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99 GMC Suburban: 4WD...I need a wiring diagram for the transaxle

I have a 99 GMC...
I have a 99 GMC Suburban 1500 4WD. I need a wiring diagram for the transaxle. I have a hanging plug with 6 wires on it. I do not see where it goes but there are 3 bare wires coming directly out of the transaxle. The SERVICE 4WD light is on the dash.
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2/5/2010
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: GM
Satisfied Customers: 3,432
Experience: 37 years of dealership exp. Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer
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Hello and welcome, are you referring to the transfer case connector?
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Customer reply replied 7 years ago

Yes, sorry I'm not a mechanic. You're right it's the transfer case. The part the acutates the 4WD.

 

Mark

Ok, here is a picture of the connector location. also included what the wire colors are. if there is more info you need, please let me know.

 

 

 

graphic

(1)Vehicle Speed Sensor (VSS) Connector
(1)Vehicle Speed Sensor (VSS) Connector
(2)Harness Bracket
(2)Harness Bracket
(3)VSS Connector
(4)Rear Propshaft Speed Sensor Connector
(5)Rear Propshaft Speed Sensor
(6)Automatic Transfer Case
(7)VSS
(8)Front Propshaft Speed Sensor
(9)Front Propshaft Speed Connector
(10)Left Frame Rail
(11)Encoder Motor Connector
(12)VSS Harness
(13)VSS Adapter Harness Connector

 

graphic

 

 

 

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1554

Transfer Case Encoder Signal Return

B

DK BLU/WHT

1557

Transfer Case Postion Switch Encoder Signal - Channel A

C

RED/WHT

1556

Transfer Case Postion Switch Encoder Signal - Channel C

D

YEL/BLK

1558

Transfer Case Postion Switch Encoder Signal - Channel B

E

LT GRN/BLK

431

Reference Voltage Feed - 8 Volt

F

BRN/WHT

1555

Transfer Case Postion Switch Encoder Signal - Channel P

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Customer reply replied 7 years ago

That looks good. Do you also have a picture of the male end of the plug shown with the color of the wires. There is only 3 wires hanging down. The plug is the one shown.

 

Thanks,

Mark

even GMs books are not showing the male end, but the color of the wire location should be the same as the picture i posted earlier.

 

graphic

goodwrench9124
goodwrench9124, ASE Certified Technician
Category: GM
Satisfied Customers: 3,432
Experience: 37 years of dealership exp. Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer
Verified
goodwrench9124 and 87 other GM Specialists are ready to help you
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Customer reply replied 7 years ago

OK,, I think I almost got it figured out but I am missing something. Basically, I need to know how the 6 pin connector connects to the three wires. Am I missing 3 additional wires or do the 4 encoder signals go through one wire? That's the only way I can make sense of it.

Will the manufacturer have the male end with a schematic?

 

 

P.S. when I'm done with this, I have a few other problems I need to iron out on this vehicle. Do you do AC work too?

sorry, I wasn't thinking straight. the 6 way connector plugs into the encoder motor. all 6 wires should be in the connector. are you saying there is three wires missing from the connector?

 

graphic

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Customer reply replied 7 years ago
The female end has all 6 wires going into it. The male end is missing and there are three wires hanging out of the transfer case not connected to anything.
in the picture I first posted, can you post me the number of the connector where you see these three wires that are not connected to anything?
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Customer reply replied 7 years ago

Looks like might be around #9. hard to tell with that pic. There are other wires coming out of the same area but they are properly connected to a plug

 

number 9 is a prop speed sensor connector, what are the color of the wires?
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Customer reply replied 7 years ago

I got Black with a white stripe

Brown with a white stripe

Green with a black stripe

ok, these are wires for the transfer case encoder motor. do you happen to have a digital camera to take a picture then upload to me? if not, do you see where the the 6 way connector plugs into the transfer case?
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Customer reply replied 7 years ago

I will try...

 

Ok, if not. we will try a different approach. is this something than can wait until tomorrow? I will be logging off, but I can let another expert help?
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Customer reply replied 7 years ago
Here comes the pics..............graphicgraphicgraphicgraphicgraphic
Customer reply replied 7 years ago

Yeah, it can wait...no problem. I think I am far from getting this fix at this point.

 

Thanks,

Mark

Customer reply replied 7 years ago
Relist: Good info but the Tech is not online at the moment.
Good info but the Tech is not online at the moment
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goodwrench9124
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: GM
Satisfied Customers: 3,432
3,432 Satisfied Customers
Experience: 37 years of dealership exp. Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer

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