Question about 2006 BMW 750Li

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Intermittent wiper function does not work. When the wiper control is in intermittent position, wipers will work at uniterform speed. But, intermittentency will not work. One reputable bmw dealer's mechanic tried to fix this problem through trial and error by switching increasingly expensive control modules. After two attempts, none worked. I need knowledeable information on this problem before trying another dealer or mechanic.

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Has the wiper switch been changed out? because in my 35 years of experience 90% of the time the wiper switch is defective and the cause of the problem, the symptoms u have reinforce my opinion this is the problem.

Posted on Oct 11, 2010

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Posted on Jan 02, 2017

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I have a 2009 gmc sierra, where is the wiper relay location.


The PCB wiper relays are soldered directly to circuit board inside the under hood fuse box.
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 CONTROL PCB Relay and the WIPER SPEED PCB Relay. During any wiper motor function that uses low speed the BCM supplies the voltage to energize the WIPER CONTROL PCB Relay and battery voltage will be supplied from the WIPER CONTROL PCB Relay through the de-energized WIPER SPEED PCB Relay to the wiper motor low speed control circuit. During high speed wiper motor operation the WIPER CONTROL PCB Relay is energized as in low speed and the BCM provides a ground to energize the WIPER SPEED PCB 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.

DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
Have it checked for DTC'S - diagnostic trouble codes .

The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.
Your best bet , take your vehicle to a qualified repair shop or dealer . Hooking up a factory scan tool to see what the wiper switch inputs to the BCM are correct and outputs to relays are good .

Feb 11, 2017 | GMC Cars & Trucks

2 Answers

What is the relay location in the relay box


The problem would be in the stalk controller. The wiper Relay is what provides power to the motor for all settings, the delayed wipers, low speed, and high speed. There are not 3 relays, but 1 for all functions. If you have power to the high setting, the relay is working.

Jul 27, 2014 | 1998 Ford Ranger

1 Answer

Wipers not working


A little trick to try is untightening the mounting bolts of the wiper motor and then retightening. Sometimes its a matter of re-establishing a good ground.

The wiper parking problem is an internal wiper motor function. Some electric contacts are suppose to derail the motor and it is suppose to cycle into the locked position and turn off. Its last movements are automatic.

The intermittent part of the problem can be the contact switch on the turn stalk but there is a timer box on some models which the stalk switch controls. Some wiper motors have the timer box beneath a shield on the wiper motor. Those controls can be changed.

Mar 19, 2014 | Ford Fusion Cars & Trucks

2 Answers

Wiper speed control for a '97 Mercury Grand Marquis. What causes the wiper to work on high speed only?


Intermittent wiper control stopped working on my 1996 GM last spring. I ended up replacing the wiper motor ($100.00 part). Since I have found it on Amazon for $58 including shipping. It works fine now. Only bad part was all the "stuff" that has to come out (like dead leaves!) to get to the wiper motor. Also make sure you have your wipers in the down position when you replace the motor.
Hutch50

Sep 28, 2009 | 1997 Mercury Grand Marquis

1 Answer

Wiper does not stop wiping until engine shut-off


you need to replace multi function switch

May 08, 2009 | 2001 Oldsmobile Intrigue

2 Answers

Wipers do not work in intermittent position. They do work in low and high speeds but do not automatically return to the park position. They stop wherever you turn the switch off.


i belive that your wiper switch has gone out on the intermittent side. this is a very common problem.
I hope this helps you
Thanks
Please leave rating

Apr 21, 2009 | 2000 Isuzu Amigo

2 Answers

Intermittent wiper malfunction, 2004 Sable


replace the wiper relay.

http://cgi.ebay.com/ebaymotors/2004-04-Mercury-Sable-Service-Repair-Manual-Factory-OEM_W0QQitemZ370138266168QQcmdZViewItemQQimsxZ20090101?IMSfp=TL090101114011r5345

Dec 26, 2008 | 2001 Mercury Sable

1 Answer

2005 Dodge Ram 1500 4x4 - Intermittent wiper problem


There is a fault with Wiper stalk have got same prob with my 2006 ram 1500 5.7l hemi they should change under warrenty are with mine

Oct 12, 2008 | 2002 Dodge Ram Maxi

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