Activate the cruise control automatically when starting the car. This is installed on a SG9 MY03 XS manual.
How it works: The cruise can be activated by pressing the switch a few seconds after the ignition is activated, and then any time while the ignition is active, including while starting the car. This was surprising, I thought it would only be while the engine was running or would reset while starting the engine.
Using a relay and other bits to create a momentary action switch from a constant supply. Use the ‘start’ wire to provide power to the ‘switch’ and activate the cruise when starting the car. Control switch still works as normal at any time.
Note that this momentary relay will not reset for 10secs or so after the activate 12v is removed.
Parts needed:
Relay, Capacitor, (I used 470uF. A different capacitor value will change the length of time the switch is active for), Resistor (about 10k ohm, different value will change the switch reset time), Diode (1N4004), Wire, Insulation.
Tools:
Screwdriver, soldering iron, wire cutters/strippers.
Step 1:
Remove the lower cover off the steering column. One screw and it’s held together by clips
Step 2:
Remove the trim panel under the dash 2 screws at lower corners then a few clips around the top.
Step 3:
Disconnect the cruise switch to make it easier to get at the wires.
Step 4:
Wire up the momentary switch as the circuit diagram below
here is a pic of my dodgy soldering effort
Step 5:
Wire it in (I used alligator clip leads to test everything first including listening for the relay activating when the start kicked in before joining it to the cruise switch)
Solder the activate wire to the ‘start’ position on the ignition barrel (pink wire)
Solder the relay contacts to the cruise switch wires, green/black and green/blue (found some matching wires in my junk pile)
Connect the earth to the car (black wire). I used the bolts above the fuse panel and a crimped terminal, the bolts were convenient and the nut was actually loose and ready to go
edit: apparently the black Cruise Control wire is an earth - use that instead
Step 6:
Test it
Step 7:
Insulate all wiring, tape up the relay to stop it flopping around.
Step 8:
Put everything back together
Step 9:
Cruise with control.
Note: If you start the car too quickly the cruise control may be locked out until IGN off. So key in, IGN, pause for a few secs (while I put seatbelt on), then start.
If you stall the car, and then re-start, CC will go off, but if it hasn't been locked out then press the switch, it works as normal.