Question about 1999 GMC Jimmy

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I have a 1999 Jimmy and the rear wiper does not operate well.

Wiper gets stuck and does not sweep as intended, the motor makes funny noise. Do i have to replace the rear wiper? or the motor as well? How do I replace the entire thing. Thanks for the help

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It's a one hour repair, not too difficult. These things get locked up by turbulent water/salt spray behind the vehicle leaking internally into the gears, corroding and binding them up. AFter two replacements, gave up. Wipers can't really keep up with the spray seems anyway. Daughter helped out, rolled and totaled it (unhurt) after I pretty much had the thing running great. You can buy the wiper motor on Ebay, but make sure they vow that it works, most all the salvage have the same problem. Make sure they will stand behind it.

Posted on Jan 23, 2009

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Wipers will not move, makes noise and there is power to the motor. Motor was replaced. Someone told me that the arms probably moved to far and are now stuck, how do I fix this?


Windshield Wiper Blade & Arm Removal & Installation Front To Remove:
  1. Mark the location of the wiper on the windshield.
  2. Remove or disconnect the following:
    • Nut cover
    • Nut from the wiper arm
    • Wiper arm
Wiper arm mounting nut gm_truck_s10_w-wpr-arm_ret-nt.gif
To Install:
  1. Install or connect the following:
    • Secure the wiper arm with the nut.
      1. Tighten to: 17 ft-lb (23 Nm)
    • Nut cover
Rear To Remove:
  1. Put the wiper arm in the park position.
  2. Remove or disconnect the following:
    • The washer hose from the connector
    • The cap from the wiper arm
    • The nut from the wiper arm
    • The wiper arm from the wiper motor shaft
Rear wiper arm mounting nut gm_truck_s10_w-wpr-arm_ret-nt_rr.gif
To Install:
  1. Install or connect the following:
    • The wiper arm on the wiper motor shaft in the park position with the wiper arm resting on the park ramp
    • The nut on the wiper arm
      1. Tighten the nut. Torque to: 17 ft lbs (23 nm)
    • The cap on the wiper arm
    • The washer hose on the connector

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The wiper motor hopefully is ok, but if the wiper arms were not mounted at the right spot, it could have damaged the motor as it returned to the rest position, unfortunately.

If there is noise, the noise could be coming from the wiper arm joint being stripped out or the motor itself assuming that the ball joints under the hood and behind the firewall are still connected.

Check these items, and I'm sure you will get to the bottom of this.

Good luck on this repair.

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The rear wiper on my '99 model exped isnt working ,ford global says its the motor and it will cost me P13k . any one who can help me find a mechanic do some repair on this?


what is P13K?

check the fuse first. dealer can hook up NGS Tester and get fault codes to see what is wrong.

Principles of Operation
NOTE: The generic electronic module (GEM) will not activate the rear wiper system if either the liftgate or the liftgate glass is ajar. If either the liftgate or the liftgate glass becomes ajar while the rear wiper is in operation, the GEM will park the rear wiper motor.
There are two distinct modes of wiper operation:
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  • Interval Mode: This mode is selected when the rear wiper switch is in either the Interval 1 or 2 position. When this mode is selected, the rear wiper motor is driven up onto the glass by activating the rear wiper UP relay. When the wiper motor HIGH/LOW/PARK position input reaches the high position, the UP relay is deactivated and the DOWN relay is activated to reverse the wiper motor direction. When the wiper motor reaches the LOW position, as determined by the HIGH/LOW/PARK position input, the GEM deactivates the DOWN relay and will begin a new wiper cycle 1 to 10 seconds later, depending on the interval position selected.
To engage the rear window washer, rotate the rear window washer selector downward to the WASH position. The rear window wiper will run as long as the WASH position is selected. When the rear window washer selector returns to the OFF, INT 1 or INT 2 position, the washer will stop immediately, but the rear window wiper will continue for two to three sweeps and then return to its previous mode of operation.
The low washer fluid indicator chime warns that the washer fluid level is low. The low washer fluid indicator chime is a single tone with a duration of one second. The chime will sound when the low washer fluid indicator is initially activated.
The low washer fluid indicator warns that the fluid level in the washer reservoir is low. The low washer fluid indicator will illuminate when the washer fluid level is low and the ignition switch is in the RUN position.
The low washer fluid indicator will deactivate when the washer fluid reservoir is filled and the ignition switch has been cycled from RUN to OFF, then to RUN.
Inspection and Verification
  1. The wiper/washer system is a generic electronic module (GEM) controlled system; refer to Section 419-10 .
  1. Verify the customer concern by operating the wiper/washer system.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Hoses to windshield washer pump
  • Wiper linkage
  • Fuses 6 (5A), 8 (5A), 15 (5A), and 20 (5A)
  • Wiring harness
  • Loose or corroded connector(s)
  • Relays
  • Motors
  • Multifunction switch
  • Washer fluid level switch


----------------------------------------
  • The wipers are inoperative — rear
  • Fuses 6 (5A), 8 (5A), 15 (5A), and 20 (5A).
  • Circuitry.
  • GEM.
  • Multifunction switch (wiper/washer switch).
  • Rear wiper up relay.
  • Rear wiper down relay.
  • Rear wiper motor.

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