C207 connector... what do all of the wires do?
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Senior Member
Joined: Nov 2004
Posts: 569
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From: San Diego
Car: 1985 Trans Am
Engine: LB9
Transmission: 700R4
C207 connector... what do all of the wires do?
People here may know this stuff better than the engine swap guys...
I'm trying to figure out the C207 connector in my passenger side behind the dash. It's a 1991 LO3, and I need to know which wires are supposed to do what for my LT1 swap.
Progress so far:
______________
|A|B|C|D|E|F|G|H|
----------------------
|J|K|L|M|N|P|R|
-------------------
Cavity |Socket Half |Function
A BRN
B RED
C BRN/WHT Service Engine Soon Indicator
D NO WIRE N/A
E WHT/BLK
F PNK/BLK
G WHT
H TAN/BLK TCC Solenoid
J ORN Output to ALDL pins M & E
K BRN
L DK BLU
M ORN
N ORN/BLK Neutral Safety Switch
P NO WIRE N/A
R PPL/WHT
Can anyone make any contributions as to the functions of the other wires in the harness? Trickster gave me the pinout diagram for the C207 a while ago, but they don't have the functions listed. Maybe there's a diagram out there that says... Thanks!
I'm trying to figure out the C207 connector in my passenger side behind the dash. It's a 1991 LO3, and I need to know which wires are supposed to do what for my LT1 swap.
Progress so far:
______________
|A|B|C|D|E|F|G|H|
----------------------
|J|K|L|M|N|P|R|
-------------------
Cavity |Socket Half |Function
A BRN
B RED
C BRN/WHT Service Engine Soon Indicator
D NO WIRE N/A
E WHT/BLK
F PNK/BLK
G WHT
H TAN/BLK TCC Solenoid
J ORN Output to ALDL pins M & E
K BRN
L DK BLU
M ORN
N ORN/BLK Neutral Safety Switch
P NO WIRE N/A
R PPL/WHT
Can anyone make any contributions as to the functions of the other wires in the harness? Trickster gave me the pinout diagram for the C207 a while ago, but they don't have the functions listed. Maybe there's a diagram out there that says... Thanks!
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Joined: Nov 1999
Posts: 1,000
Likes: 7
From: Pennsylvania
I just built a new TPI harness for a 1991 L03 Camaro this past weekend. This is what I recall from memory.
A BRN
B RED 10 Amp Fuse in Fuse Block (Injector)
C BRN/WHT Service Engine Soon Indicator
D NO WIRE N/A
E WHT/BLK ALDL Cavity B
F PNK/BLK 10 Amp Fuse in Fuse Block (ECM Ignition Power)
G WHT 10 Amp Fuse in Fuse Block (Injector)
H TAN/BLK TCC Solenoid (Yes, but it goes to ALDL Cavity F)
J ORN Output to ALDL pins M & E
K BRN
L DK BLU VATS Signal to ECM
M ORN Might be for the underhood light
N ORN/BLK Neutral Safety Switch (No, Park/Neutral Indicator Switch...there's a difference)
P NO WIRE N/A
R PPL/WHT 3amp Crank Fuse (For TBI ECM)
One of those brown wires is the VSS signal from the VSS Buffer. The other is the Air Diverter wire that goes to the ALDL. Can't remember which is which off the top of my head.
A BRN
B RED 10 Amp Fuse in Fuse Block (Injector)
C BRN/WHT Service Engine Soon Indicator
D NO WIRE N/A
E WHT/BLK ALDL Cavity B
F PNK/BLK 10 Amp Fuse in Fuse Block (ECM Ignition Power)
G WHT 10 Amp Fuse in Fuse Block (Injector)
H TAN/BLK TCC Solenoid (Yes, but it goes to ALDL Cavity F)
J ORN Output to ALDL pins M & E
K BRN
L DK BLU VATS Signal to ECM
M ORN Might be for the underhood light
N ORN/BLK Neutral Safety Switch (No, Park/Neutral Indicator Switch...there's a difference)
P NO WIRE N/A
R PPL/WHT 3amp Crank Fuse (For TBI ECM)
One of those brown wires is the VSS signal from the VSS Buffer. The other is the Air Diverter wire that goes to the ALDL. Can't remember which is which off the top of my head.
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Joined: Feb 2000
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
If I remember correctly, the wires are slightly different depending on the year of the car and the engine type.
This is from my 88 Firebird Manual and is for the TPI motors,
F also goes to the VATS Decoder module, and the ESC Module on the engine side.
M goes to the "A" port on the ALDL, it should be BLK/WHT going into the harness from the ECM and it is grounded.
R also goes to the Cold Start Valve and the Cold Start switch.
K goes to the VSS Buffer
L goes to the VATS Decoder Module
This is from my 88 Firebird Manual and is for the TPI motors,
F also goes to the VATS Decoder module, and the ESC Module on the engine side.
M goes to the "A" port on the ALDL, it should be BLK/WHT going into the harness from the ECM and it is grounded.
R also goes to the Cold Start Valve and the Cold Start switch.
K goes to the VSS Buffer
L goes to the VATS Decoder Module
TGO Supporter
Joined: Nov 1999
Posts: 1,000
Likes: 7
From: Pennsylvania
Originally posted by Zepher
If I remember correctly, the wires are slightly different depending on the year of the car and the engine type.
This is from my 88 Firebird Manual and is for the TPI motors,
F also goes to the VATS Decoder module, and the ESC Module on the engine side.
M goes to the "A" port on the ALDL, it should be BLK/WHT going into the harness from the ECM and it is grounded.
R also goes to the Cold Start Valve and the Cold Start switch.
K goes to the VSS Buffer
L goes to the VATS Decoder Module
If I remember correctly, the wires are slightly different depending on the year of the car and the engine type.
This is from my 88 Firebird Manual and is for the TPI motors,
F also goes to the VATS Decoder module, and the ESC Module on the engine side.
M goes to the "A" port on the ALDL, it should be BLK/WHT going into the harness from the ECM and it is grounded.
R also goes to the Cold Start Valve and the Cold Start switch.
K goes to the VSS Buffer
L goes to the VATS Decoder Module
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