Variable Intermittent Wiper
The following explains how to install a 'programmable' intermittent relay which will give a intermittent time interval from 2 to 45 seconds. The time interval is programmed using the wiper stalk switch.
The relay is Bosch P/N 0 986 335 058. It should cost between $30 and $40 from any one of the following:
This relay takes the place of the relay in position #9 in the main fuse box under the hood. The relay to remove is white and has a large 271 printed on the top. Its part number on the side was 443 955 531. Remove this and replace it with the 'programmable' relay.
Rear Wiper Problem
Symptoms: Rear wiper skips and chatters and may become stuck out of resting position.
The problem could be the wiper itself or the motor. To find out which, run the wiper with the blade lifted off of the window. If the arm still has problems with movement, check out the motor, otherwise it's the blade.
If it is old and not often used, the blade becomes "used to" a certain orientation and will no longer contact the window at a right angle, favoring one wiping direction while skipping in the other direction. Easiest fix is to replace the blade. The Bentley manual suggests bending the wiper arm by rotating it until the blade is oriented correctly.
The lubricant/grease inside the motor will congeal and harden with age. If the wiper works fine at the end of a hot day, that's a clue that you need to relube the motor. The wiper assembly consists of a motor, attached to a spiral worm gear that's attached to a round toothed gear. The round gear drives an arm that moves the wiper shaft. On the back side of the round gear are 3 contact traces that rub against some electrical "wipers" that come through the wiper case to the wire connectors. What the wiper and traces do is reverse the motor direction when the end of the track is reached.The lube/grease which aids the gear trace/wiper hardens and lifts the electrical wiper off of the trace. If you open the case of the wiper (4? screws once you remove the inside hatch cover panel), and operate the windshield wiper, you may see some arcing and sparking through the gear. It is sort of an opaque white. I am not sure if the traces are riding up and arcing when the circuit is opening or if the electrical wipers are shorting out to the case. If you remove the hardened grease and replace with fresh stuff, the wiper will work.
The key to disassembly is to:
Beware! If the motor becomes jammed during operation, it may continue to draw current. I have heard that the rear wiper circuit is grossly under-fused, so the motor will quickly heat up to dangerous temperatures before any fuses blow.
See also: Headlight Washer Jets
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