Here is a wire listing from a different source than your listing.
1. Horn(-) is listed as white (-)
2. Maybe your Supra does not have a Theft Module. Run the Hood wire out to the engine compartment with the supplied hood pin.
1997 Toyota Supra Last Update: 2/12/2009
Circuit Wire Color Location
Constant 12 volts WHITE & WHITE/ RED IGNITION SWITCH HARNESS
Ignition 12 volts BLACK/ WHITE IGNITION SWITCH HARNESS
Starter BLACK/ RED IGNITION SWITCH HARNESS
Dome Light RED / WHITE (-) 15 PIN CONNECTOR IN DR. KICK PANEL
Driver's Front Door Pin
Pass Front Door Pin
Driver's Rear Door Pin
Pass Rear Door Pin
Trunk Pin L GREEN (-) 13 PIN CONNECTOR IN DR. KICK PANEL
OEM Hood Pin
Parking Lamp (+) GREEN (+) 16 PIN CONNECTOR AT FUSE BLOCK
Parking Lamp (-)
Lock RED / WHITE 16 PIN BLUE CONNECTOR
Unlock GREEN/ RED IN DRIVER KICK PANEL * #209
* Child Safety Locks - BLUE/WHITE (-) In Same Connector As Door Lock Wires Above.
#209- See Child Safety Locks Diagram.
Tach Signal BLACK/ WHITE AT IGNITER OR ENGINE CONTROL MODULE *
Ignition Coil (-)
Injector (-)
Ignition #2 BLACK / YELLOW IGNITION SWITCH HARNESS
Ignition #3 N/A
Accessory GREEN IGNITION SWITCH HARNESS
Accessory #2
Accessory #3
Starter #2
Neutral Safety NOT GROUNDING TYPE - OEM SWITCH OPENS STARTER CIRCUIT
Brake Light GREEN / WHITE (+) AT SWITCH ABOVE BRAKE PEDAL
Parking Brake
Clutch Pedal
Reverse Light RED / BLACK (+) 13 PIN ORANGE CONN. IN DR. KICK PANEL
Rear Defrost N/A
Immobilizer Type
* Turbo Models - Tach Wire Is BLACK/ WHITE At Engine Control Module Located Below Passenger Dash. Non Turbo Models - Tach Wire IS BLACK/ WHITE At Igniter On Driver Strut Tower. On Both Models Tach Wire Can Also Be Found In 38 Pin Orange Connector Below Passenger Dash.
Window Up D\ RED / WHITE P\ RED / BLUE @ MAIN #211
Window Down R/ GREEN/ YELLOW S/ GREEN / WHITE SWITCH
Trunk Release N/A
Keysense YELLOW (-) IGNITION SWITCH HARNESS
OEM Horn WHITE (-) STEERING COLUMN HARNESS
Headlights RED OR YELLOW/RED (-) AT HEADLIGHT SWITCH
OEM Alarm Arm WHITE (-) 16 PIN BLUE CONNECTOR *
OEM Alarm Disarm GREEN/ YELLOW (-) IN DRIVER KICK PANEL
Vehicle Speed Sense
OEM Keyless Module - NO OEM KEYLESS PRESENT IN SCHEMATICS
Motor Lock N/A
Motor All Unlock N/A
Motor Driver Unlock
(disarm defeat) BLUE/RED 16 PIN CONNECTOR IN DR. KICK PANEL *
Trunk Release Disarm
OEM Lock Relays - DOOR LOCK CONTROL UNIT LOCATED IN PASSENGER KICK PANEL
Add On Security Type N/A
* Circuit Type - Reversal Rest At Ground.
When all else fails, Read the Instructions
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