Wipers - Chevy and GMC Duramax Diesel Forum
2007.5 + (GMT 900) Non Powertrain--New Body Style-- Discussion 07.5 - 2010 Topics Not related to the Powertrain, interior, suspensions, body, wheels, tires, ect.

 
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post #1 of 4 (permalink) Old 04-18-2019, 04:23 PM Thread Starter
DuramaxForum n00b
 
Join Date: Aug 2007
Location: Michigan
Posts: 10
Wipers

My just have just started to behave strangely. Intermittent and high speed settings work fine. When I turn them on regular speed constant, they'll wipe for 3-4 strokes, then stop. The wipe for 6-7 stroke then stop. This continues to repeat with no consistency. They may work for 5 minutes, then stop. I've looked it up on the internet and it seems there are several modules. One of them I believe they said was soldered into the fuse box. Looking for any suggestions.


2009 Silverado 2500HD Duramax/Allison Crew Cab Long Box


1959 Chevy Apache Napco 4x4 stepside
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post #2 of 4 (permalink) Old 04-18-2019, 08:35 PM
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Windshield Wipers

The windshield wiper/washer switch signal circuits are inputs to the body control module (BCM) and the BCM controls wiper motor low speed operation, washer pump and high speed operation. The windshield wiper/washer switch is provided a low reference from the BCM and each of the switch signal circuits is supplied 12 volts through a resistor and monitored within the BCM. During LOW or INTERMITTENT operation the wiper switch low signal circuit is closed to the low reference circuit through a series of resistors within the switch assembly and the signal circuit voltage monitored by the BCM will depend on the switch contact location to the resistor assembly. During HIGH or WASH operation the high and wash switch signal circuits are closed directly to the low reference circuit within the switch assembly and nearly all the signal circuit voltage will be dropped across the BCM resistors. The BCM controls the wiper motor through the WIPER 1 relay and the WIPER 2 relay. During any wiper motor function that uses low speed the BCM supplies the voltage to energize the WIPER 1 relay and battery voltage will be supplied from the WIPER 1 relay through the de-energized WIPER 2 relay to the wiper motor low speed control circuit. During high speed wiper motor operation the WIPER 1 relay is energized as in low speed and the BCM provides a ground to energize the WIPER 2 relay and the battery voltage is supplied to the wiper motor high speed control circuit. Wiper motor park operation is controlled by the BCM using an input from the park switch within the wiper motor assembly. The BCM supplies the park switch signal circuit 12 volts through a resistor then monitors the circuit. Whenever the wiper motor is out of the park position the park switch signal circuit is closed to ground and nearly all the signal circuit voltage will be dropped across the BCM resistor. When the wiper switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the BCM will continue to operate the motor until the wipers reach the park position. If the ignition is turned OFF while the wipers are in mid-cycle, the wipers will stop immediately where they are and the BCM will park the wipers the next time the ignition is cycled ON.

Moisture Sensitive Wipers

The outside moisture sensor monitors moisture accumulation on the windshield and uses a windshield wiper/washer switch status input to provide wipe commands to the body control module (BCM). The DELAY positions on the wiper/washer switch are used to activate the AUTOMATIC rain sensing operating mode. They are also used to adjust the level of sensitivity to moisture accumulation, which determines the dwell time for commanding a wiper motor wipe cycle.

Accessory voltage is supplied to the outside moisture sensor from the BCM. The sensor is grounded through the ground circuit and G200. Whenever the ignition is in the run or accessory positions, the BCM sends the wiper/washer switch status using a pulse width modulation (PWM) signal through the outside moisture sensor signal 1 circuit to the outside moisture sensor. When a wipe cycle is needed, the moisture sensor sends a PWM voltage signal through the moisture sensor signal 2 circuit back to the BCM requesting the wiper operation.

The outside moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the outside moisture sensor and BCM is lost, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.

Ron Nielson
2008 Silverado LT, CCLB, Edge Insight CTS
2009 Arctic Fox 29-5T, Silver Fox Edition, Onan 3600 LPG generator
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post #3 of 4 (permalink) Old 04-19-2019, 06:32 AM Thread Starter
DuramaxForum n00b
 
Join Date: Aug 2007
Location: Michigan
Posts: 10
I get that - how to do I fix it???


2009 Silverado 2500HD Duramax/Allison Crew Cab Long Box


1959 Chevy Apache Napco 4x4 stepside
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post #4 of 4 (permalink) Old 04-19-2019, 06:51 AM
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Join Date: May 2018
Posts: 502
Hopefully, just change switch.
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