Auto Service Professional

JUN 2018

Magazine for the auto service professional

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Page 23 of 69

22 A S P J u n e 2 018 W i p e r S e r v i c e W By Jeff Taylor Windshield wipers are an integral compo- nent on almost anything that moves, includ- ing planes, boats, trains, cars and trucks. And if you think they really haven't changed much since Mary Anderson invented them in 1903, you are mistaken. Sure, wipers have progressed from the hand and vacuum operated units of yesteryear to today's 12 volt electronically integrated systems, but like everything else on today's vehicles, the wiper sys- tem evolution continues. e use of a scan tool to diagnose wiper issues is now the norm. Retrieving trouble codes to aid in diagnostics, accessing bidirectional controls, initialization, setup procedures and even soware updates now require the use of a scan tool. But the use of a scan tool for wiper service isn't the only change that the wiper system has under- gone. e wipers' mechanical operation has pro- gressed as well. Changes in operation e principle of almost all windshield wiper drive system has been the same for a long time. A motor drives a set of gears that connect to a crank arm that creates a circular motion. e wiper motor connected crank arm is at- tached to a linkage that creates a reciprocal motion that moves the wiper arms to clear the windshield. ese parts can be bulky and need space for move- ment. Remember the size of the wiper assembly on a 1997-2005 U-body (Venture/Montana) GM minivan? is system was huge and cumbersome, taking up lots of room under the hood. e idea of removing all the intricate, bulky linkages needed to drive the wiper arms and re- place them with small, individual computerized motors that drive each wiper arm separately was conceived. The direct drive wiper motor and its service differences Ford has been using the direct drive method on the Escape (2013 and up), Fusion (2013 and up) and Focus (2011 and up). is design allows separate motors to drive each wiper arm independently. is frees up space under the hood and cowl area that would have previously been taken up by the wiper transmission and its linkage. ese charac- teristics lead to improved wiper efficiency, better total wiper clearing area, fewer parts, space sav- ings, reduced weight and wiring complexity. e key to Ford's direct drive wiper system is a reversible encoder motor assembly that drives each wiper arm independently. Each wiper mo- tor assembly contains the needed electronics and internal sensors (reporting wiper arm position) to control wiper speed, park position, service po- sition, winter park position, over-heat and load protection. ese motors are versatile and can be programmed to go as close to the A pillar and as low into the cowl area as the manufacturer wishes, all with minimal wiring and weight. Each of Ford's direct drive wiper motors require 12 volts, a ground circuit and communications circuits to operate. e use of a local interconnect network (LIN) communications circuit links one motor to the other and to the body control mod- Service in today's networked module-based wiper era Even windshield wiper systems are now elec- tronically controlled, enabling the use of a scan tool to determine issues. Wipers that aren't in the service position like the pickup truck on the right, make the windshield much harder to clear especially after this ice/sleet storm. SCAN TOOL WIPER

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