CRUISE CONTROL OPTION
One advantage to DBW engines is the “Cruise Control” option is available, and relatively easy to hook up. Since the throttle blade is controlled electrically and ultimately by the ECM, only a few properly wired switches are required to have a full functioning “Cruise Control” feature. Note: Use of the 4L60e or 4L80e transmission is also required.
DK BLUE - Cruise Set/Coast Signal
GRAY - Cruise On Signal
GRAY/BLK - Cruise Resume/Accel Signal
LT BLUE - Stop Lamp Supply Voltage/CHMSL (center high mounted stop lamp)
Cruise Set/Coast Signal - This is a momentary switch signal which sends 12v+ down this wire. Momentary meaning, it only sends 12v+ when the switch is pressed, when you release the switch, it should turn off. Pressing this switch quickly will set the current speed and it will be maintained. Holding it on will let vehicle coast, when you release, that will be the new set speed to be maintained. After set, each quick press of the switch will lower set speed 1 mph.
Cruise On Signal - This is simply an on / off switch that enables or disables the cruise function. This needs to be switched 12v+ to this wire.
Cruise Resume/Accel Signal - This is a momentary switch signal which sends 12v+ down this wire. Momentary meaning, it only sends 12v+ when the switch is pressed, when you release the switch, it should turn off. This switch ONLY functions after you have previously pressed the SET/COAST switch. Resume will resume vehicle speed after hitting the brakes. Holding this switch will make vehicle accelerate until you release it. Each quick press of the switch will increase set speed 1 mph.
Stop Lamp Supply Voltage - This wire should be hooked to the same wire that feeds you're brake lights 12v+ when you press on the brake pedal. THIS IS NOT THE SAME WIRE AS TCC BRAKE SWITCH THAT THE ECM USES TO UNLOCK TORQUE CONVERTER.
After those are wired, you also MUST have the TCC brake switch signal to the ECM. If this signal is not received by the ECM, cruise will not function. TCC Brake Switch Signal is 12v+ when brakes are NOT pressed, and the switch OPENS when you hit the brakes. This signal wire is located with the VSS Signal, Tach, MIL, etc. in the harness and labeled “TCC Brake” - Purple wire.