Windshield Wiper Harness - Circuit 3/5

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Major System Category: ISIS Wiring
Task: Connect steering column controls to wiper motor and washer pump
Parts:
Power Cell: 3
Circuit: 5 - WHITE
Master cell: TAN/BLACK
Prerequisite Tasks: Install the steering column
Additional Costs: N/A
Time Requirement: 2 hours (alone) / 4 hours if you have your 4 year old grand son help
Date Started: August 17, 2013

Date Completed: August 17, 2013

Zachary wanted to cut wire. He cut this piece into teensy-weensy pieces.

One of the things that has been bugging me for the past week or so is how does the washer motor in the windshield fluid reservoir get power and signal. It seems like a simple thing, but I hadn't really dug into the problem until today. Zachary, one of my grandsons, was here to help. He did a great job cutting up wire. In fact, he demolished two scrap pieces of yellow and green wire.

Circuit drawing of the wiper motor and control stalk.

The manual has a section on the windshield wiper harness. You can't really tackle this task until both the wiper motor and the steering column are attached. These two assemblies form the end points of the windshield wiper harness. The wiring on each end of the harness is slightly different.

Steering column wiper harness. The lower yellow, green, gray and pink wires extend to the wiper motor. The second yellow splices into the door popper circuit.  The purple is not used.

The steering column harness can be traced from the control stalk on the right hand side under the column and over to a plug. It is zip tied together with other wires for a while. What you want to find is the following:

• Pink (washer pump)
• Gray
• Dark Green
• Purple (not used)
• Yellow (there are two wires) (power)

This is the bundle coming off the wiper motor.

The wiper motor has a wrapped bundle of wires coming out the front of the motor pointed towards the front left corner of the car. This has the following wires:

• Gray
• Dark Green
• Purple (not used)
• Yellow (power)
• Black (ground)

Terminal block at hte wiper motor. The yellow, green and gray are spliced together. The black is spliced into a master ground/ The red extends on to the washer pump.

The build manual indicates the purple wire should be cut because it is out of specification for the GTM's wipers. My solution was to not extend tthe purple wire at all. 

1. I wired up a terminal block that can be mounted under the steering column and ran wires to the wire motor, where I wired up a second terminal block. 
2. I extended the gray, dark green and yellow wires between both terminal blocks. 
3. I extended the pink wire only from the steering column terminal block to the washer pump. I had to attach a blade socket to end of this wire.
4. I ran the ground for the wiper motor in place of the pink wire on the second terminal block.
5. I extended a ground wire (with a blade terminal) to the washer motor.
6. The wiper motor ground and washer pump grounds are extended to the same terminal ground block used for the InReserve and Horn.

Washer pump with power and ground leads.