Thought this might be helpful to someone..
C4 corvette wire info
MODEL YEAR(S)
CORVETTE 1984 -1985
KEY T-HARNESS IMMOBILIZER
N/A N/A GM's VATS ANTI-THEFT System (if Equipped, Ignition Key has Chip) Requires 791 Bypass Module
PART COLOR LOCATION
12 VOLT CONSTANT RED (+) IGNITION SWITCH HARNESS
STARTER YELLOW (+) IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK (+) IGNITION SWITCH HARNESS
IGNITION 2 N/A
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 ORANGE (+) IGNITION SWITCH HARNESS
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) N/A
PARKING LIGHTS ( + ) BROWN (+) @ HEADLIGHT SWITCH
POWER LOCK LIGHT BLUE (TYPE A) IN EITHER KICK PANEL
POWER UNLOCK BLACK (TYPE A) IN EITHER KICK PANEL
DOOR TRIGGER WHITE (-) @ UNDER DASH LIGHT
DOMELIGHT SUPERVISION USE DOOR TRIGGER, Requires #775 Relay
TRUNK RELEASE BROWN (-), Requires #775 Relay @ HATCH RELEASE SWITCH
SLIDING POWER DOOR N/A
HORN BLACK (-) @ STEERING COLUMN HARNESS
TACH WHITE or PURPLE/WHITE @ IGNITION COIL or DISTRIBUTOR
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM LIGHT GREEN (-) IN DRIVERS KICK PANEL
ANTI-THEFT See NOTE *1 GM's VATS System @ Ignition Switch
EXTRA INFORMATION
NOTE *1 The VATS (Vehicle Anti-Theft System) wire may be (2) thin YELLOW wires, (2) thin TAN wires or (2) thin WHITE wires, these wires are usually in a ORANGE or BLACK HEAT SHRINK TUBE, but at times are left out of the tube and ran by themselves up under the dash to the Security Module under the Dash.
MODEL YEAR(S)
CORVETTE 1986 -1989
KEY T-HARNESS IMMOBILIZER
N/A N/A GM's VATS ANTI-THEFT System (if Equipped) Requires 791 Bypass Module
PART COLOR LOCATION
12 VOLT CONSTANT RED (+) IGNITION SWITCH HARNESS
STARTER YELLOW (+) IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK (+) IGNITION SWITCH HARNESS
IGNITION 2 N/A
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 ORANGE (+) IGNITION SWITCH HARNESS
ACCESSORY/HEATER BLOWER 2 BROWN (+) IGNITION SWITCH HARNESS
KEYSENSE N/A
PARKING LIGHTS ( - ) N/A
PARKING LIGHTS ( + ) BROWN (+) @ HEADLIGHT SWITCH
POWER LOCK LIGHT BLUE (TYPE C) IN EITHER KICK PANEL
POWER UNLOCK BLACK (TYPE C) IN EITHER KICK PANEL
DOOR TRIGGER WHITE (-) @ UNDER DASH LIGHT, See NOTE *3
DOMELIGHT SUPERVISION USE DOOR TRIGGER, Requires #775 Relay
TRUNK RELEASE BLACK (+), Requires #775 Relay @ DECK RELEASE RELAY, See NOTE *2
SLIDING POWER DOOR N/A
HORN BLACK (-) @ STEERING COLUMN HARNESS
TACH WHITE or PURPLE/WHITE @ IGNITION COIL or DISTRIBUTOR
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM LIGHT GREEN (-) IN EITHER KICK PANEL
ANTI-THEFT See NOTE *1 GM's VATS System @ Ignition Switch
EXTRA INFORMATION
NOTE *1 The VATS (Vehicle Anti-Theft System) wire may be (2) thin YELLOW wires, (2) thin TAN wires or (2) thin WHITE wires, these wires are usually in a ORANGE or BLACK HEAT SHRINK TUBE, but at times are left out of the tube and ran by themselves up under the dash to the Security Module under the Dash.
NOTE *2 the DECK RELEASE Relay is located at the right rear corner of the luggage compartment.
NOTE *3 use the Passenger DOOR LOCK Switch as the MASTER SWITCH when testing.
