Question about 1997 Jeep Grand Cherokee

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Rear wiper does not work

Put in a new wiper motor has power going back to the motor and at the switch

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Check ground wire on wiring harness to wiper motor. If ground is good you need a wiper switch. Good
luck

Posted on Dec 16, 2008

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2002 trialblazer rear window wiper inop. changed switch and motor. no power to motor. cannot find relay nor fuse


There are something's involved that you are not aware of , or familiar with . Electronic control modules .
Rear Wiper/Washer System Controls
• Body control module (BCM)
• Liftgate control module (LGM)
• Rear wiper/washer switch
Do you know what a serial data network is ?
Rear Wiper/Washer System Operation
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.

Your best bet , take it to a qualified repair shop and have it checked for DTC'S - diagnostic trouble codes .
DTC B1017 or B3970
The rear wiper motor is supplied battery positive voltage and ground. The liftgate control module 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 liftgate control module. The duty cycle of the pulse width modulation determines the rear wiper motor operating mode.
DTC B3799

2
Turn the ignition ON.
Operate the rear wiper switch through all the switch positions.
Does the rear window wiper operate normally?
--
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Install a scan tool.
Display the liftgate control module data list.
Observe the following parameters while operating the respective switches. Refer to Scan Tool Data List for typical values.
• Liftgate Ajar Switch
• Liftglass Ajar Switch
Did the scan tool indicate the correct switch positions?
--
Go to Step 4
Go to Courtesy Lamps Inoperative in Lighting Systems
4
Observe the requested rear wiper parameter in LGM data list.
Operate the rear wiper switch through all the switch positions.
Does the scan tool indicate the correct requested rear wiper parameter in relation to the switch position?
--
Go to Step 5
Go to Step 6

Feb 06, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

Subaru wiper


guessing sucks, no? very expensive..!!! what year CAR?
ever heard of a $20 DMM that all have a voltmeter?
yes, use a volt meter.
if you had , you would have found that there was no
power to the motor, when activated.
the motors on all wipers are self sustaning of zero point.
that means that it self powers up inside with its one power switch.
so some need power on 2 pins, RTM read the FSM its there .
ever wonder why wipers keep going when turn off, that is it returns for FREE. bingo on self power I(no this is not free energy , lol)

there are only 2 pissible.
1: no power.
2:its jammed, same is true for all Elect motors, be it wiper , windows, fans, sure anything.

rear windows are pretty much not jammable but ive
never look inside the rear rear door of the not stated year, Subaru.
but if you look and see arms in there, bingo. they are jammed
one way to do this , done many a time.
is to release just the motor arm and then cycle the mechanism
by hand, oops , jammed.

no power, or jammed.

Oct 10, 2013 | Cars & Trucks

1 Answer

Rear wiper doesn't work


check rear wiper fuse and relay.if wiper motor getting power but do not work.rear wiper motor bad.if fuse and relay okay but no power going to rear wiper rear wiper switch could be bad.

May 14, 2013 | 2000 Seat Ibiza

2 Answers

Back windshield wiper won't turn on


The rear wiper has a dedicated fuse. It's the 10A R/WIPER fuse in the relay block. This supplies power to the rear wiper and washer switch and the rear wiper control unit. That unit also gets power from the 20A AUDIO (!) fuse in the engine room fuse box. If the fuses are OK, the ignition switch is in the ON position, and the rear wiper and washer switch is turned on the rear wiper should work. If not check all the components described to find where the loss of power is occurring

Nov 15, 2012 | 2005 Kia Sorento

1 Answer

My rear wiper blade is not working


check rear wiper window circuit breaker.if it looks okay.make sure power is going to wiper motor.if yes wiper motor is bad.if no power going to wiper motor.check for power at switch if yes check for a broken wire at switch or switch is faulty.

Dec 08, 2009 | 2004 Hyundai Santa Fe

2 Answers

I have a 2003 GMC yukon, the rear wiper does not work,the fuses are good, what should I look at?


