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ASEMaster35yrs
ASEMaster35yrs, Chevy Technician
Category: Chevy
Satisfied Customers: 2042
Experience:  ASE Certified since 1972,Master Auto tech,Heavy Truck Tech ,chev dealer tech
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94 chevy: I need the connector pinout for connector

Customer Question

I need the connector pinout for connector C100 on my 94 chevy pickup. where could I find that?
Submitted: 4 years ago via Mitchell1DIY.
Category: Chevy
Expert:  GMKindl replied 4 years ago.
Hello and welcome to Just Answer. Where is connector c100 located in the truck? Do you have the connector apart? Is there a specific circuit you are concentrating on?
Customer: replied 4 years ago.
c100 is on the bulkhead right in front of the driver. the c100 connector runs the engine harness into the cab for things like ses light, oil pressure light, brake warning lights, serial data, ect. I need the pinout of the entire connector to know what each circuit running through the connector is and what each wire on my connector is associated with.
Expert:  ASEMaster35yrs replied 4 years ago.

Here is a picture of the OBD I connector:

graphic

Do you need a wiring diagram for the vehicle?

You can view the diagrams at these links:

 

http://www.chiltonlibrary.com/content/images/9102/images/91026w01.pdf

 

http://www.chiltonlibrary.com/content/images/9102/images/91026w02.pdf

 

http://www.chiltonlibrary.com/ContentViewer/CVFrameset.aspx

Customer: replied 4 years ago.
I have wire diagrams from alldata. but for some reason alldata doesnt give the pinout for conector c100. I looked up a 97 and they have exactly what I need for that year but not for the 94. I'm adapting a 97 harness to work in a 94 and need the pinout of c100 so I can wire up the 97 harness to plug into the old 94 c100 location to give my dash proper input from the new 97 computer. I'm transfering the wires from the 97 c100 plug to a blank 94 style c100 plug.
Expert:  ASEMaster35yrs replied 4 years ago.

Did you try this link? This has all the wiring diagrams for 88-98 so you can compare them. Go to bottom of page and click on view diagrams.

http://www.chiltonlibrary.com/ContentViewer/CVFrameset.aspx

Index of Wiring DiagramsView Image
Sample Diagram: How to Read and Interpret Wiring DiagramsView Image
Wiring Diagram SymbolsView Image
1988-98 GM-C/K Series Wiring SchematicView Image
1988-98 GM-C/K Series Wiring SchematicView Image
1988-90 GM-R/V Series Wiring SchematicView Image
1988-90 GM-R/V Series Wiring SchematicView Image
1991 GM-R/V Series Wiring SchematicView Image
1991 GM-R/V Series Wiring SchematicView Image
1991-98 GM Truck Wiring SchematicView Image
1994 Pick-Up/Sierra 4.3L and 7.4L W/MT Engine SchematicView Image
1994 GM Truck 5.0L and 5.7L w/MT Engine SchematicView Image
1994 Pick-Up/Sierra 6.5L Turbo Diesel w/MT Engine SchematicView Image
1994 GM Truck 4.3L, 5.0L, 5.7L and 7.4L w/AT Engine SchematicView Image
1994 Pick-Up/Sierra 6.5L Turbo Diesel w/AT Engine SchematicView Image
1995 Pick-Up/Sierra 4.3L and 7.4L w/MT Engine SchematicView Image
1995 GM Truck 5.0L and 5.7L w/MT Engine SchematicView Image
1995 Pick-Up/Sierra 6.5L Diesel/Turbo Diesel w/MT Engine SchematicView Image
1995 GM Truck 4.3L, 5.0L, 5.7L, and 7.4L w/AT Engine SchematicView Image
1995 Pick-Up/Sierra 6.5L Turbo Diesel w/AT Engine SchematicView Image
1996-98 Pick-Up/Sierra 4.3L w/AT Engine SchematicView Image
1996-98 GM Truck 5.0L and 5.7L Engine SchematicView Image
1996-98 Pick-Up/Sierra/Suburban 7.4L W/MT Engine SchematicView Image
1996-98 Pick-Up/Sierra/Yukon/Tahoe 6.5L Turbo Diesel Engine SchematicView Image
1994 GM Truck Chassis SchematicView Image
1994 GM Truck Chassis SchematicView Image
1995-98 GM Truck Chassis SchematicView Image
1995-98 GM Truck Chassis SchematicView Image
1994-98 GM Truck Chassis SchematicView Image

 

Also check these links:

http://www.mifbody.com/vbulletin/showthread.php?25281-1994-to-1995-Harness-Discrepancies

 

http://pinoutsguide.com/pin_CarElectronics.shtml

 

http://pinoutsguide.com/CarElectronics/gm_car_obd_ii_pinout.shtml

 

Did you look at the OBD I diagram above? It shows what each pin is for.

If you intend to use a 97 wiring harness and computer and components, you should be using a OBDII C-100 connector.

 

Is this is what your looking for?

 

graphic

 

OBD 2 pinout for GM cars

Should be suitable for most modern GM cars - Buick, Cadillac, Chevrolet, Daewoo
GMC, Holden, Opel, Vauxhall.

Most GM cars produced in 1996-2003 use J1850-VPW interface. GM cars produced in 2003-2006 use J1850-VPW interface or CAN. Most cars produced after 2006 are equipped with CAN bus.

 

Pin
Number
Pin
Name
Description (may be empty)
1Second UART
2J1850J1850(+) VPW
3Comfort
4GNDChassis ground
5SGNDSignal Ground
6HS-CANPCM
7K-Linen/c
8CCM
9first UART
10PWMn/c
11EVA controller
12ABS
13SIR
14HS-CAN(-)E&C
15L-Linen/c
16Battery+Battery +, unswitched

 

 

Since 2002, there is another pinout - GM-LAN (for vehicles equipped with CAN bus)

Pin
Number
Pin
Name
Description (may be empty)
1SW-LS-CAN (33kB) or DW-FT-CAN (+) (<125kB)
2J1850n/a
3MS-CAN (+) (95kB)
4GNDChassis ground
5SGNDSignal Ground
6HS-CANISO 15765 HS-CAN (+) (500kB)
7K-Linen/a
8n/a
9DW-FT-CAN (-) (<125kB)
10PWMn/c
11MS-CAN (-) (95kB)
12K-Line (KW82 Prot.)
13reserved
14HS-CAN(-)ISO 15765 HS-CAN (-) (500kB)
15L-Linen/a
16Battery+Battery +, unswitched

 

Some OBD-II cables schemes:

OBD-2 ISO 9141-2 (14230-4, KWP2000) simple serial cable
OBD-2 J1850 PWM, J1850 VPW serial ELM327 cable
OBD-2 universal ISO 15765-4 CAN, SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 and SAE J1939 diagnostic cable

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