MODEL YEAR(S)
CORVETTE 1990 -1993
KEY T-HARNESS IMMOBILIZER
N/A N/A GM's VATS ANTI-THEFT System (if Equipped, Ignition Key has Chip) Requires 791 Bypass Module
PART COLOR LOCATION
12 VOLT CONSTANT RED (+) IGNITION SWITCH HARNESS
STARTER YELLOW (+) IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK (+) IGNITION SWITCH HARNESS
IGNITION 2 N/A
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 ORANGE (+) IGNITION SWITCH HARNESS
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) N/A
PARKING LIGHTS ( + ) BROWN (+) @ HEADLIGHT SWITCH
POWER LOCK LIGHT BLUE (TYPE C) See NOTE *2 IN EITHER KICK PANEL
POWER UNLOCK BLACK (TYPE C) See NOTE *2 IN EITHER KICK PANEL
DOOR TRIGGER BLACK/WHITE (-) and BLACK/YELLOW (-) Use both, See NOTE *3 IN EACH KICK PANEL
DOMELIGHT SUPERVISION WHITE (-), Requires #775 Relay @ UNDER DASH LIGHT
TRUNK RELEASE BROWN (-), Requires #775 Relay @ HATCH RELEASE SWITCH
SLIDING POWER DOOR N/A
HORN BLACK (-) @ STEERING COLUMN HARNESS
TACH WHITE or PURPLE/WHITE @ IGNITION COIL
WAIT TO START LIGHT N/A
BRAKE WHITE (+) or LIGHT BLUE (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM LIGHT GREEN (-) IN EITHER KICK PANEL
ANTI-THEFT See NOTE *1 GM's VATS System @ Ignition Switch
EXTRA INFORMATION
NOTE *1 The VATS (Vehicle Anti-Theft System) wire may be (2) thin YELLOW wires, (2) thin TAN wires or (2) thin WHITE wires, these wires are usually in a ORANGE or BLACK HEAT SHRINK TUBE, but at times are left out of the tube and ran by themselves up under the dash to the Security Module under the Dash.
NOTE *2 This is a TYPE "C" DOOR LOCKING SYSTEM, the PASSENGER switch is the MASTER switch for testing.
NOTE *3 The BLACK/WHITE (-) is for the DRIVERS DOOR and the BLACK/YELLOW (-) is for the PASSENGER DOOR, use both and DIODE ISOLATE when connecting to an ALARM SYSTEM.
MODEL YEAR(S)
CORVETTE 1994 -1996
KEY T-HARNESS IMMOBILIZER
N/A N/A GM's VATS ANTI-THEFT System, Ignition Key has Chip, Requires 791 Bypass Module
PART COLOR LOCATION
12 VOLT CONSTANT RED (+) IGNITION SWITCH HARNESS
STARTER YELLOW (+) IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK (+) IGNITION SWITCH HARNESS
IGNITION 2 N/A
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 ORANGE (+) IGNITION SWITCH HARNESS
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) N/A
PARKING LIGHTS ( + ) BROWN (+) @ HEADLIGHT SWITCH
POWER LOCK RED/BLACK (TYPE C) See NOTE *2 IN EITHER KICK PANEL
POWER UNLOCK ORANGE/BLACK (TYPE C) See NOTE *2 IN EITHER KICK PANEL
DOOR TRIGGER BLACK/WHITE (-) and GRAY/BLACK (-) Use both, See NOTE *3 IN EACH KICK PANEL
DOMELIGHT SUPERVISION BLACK/WHITE (-), Requires #775 Relay IN DRIVERS KICK PANEL
TRUNK RELEASE LIGHT BLUE (-), Requires #775 Relay @ HATCH RELEASE SWITCH
SLIDING POWER DOOR N/A
HORN BLACK (-) @ STEERING COLUMN HARNESS
TACH RED/BLACK @ ECM, above the BATTERY
WAIT TO START LIGHT N/A
BRAKE WHITE (+) or LIGHT BLUE (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM GREEN (-) IN EITHER KICK PANEL
ANTI-THEFT See NOTE *1 GM's VATS System @ Ignition Switch
EXTRA INFORMATION
NOTE *1 The VATS (Vehicle Anti-Theft System) wire may be (2) thin YELLOW wires, (2) thin TAN wires or (2) thin WHITE wires, these wires are usually in a ORANGE or BLACK HEAT SHRINK TUBE, but at times are left out of the tube and ran by themselves up under the dash to the Security Module under the Dash.
NOTE *2 This is a TYPE "C" DOOR LOCKING SYSTEM, the PASSENGER switch is the MASTER switch for testing.
NOTE *3 The BLACK/WHITE (-) is for the DRIVERS DOOR and the GREY/BLACK (-) is for the PASSENGER DOOR, use both and DIODE ISOLATE when connecting to an ALARM SYSTEM.
These and most any other vehicle diagram can be found here:
http://www.bulldogsecurity.com/bdnew/ve ... agrams.asp
you can,t always trust scanners suggestions either, I recently had a code scanner suggest a cooling fan relay was defective,
replacing it with a known good relay that was working in an identical car had no effect neither relay tested bad either..
the problem was tracked down to a loose ground and a heat sensor that tested good at its rated ohms resistance, but failed to trigger the relay
experience suggested I test the relay by inserting a resistor of the known rated ohms to trigger the relay into the pigtail that connected to the sensor,
a simple test like that proved the sensor was defective as the fan and relay function with the resistor in the pigtail.
https://www.sparkfun.com/products/10969
https://www.jameco.com/z/GB115-1-8-1-4-and-1-2-Watt-Resistor-Grab-Bag-Tolerances-2-5-10-_134130.html
https://www.diyaudioandvideo.com/Electronics/ResistorColorCodes/
http://garage.grumpysperformance.co...t-find-whats-wrong-start-with-the-basics.609/