JUST PUT A NEW GROUND WIRE TO THE REAR WIPER MOTOR............SIMPLE GOOD LUCK

Dec 07, 2009 | 2003 GMC Yukon

2 Answers

Rear wiper does not work at all. front wipers work fine. rear washer works


1. check the fuse to the rear wiper motor
2. check for power to rear wiper motor at the motor (power wire going in to the wiper motor with rear wiper switch on)
If you have good fuses & have power going in to the rear wiper motor...
3. Pull old rear wiper motor and install a new rear wiper motor.
Thank you please drive thru......

Feb 26, 2009 | 2001 Ford Expedition

1 Answer

Rear wiper


It,s a good possibility that the motor is bad, but first do this, turn on the rear wiper switch and go to the rear wiper motor and with a screwdriver handle tap on the motor body and see if it moves. Sometimes the brushes in the motor get stuck and tap on the motor body will loosen them up, also make sure you have power going to it.

Feb 14, 2009 | 1992 Jeep Wrangler

2 Answers

I have a1992 ford explorer the front and rear wipers quit workin


check for power at the wiper motor. If power at the wiper motor but no wiper action then replace the motor. if no power at the motor then use a jumper wire and put power to the motor. Does motor run? if so check for open circuit in the wire someplace.

Dec 27, 2008 | 1992 Ford Explorer

1 Answer

99 Nissan Quest real wiper runs continually when ignition is on


Principles of Operation
Operation of the windshield wiper and washer is controlled by the front wiper/washer amplifier assembly. The front wiper/washer amplifier input comes from the multifunction switch by means of a voltage divider circuit. A constant voltage is applied to the multifunction switch by the front wiper/washer amplifier. When the multifunction switch is moved into the LO, HI, or intermittent position, the voltage is directed through a series of resistors. This results in various voltages being returned to the module for each switch position. The module then grounds the appropriate circuit, based on the voltage signal received back from the multifunction switch. This causes the wipers to run intermittently, or at the appropriate speed. Voltage is supplied to the wiper motor by the CJB fuse F46 (20A).
When the multifunction switch wash button is depressed, it bypasses all of the resistors returning a full voltage signal to the module. The module then grounds the appropriate circuits to operate the windshield washer pump for as long as the switch is depressed. The windshield wiper speed is dependent on the position of the windshield wiper/washer switch.
Voltage for the windshield washer pump is also provided by CJB fuse F46 (20A).
Operation of the rear wiper and washer is controlled by the rear wiper/washer switch.
Voltage is supplied to the rear window wiper motor by the fuse junction panel fuse F44 (10A).
The rear window wiper motor ground is made or broken by the rear wiper/washer switch. When the rear wiper/washer switch is moved into the WIPER position, it grounds the rear window wiper motor circuit, causing the rear window wiper motor to run once every 10-15 seconds.
Voltage to the rear washer pump motor is also supplied by the CJB fuse F44 (10A). The rear washer pump is directly controlled by the rear wiper/washer switch which makes or breaks the ground for the washer pump motor, depending upon its position.
If the vehicle is equipped with a movable liftgate glass, a liftgate glass switch is utilized to prevent rear window wiper operation when the liftgate glass is open. This same switch also causes the rear window wiper to drop down approximately three inches when the liftgate glass latch is released.
------------------------------------------------------------------------------------------
  • The wipers stay on continuously — rear wiper
  • Circuit.
  • Rear wiper/washer switch.
  • GO to Pinpoint Test L .


---------------------------------------------------------------------------------------------
Measure the resistance between rear wiper/washer switch C288 pin 6, component side and rear wiper/washer switch C288 pin 2, component side.
  • Is the resistance less than 5 ohms with the switch depressed, and greater than 10,000 ohms with it released?
sxv~us~en~file=arrow.gif~gen~ref.gifYes GO to L2 .
sxv~us~en~file=arrow.gif~gen~ref.gifNo INSTALL a new rear wiper/washer switch. TEST the system for normal operation.

Measure the resistance between rear wiper/washer switch C288 pin 6, circuit WB08 (BU/YE), harness side and ground.
  • Is the resistance greater than 10,000 ohms?
sxv~us~en~file=arrow.gif~gen~ref.gifYes INSTALL a new rear wiper /washer switch. TEST the system for normal operation.
sxv~us~en~file=arrow.gif~gen~ref.gifNo REPAIR circuit WB08 (BU/YE). TEST the system for normal operation.

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Dec 08, 2008 | 1999 Nissan Quest

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