms Repair open to ground splice of IP harness
Operate window switch Windows move & down Go to Switch Testing
Master power window switch Passes test Replace defective motors
One Window Operates - Remove door panel of inoperative window, and probe harness side of unplugged motor connector.
Terminal A of connector, holding switch in DOWN position Battery voltage Repair open back to master switch if additional switch is in circuit (not left motor), refer to Switch Testing
Terminal B of connector, holding switch in DOWN position Zero ohms, Caution, maintain DOWN position while meter lead is attached Repair open back to master switch if additional switch in circuit (not left motor), refer to Switch Testing. If both tests are OK, replace motor.
Fig 1: Cherokee & Wagoneer Power Window Wiring Schematic (2-Door)
G117228Courtesy of CHRYSLER MOTORS.
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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.