Question about 1996 Chevrolet Tahoe

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Wiper motor buzzes and wont work Is it the pulse module or the wiper motor itself

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Check the ground wire on the early 90s model did that they was losing ground try running a extra ground wire to the wiper motor

Posted on Oct 02, 2009


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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

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
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
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

1984 buick lesaber wipers stoped pulsing

Usually when the delay function fails, the problem is in the circuit board module on the wiper motor.
You would need to check the circuit with a meter, the module may be available without buying a wiper motor.

Feb 08, 2013 | 1984 Buick LeSabre

1 Answer

Windshield wiper wont stop going the delayed wiper settings dont work

you should of included what kind of car but ur problems are the wiper switch and pulse modulator on the wiper motor

Jul 14, 2011 | Chevrolet Silverado 1500HD Cars & Trucks

1 Answer

Delay wipers only work on high speed on 2000 chevy silverdo 1500 truck no delay

Hello, my name is Ben and I can help you with this problem. This is a very common problem with Chevy. You need what is known in most vehicles as a "pulse board". The pulse board is located inside the wiper motor control module. On many vehicles the pulse board is replaceable, unfortunately on your Silverado you must replace the entire Wiper Motor Control Module which is bolted onto the top of the wiper motor. To get to the wiper motor, first remove those little nut covers on the big end of the windshield wiper arms, if you slip a small screwdriver or your fingernail they just pop off. Now unbolt the windsheild wiper arms, before removing the wiper arms, mark their location on the windsheild with a grease pencil or magic marker. The arms are hard to remove, you need to kinda wiggle and pull at the same time, now that long plastic cowl needs to come off, those clips at the front edge just slide forward, then at each end lift up that rubber flap and remove those TORX screws. Remove the cowl and set it somewhere SAFE, it's easy to break. You will now see the control module mounted on the wiper motor, unplug the electrical connections and remove the TORX screws holding it to the motor. Assembly is the reverse of dis-assembly. If you have any trouble or questions, feel free to ask, Ben.

Nov 13, 2010 | 2000 Chevrolet Silverado

1 Answer

My wipers are working only some of the time, motor runs.. wipers don"t

ok here ya hood along the back cowl locate the wiper motor,there is a bolt that holds the square plastic piece called the wiper pulse module its a easy fix and you almost...cant mess it up. you can also turn the wipers on and when they arent working smack the pulse module with your hand.they will propably come on and thus confirming it is worn and bad.tahe it off you will see how it works.hope this helped let me know have a good day Darrell

May 08, 2010 | 1997 GMC Jimmy

2 Answers

Wipers only work on high speed. washer pump work too. I have no low speed or delay for wipers. Is this a switch problem or is there a relay modual under the hood that could be bad

Hello, this is a very common problem for Chevrolet. Your wiper motor control module is bad. It's mounted directly onto the wiper motor. On some models you can replace the "pulse board" inside the control module. If not you need to replace the entire wiper motor control module. It depends on your level of skill and parts availability.

Feb 02, 2010 | 1999 Chevrolet Express

1 Answer

Replaced wiper motor but still won't work buzzes

can you move the linkage when you pulled the motor?

Aug 30, 2009 | 1995 Chevrolet C1500

2 Answers

Windshield wipers stay up on the windshield, wont go back down when i shut them off

There is a wiper pulse board on the wiper motor itself that is failing, this can be replaced without replacing the entire unit.

Jun 28, 2009 | 2001 Chevrolet Venture

10 Answers

Windshield wipers will not turn off - 2003 Chevrolet Silverado

Fixed the wiper problem which was identical to Brad's by changing out the wiper module which is also called a pulse module or something of that nature. Pretty easy fix. You have to remove the grill that the wiper blades protrudes from in order to get to the motor (4 clips in front which can be removed by hand, remove radio antenna, a center push down retainer, two plastic end caps which pop off and then 1 star type screw on each end under the end caps). Getting the blades off seemed difficult. I used a small puller to pop them off after removing the nuts.

You can't buy this module at a regular parts store. I had to get it from the dealer so be prepared to spend $130 to $140 for the part or go to the salvage yard. Works great now.

Mar 14, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

1988 Chev c1500 wiper motor pulse board

well if you replace the whole wiper motor and get the lifetime warranty you wont have to worry about it anymore because if it goes out again you just get another motor sure its a little more hard work then a pulse module but you don't have to worry that the motor will go out. just a recommendation.

Jun 13, 2008 | 1988 Chevrolet K1500

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