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Wiper Component Replacement
 
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Pelican Technical Article:

Wiper Component Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

*****

Tools:

Phillips & flathead screwdriver, socket set, 10mm, 13mm, T27 Torx bit socket

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Wiper motor, wiper motor assembly, wiper blades, wiper cowl trim.

Hot Tip:

Use paint or crayon to mark location of wiper arms before removing

Performance Gain:

Repair faulty wiper blades, wiper motor or wiper motor linkage

Complementary Modification:

Replace wiper blades when servicing motor

The BMW Z3 wiper and washer system consists of the following:

  • Windshield wiper motor, arms and blades
  • Tailgate window wiper motor, arm and blade (Coupe)
  • Washer fluid reservoir with fluid level sensor in engine compartment
  • Windshield washer pump in fluid reservoir
  • Headlight washer pump in fluid reservoir (if equipped)
  • Tailgate window washer fluid reservoir in right rear, behind trim panel (Coupe)
  • Tailgate window washer pump in fluid reservoir (Coupe)
  • Heated windshield washer nozzles
  • Headlight washer nozzles in front bumper (if equipped)
  • Tailgate window washer nozzle (Coupe)
  • Wiper and washer switch at right side of steering column 
  • Switch controls wiper intervals and other functions via the General Module (GM V)
  • Rain sensor at top of windshield (if equipped)

This article will cover replacing windshield wiper components. The wiper motor itself can fail, creating a situation where the wipers do not work or do not properly park. If the wipers do not work at all, first check the wiper fuse. Then check for the battery positive signal to the motor when the wipers are switched ON (refer to an up-to-date wiring diagram). Then check that the wiper pivots move freely and are not bound up with corrosion. To do this, follow the steps below to remove the wiper assembly. Once removed, disconnect the wiper linkage from the wiper motor. Then confirm that the wiper transmission moves without binding.

To avoid marring the paint and trim, work with a plastic prying tool or wrap a screwdriver tip with masking tape before prying out body or interior items.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Before beginning, note the position of the wiper arms to the bottom of the wiper cowl.
Figure 1

Before beginning, note the position of the wiper arms to the bottom of the wiper cowl. Take a measurement or snap a photo, this will help to get the wiper arms back in the same place when reinstalling.

Open the hood, then remove the wiper arm nut trim cap.
Figure 2

Open the hood, then remove the wiper arm nut trim cap. Do this for each wiper arm.

Next, remove the two 16mm wiper arm nuts.
Figure 3

Next, remove the two 16mm wiper arm nuts. Photo shows left side wiper arm, the right side wiper arm is the same.

I like to mark the position of the wiper arms using a crayon (yellow arrow).
Figure 4

I like to mark the position of the wiper arms using a crayon (yellow arrow). This helps to get the wiper arm in same position when reinstalling.

Next, you have to remove the wiper arms.
Figure 5

Next, you have to remove the wiper arms. What I do is open the hood, then wiggle the wiper arm to remove from it from the shaft. If you press on the wiper arm near the pivot it will loosen up, then continue to wiggle it off. Be careful not to scratch paint when wiper arm comes loose.

Next, pull the weather strip (green arrow) off the front of the wiper cowl.
Figure 6

Next, pull the weather strip (green arrow) off the front of the wiper cowl.

Working at the wiper cowl, remove the plastic retaining rivet (green arrow).
Figure 7

Working at the wiper cowl, remove the plastic retaining rivet (green arrow). I prefer to use a trim panel tool to lever these out, as the tool grabs it evenly and they usually don't break. There are eight of these, remove them all.

Then lever out the bottom of the rivet using a trim panel tool.
Figure 8

Then lever out the bottom of the rivet using a trim panel tool. Remove all eight of them.

Next, pull the weather strip (green arrow) off the left side of the wiper cowl.
Figure 9

Next, pull the weather strip (green arrow) off the left side of the wiper cowl. Then repeat this step for the right side.

Now you have to remove the wiper cowl trim.
Figure 10

Now you have to remove the wiper cowl trim. Start by grabbing at right corner and pulling up, gently removing the trim piece from the base of the windshield. Once detached, remove from vehicle and store in a safe place.

Now itÂ's time to remove the wiper assembly.
Figure 11

Now it's time to remove the wiper assembly. Start by removing two T27 Torx wiper assembly fasteners (green arrows).

Once the fasteners are removed, slide the wiper assembly toward the right side of the vehicle.
Figure 12

Once the fasteners are removed, slide the wiper assembly toward the right side of the vehicle. The wiper motor has to squeeze out past the cowl and the blower motor. It is tight, but it will fit.

With the wiper assembly partially removed, disconnect the wiper motor electrical connector by sliding the locking tab in the direction of the green arrow.
Figure 13

With the wiper assembly partially removed, disconnect the wiper motor electrical connector by sliding the locking tab in the direction of the green arrow. The connector will automatically unplug as you do this.

Next you have to detach the wiper transmission from the motor.
Figure 14

Next you have to detach the wiper transmission from the motor. I prefer to use a pry bar (green arrow) and lever the transmission off the motor.

Then remove the lower transmission linkage the same way.
Figure 15

Then remove the lower transmission linkage the same way. Be sure to note the position of the rubber washers when removing (green arrows).

To replace the wiper motor, note the position of the wiper lever, then remove the 13mm wiper motor lever nut (yellow arrow).
Figure 16

To replace the wiper motor, note the position of the wiper lever, then remove the 13mm wiper motor lever nut (yellow arrow). Then remove the three 10mm wiper motor fasteners. If you are reusing the wiper arm pivot assembly it is a good idea to inspect the wiper arm pivots. Once the linkage assembly has been removed, check that both wiper pivots move freely and without resistance. You can do this by grabbing linkage and moving back and forth. Install new wiper motor and on linkage assembly. Then use a pair of channel locks to snap the transmission linkage onto the wiper motor. Be sure this engages properly. You don't want to find out later it wan't securely installed when you reassemble everything. Then install assembly into vehicle. Install all fasteners finger tight, then tighten, this ensures proper assembly alignment. Connect battery and turn wipers ON then OFF. This will PARK the wipers. Reinstall cowl and associated parts. Then install wiper arms with blades in position they were removed and tighten fasteners. Install trim caps. Then reassemble remaining items in reverse order of removal. Once complete, check wiper operation.

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Page last updated: Mon 12/5/2016 02:07:54 AM