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Discussion Starter #1 (Edited)
This will convert your 'Bu from wiping several times after washing to completing a cycle and parking.

PLEASE NOTE: This modification will require you to cut two of your stock wires. Consider not doing this if you don't want to make this permanent adjustment.

:eek: DISCLAIMER: Only you are responsible for any damage, incidental or otherwise, as a result of attempting this modification.

Thanks to CMF member and technical guru Starship for his contribution of torque specs, component images, and GM disassembly instructions!

Definitions:
BCM = Body Control Module, located under the front portion of the center console
SPST = Single-pole Single-throw (on-off)

NOTE: Diagrams of BCM connectors are shown from the pin side, not the wire side. Use this to correctly identify the wires you need.

TOOLS NEEDED:
Wire cutter / stripper
Electrical tape
Small flat screwdriver
1/4-drive ratchet
Long extension
7MM socket
U-joint (for top screw on BCM - see steps 3 and 7)

Optional:
Soldering iron (butane is cordless and the most convenient)
Solder
Heat shrink tubing - assorted sizes
Scissors for tape & heat shrink tubing

PARTS NEEDED:
Blue = Auto parts store
Red = Radio Shack
Black = Your option

Bulb = Can be any of a number of small 12V bulbs, i.e. 168 or 194
Bulb socket (for above)
Add-A-Circuit = AutoZone part number BP-HHH-RP (#032416) for ATM fuses ($6.99)
Fuse = 10A ATM (same physical size as in car)

Diode = 2 required, can be of any design or size capable of passing coil amperage (These are polarized and can be damaged during soldering if a heatsink is not used.)
Wire = 18, 20, or 22 gauge - can be stranded or solid

SPST relay = 12V coil, with minimum contact rating of 5A
Ring terminal = Small (red) for wire above, sized for BCM screw (see steps 3 and 16)

Optional:
Project box

If you prefer crimp connectors:
Butt splices
Taps (allows you to tap into a wire and add a new one to it)

HOW TO:
1. Disconnect the negative battery cable. (I didn't, but it's my car.)

2. Remove the passenger side floor console extension panel.
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF/RightFloorConsoleExtensionPanel.gif

You will see the BCM. This is mine with 2 modifications (DRLs using the turn signal filaments; 1-wipe wash)


3. Remove 3 screws (1).
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCM.gif

4. Move the BCM (2, above) toward passenger side to find connector X4, on backside of BCM.
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCMBottomView.gif

5. Find the orange wire at pin B1 and cut it.
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCMConnectorX4.gif

6. Attach ~2 feet wire to end that is not on connector X4. I used solder and heat shrink tubing for a connection that won't need to be diagnosed in the future. Route it so that it will be available on the passenger side of the BCM.

7. Reinstall BCM to car. Tighten screws (1, above) to 1.5 N·m (13 in lb).

8. Identify BCM connector X3. (Two images)
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCMTopView.gif
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCMConnectorX3.gif

9. Find orange wire at pin C12 and cut it. Attach wire from step 6 to the end that is not on connector X3, plus add another wire that is ~1 foot long. (To the stock orange wire you will attach two wires: the one from step 6 and a new one.) Mark one or both as "Washer" and/or "Washer Switch".

10. Identify BCM connector X1 and disconnect it by gently prying (with screwdriver or other tool) the center gray tab just slightly away from the blue cover and moving it upward. Remove the blue cover by unsnapping it. You may have to move the bail back and forth to make room for its removal.

11. NOTE: The drawing shows the pin numbers from the PIN side, not the WIRE side. The second column of pins begins between pins 1 and 55 and is #19. Find the DARK GREEN wire at pin 22 and tap a new wire into it. Mark it as "Wiper".
http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCMConnectorsX1X2.gif

12. On same connector (X1), find YELLOW wire at pin 26 and tap a new wire into it. Mark it as "Park".

13. Reattach blue cover and reconnect X1 to J1 on BCM. Snap bail securely.

14. Using the schematic from my DropBox file (below, in Excel format), wire up your 1-wipe wash mod. For now, have a black wire ~1 foot long coming out as your ground. Also have a wire ~1 foot long coming out for the contact labeled "Wiper Switch Fuse". Later you will use the Add-A-Circuit wire as the source of your 12V.

http://dl.dropbox.com/u/4191695/1-Wipe Wash.xls

15. I mounted my mod in a project box and placed it at the front cavity of the console, nearest the firewall, wedged down into the foam. Place yours as you find appropriate.

