Tip & How-To about Jeep Grand Cherokee

Jeeps - All Windows and/or Locks don' work.

It is widely known that Jeeps have a problem with the Driver's Side Windows/Locks Control Module wiring harness that prevents all window motors and/or Power Locks from working. This may be due to the way the harness was laid out.

Over time, the wires feeding this circuits, brake or came loose from the harness connector on the drivers door.

The solution is to remove the rubber boot at the door, unplug the harness from the door and repair the broken, disconnected wires. Check all wires carefully, sometimes you can't tell they are broken because it's insulation, pay special attention to the BLACK wire, it provides the (-) ground to the whole circuit.

This simple procedure will relieve you from the great head ache that is not to be able to roll up or down your door windows.and/or power locks.

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2 Answers

What could be wrong with the power window switches


Do all the windows work from this switch? Could be the switch not sending power to the others. But, All Jeeps are bad for window regulators.

Apr 04, 2016 | 1999 Jeep Grand Cherokee

1 Answer

Which Relay/Fuse controls the power windows?


Did you check for battery voltage at the switch , with a volt meter before you replaced the main driver door switch ? Maybe you'll want to take this to pro ,instead of just replacing parts !
Symptom Chart Condition Possible Sources Action
  • No communication with the smart junction box (SJB)
  • Circuitry
  • SJB
  • REFER to Section 419-10 .
  • A single power window is inoperative - driver front power window is inoperative/does not operate correctly
  • Power window motor regulator and motor
  • Circuitry
  • Window control switch
  • Smart junction box (SJB)
  • Go To Pinpoint Test A .
  • A single power window is inoperative - passenger front, left rear or right rear
  • Power window motor regulator and motor
  • Circuitry
  • Window control switch
  • Go To Pinpoint Test B .
  • All power windows are inoperative
  • Smart junction box (SJB) fuse 30 (10A)
  • SJB circuit breaker 10 (30A)
  • Circuitry
  • Delayed accessory relay
  • Battery saver relay
  • Driver window control switch
  • SJB
  • Go To
PINPOINT TEST C: ALL POWER WINDOWS ARE INOPERATIVE Test Step Result / Action to Take C1 CHECK FOR CORRECT OPERATION OF THE INTERIOR LIGHTS
  • Turn on the interior lights.
  • Do the interior lights operate normally?
Yes
GO to C2 .

No
To continue diagnosis, REFER to Section 417-02 . C2 CHECK CIRCUIT 400 (LB/BK) FOR VOLTAGE TO THE DRIVER WINDOW CONTROL SWITCH
  • Disconnect: Driver Window Control Switch C504b.
  • Key in ON position.
  • Measure the voltage between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and ground.
    >
  • Is the voltage greater than 10 volts?
Yes
GO to C4 .

No
GO to C3 . C3 CHECK CIRCUIT 400 (LB/BK) FOR AN OPEN OR SHORT TO GROUND
  • Key in OFF position.
  • Disconnect: SJB C2280c.
  • Measure the resistance between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and the SJB C2280c pin 17, circuit 400 (LB/BK), harness side; and between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and ground.
    >
  • Is the resistance less than 5 ohms between the driver window control switch and the SJB; and greater than 10,000 ohms between the driver window control switch and ground?
Yes
Go To Pinpoint Test H

No
REPAIR the circuit. TEST the system for normal operation.

Mar 24, 2015 | 2004 Mercury Sable

1 Answer

Driver Side window will not come back up


be careful with jeeps they have a body control module that controls the windows , locks ect they go out often a dealer with scanner can check. also you have the window switch on the drivers door , rarely is it the regulator on a jeep

Jun 05, 2009 | 1999 Jeep Grand Cherokee

1 Answer

power door locks and windows


The answer to your question is maybe. Get a couple of switches from a junkyard (my guy gets $5.00 each) and try them. Here's why: I have no less than five different wiring diagrams, and none of them make any sense at all (been doing this stuff a really long time) I keep a good switch handy to check my jeeps when one gets wierd on me...even so, my 93 passenger window works with the key off, none of the others do. Stopped trying to figure it out a long time ago, but would really like to meet the guy who designed this stuff!

Feb 22, 2009 | 2000 Jeep Grand Cherokee

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