Question about 2002 GMC Envoy

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Ona 2002 gmc envoy the rear wiper does not work..I took the trim off and I am getting current to the module on the wiper motor. I disconnected the connector from a white module that is attached to the

I haven't tried anything yet, other than taking the trim off and testing for current to the modual on the wiper motor

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2 Answers

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  • GMC Master
  • 12,132 Answers

You can not just simply check for power at the module on the wiper motor The rear wiper motor control circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the ( LGM) lift gate module . you need a lab scope to check (PWM) and a scan tool . listen to some of this other guy's and you'll be shorting something out !

Posted on Jan 11, 2015

  • Jeff Armer Jan 11, 2015

    The rear window wiper/washer switch is an input to the BCM. The requested rear wiper mode is sent to the liftgate control module (LGM) by the BCM as a message on the serial data circuit, and the rear window wiper motor is controlled by the LGM. The switch power circuit to the rear wiper/washer switch is a 12-volt reference supplied by the BCM during ignition on, accessory or RAP power modes. The rear wiper/washer switch is a series of resistors and the switch position is determined by the voltage of the rear wiper/washer switch signal circuit to the BCM. The rear wiper/washer switch has continuity at all times and the BCM expects a rear wiper/washer switch signal voltage in all switch positions including OFF. The rear wiper motor is supplied battery positive voltage and ground. The LGM controls rear wiper motor operation through the rear wiper motor control circuit. The rear wiper motor control circuit is supplied a battery positive reference voltage by the rear wiper motor module and is pulse width modulated to ground by the LGM. The duty cycle of the pulse width modulation determines the rear wiper motor operating mode. The liftglass and liftgate ajar switches are inputs to the LGM and must be in an inactive state in order for rear wiper washer system operation to be enabled. When an ajar switch is active the LGM suspends wiper motor operation directly and sends the ajar switch status messages over the serial data circuit enabling the BCM to suspend washer pump operation. The rear window washer pump is controlled by the BCM through the rear washer relay. Battery positive voltage is supplied to the coil and switch sides of the rear washer relay. When the rear window wash request is active the BCM energizes the relay by grounding the relay coil through the rear washer relay control circuit. When the relay is energized battery positive voltage to the relay switch is supplied to the washer pump control circuit.

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  • GMC Expert
  • 211 Answers

Put power to the motor and see if it hums. Have somebody sit inside and turn key and turn power on to the switch on rear wiper And see if it turns or on the car battery. Power and negative, lets find out if it is the motor or not.

Posted on Jan 11, 2015

  • 3 more comments 
  • Joe Colella
    Joe Colella Jan 11, 2015

    many thanks..will try this when the weather get's a little warmer..

  • Jeff Armer Jan 11, 2015

    you don't know what your talking about , this is a pulse width modulated ground at the lift gate control module!

  • Antonio Delgado
    Antonio Delgado Jan 12, 2015

    The fuse is different depends on the body options.In the fuse box under the back seat, One is body style, the wiper is fused under the LGM #2 Fuse 3 and on the other body style there is a circuit breaker 9 labeled RR WIPER. You would have to pull the panel off the back to check for power and ground to the wiper motor. I can tell you what wires to check for back there if you want to do the tests. I do see a lot of the wire melt in the connections to the rear hatch. If you open the rear hatch and find the boot that has the wires going through it that runs up in the head liner area. If you pull that boot loose from the body side and pill the wire back until you find the connector and unplug the connector and look for any wires melted in and around the connector. look for spread terminals also in that connector Read more:http://www.justanswer.com/gmc/4jds3-gmc-...

  • Antonio Delgado
    Antonio Delgado Jan 12, 2015

    Sending you more info evey little bit helps, good luck

  • Antonio Delgado
    Antonio Delgado Jan 12, 2015

    In case it is the motor check this out, ---https://www.youtube.com/watch?v=iDz5uT4T...

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REMOVAL
- Disconnect and isolate the battery negative cable.
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- Using a small thin-bladed tool, gently pry at the notch in the base of the rear wiper motor output shaft bezel to unsnap the nut cover from the bezel (REAR WIPER MOTOR OUTPUT SHAFT NUT REMOVE/INSTALL). Be certain to take proper precautions to protect the outer tailgate panel and its paint finish from damage during this procedure.
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1 - BEZEL AND GASKET
2 - OUTPUT SHAFT
3 - TAILGATE OUTER PANEL
4 - NUT
5 - NUT COVER

What you will need to do is to remove the small plastic cap on the wiper arm by prying it off with a screw driver. Then remove the nut that holds the arm onto the shaft. Then get yourself a battery cable puller (from auto parts store) and pull the arm off of the shaft..

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1 - SPARE TIRE
2 - WRENCH
3 - FLIP-UP GLASS
4 - PARK RAMP
5 - REAR WIPER ARM
6 - PIVOT COVER

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I need to know how to remove the pannel cover on the rear hatch door I can get to the rear wipper motor


449b69b.jpg

Exploded view of the Explorer/Mountaineer rear liftgate trim panel (click for zoom)



Rear Window Wiper Motor


b5927f1.jpg

Fig. : Rear wiper motor assembly and related components

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