16. Route black wire for ground over to 3rd screw at bottom BCM and attach a ring terminal to it. Screw it down.

17. Attach final wire for power to the Add-A-Circuit. Place a 10A fuse in the top hole that is in line with the wire.

18. Remove the fuse in the fuse block identified as "10A Wiper Sw" on the inside of the console cover.


19. Install it in the other opening in the Add-A-Circuit, then install the Add-A-Circuit in place of the stock fuse. The wire needs to be aimed down to the floor in order for the proper circuit protection. The +12V is on the top terminal and the protected circuit is on the bottom. In the image below, it is on the far right, second row, third from right, with a + at the inside and top of the fuse.

http://i1220.photobucket.com/albums/dd445/starshiptrooper010408/CMF -- DD/BCMTopView.gif

20. Double-check your wiring and the assembly of your mod components for proper polarity. (Diodes are polarized.)

21. Reattach the negative battery cable, if disconnected. The torque value on the battery clamp nut is 5 N·m (44 in lb).

22. Test by turning key to Acc or Run, then press the Wash button. The washer will squirt and the wipers will begin wiping. After releasing the wipers will complete a cycle and park.

FINALLY: If your circuit does not work, check it again for proper assembly of the component parts, including polarity of the diodes and each connection. If it still doesn't work, send me a PM. Please DO NOT POST a comment in this thread about any difficulties. I'll do my best to help each one if that is needed, but I'm only a member and volunteer here, just like you.
 

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Discussion Starter #2
Additional info:

The wash button provides +12V to the two orange wires. If you do not cut both of them so that they are not longer connected to the BCM then you will not defeat the stock feature of wiping until the rubber falls off.

The green wire for Wiper provides +12V to wiper relay #1 and operates them at low speed. To get high speed another wire energizes wiper relay #2. Both are energized for High speed operation through the use of a diode that is installed in the under-hood fuse block.

The yellow wire for Park comes from the wiper motor. It provides a -12V ground when the wiper motor is parked, and open (no connection) when the motor is running.

Refer to figure 92 in the schematic from my DropBox. Note: These schematics are for 2008 models. Some changes have taken place since then, but you can probably decipher them for yourself if you can read them.

http://dl.dropbox.com/u/4191695/08_chevy_malibu_complete.pdf
 

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Discussion Starter #4
In stock form, when you press wash the wipers continue for another 3 or 4 wipes before stopping. This mod will cause them to stop at the end of the same cycle that you release the wash button.
 

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Discussion Starter #6
It was fun if nothing else. Plus it answered a question posed about a week or so back. Took longer to do the write-up than the actual mod! ;)
 

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Moving to the How-To section....

Myself, I like the extra wipes. Helps get all the fluid off the window.

Good write-up non the less Bob.
 

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Myself, I like the extra wipes. Helps get all the fluid off the window.

Good write-up non the less Bob.
Me too, usualy add a few extra wipes even after the cycle ends to get any that splashes back on the windshield. :D
 

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Hmm, tough crowd.:D It sounds like there's a need for additional functionality, i.e., adjustable wipe timer after wash or something.
 

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Discussion Starter #11
What I learned from this is that the signal from the wash button goes through the BCM from back to front and out the orange washer wire. So, when I first experimented with the mod the washer still caused the wipers to go several times. That's when I learned I had to cut the orange wire on the front of the BCM as well. Then it worked as designed.

I appreciate the good words about the write-up. It was actually enjoyable doing the whole thing. And we all got to learn something about our cars, even if it wasn't earth shattering or going to be used by a lot of people.
 

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How many wipes does it take to get a clean....window :)
 

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Discussion Starter #14
2: The first one is while yer washin' and the second is to wipe it away.

At least, that's what the wise old owl tells me . . . ;)
 
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