Can we do this? (aka The DIY Cruise Control Thread)

[nickhjort]

Ok...so the first test didn't go so hot. I have some pics...
















So I started the car and the airbag light was on...duh...I don't have the passenger side plugged in. I pulled out the driveway nice and easy so as not to tip over my speedometer. I hit 40mph and press that "on" button...pop! There goes a fuse and all my dash lights start coming on and the "cool" light is blinking, and the car is boggin down. It didn't stall, but it wouldn't go faster. SO I pulled over and started checking fuses. My 7.5A Ignition fuse blew. Now I'm not sure if something crossed or what. I checked and double checked all my connections. Not bare wires, nothin'. I changed the fuse and everything was fine...safe to say I didn't try testing it again on the way home :)

Here's what I did:
I tapped the #40 pin on the ECM connector "A21" and ran the wire through the firewall and spliced it with the red wire from the switch setup.
Then I took a jumper...with a fuse... and jumped from the blue wire CTScott showed me in the engine compartment fuse box, but the white wire wasn't where it should be, but it was just to ground it. So I jumped it to another white wire that grounded (according to my multimeter touching the white wire and the frame...0 resistance) Anyway, I have no idea why it tripped the ingnition fuse. Please help me with any ideas. I hope i didn't fcuk up the ECM by blowing the fuse. Everything seemed perfectly fine when I replaced it. HELP! :(

[CTScott]

Originally Posted by nickhjort

Ok...so the first test didn't go so hot. I have some pics...

So I started the car and the airbag light was on...duh...I don't have the passenger side plugged in. I pulled out the driveway nice and easy so as not to tip over my speedometer. I hit 40mph and press that "on" button...pop! There goes a fuse and all my dash lights start coming on and the "cool" light is blinking, and the car is boggin down. It didn't stall, but it wouldn't go faster. SO I pulled over and started checking fuses. My 7.5A Ignition fuse blew. Now I'm not sure if something crossed or what. I checked and double checked all my connections. Not bare wires, nothin'. I changed the fuse and everything was fine...safe to say I didn't try testing it again on the way home :)

Here's what I did:
I tapped the #40 pin on the ECM connector "A21" and ran the wire through the firewall and spliced it with the red wire from the switch setup.
Then I took a jumper...with a fuse... and jumped from the blue wire CTScott showed me in the engine compartment fuse box, but the white wire wasn't where it should be, but it was just to ground it. So I jumped it to another white wire that grounded (according to my multimeter touching the white wire and the frame...0 resistance) Anyway, I have no idea why it tripped the ingnition fuse. Please help me with any ideas. I hope i didn't fcuk up the ECM by blowing the fuse. Everything seemed perfectly fine when I replaced it. HELP! :(

I think your in the wrong pin on the ECU:


This is the Wire harness side view looking into the connector from the pins:


I think you're mirror imaged across the center divider:

[Sir A.Y. Atoyot]

Originally Posted by nickhjort

Ok...so the first test didn't go so hot. I have some pics...


So I started the car and the airbag light was on...duh...I don't have the passenger side plugged in. I pulled out the driveway nice and easy so as not to tip over my speedometer. I hit 40mph and press that "on" button...pop! There goes a fuse and all my dash lights start coming on and the "cool" light is blinking, and the car is boggin down. It didn't stall, but it wouldn't go faster. SO I pulled over and started checking fuses. My 7.5A Ignition fuse blew. Now I'm not sure if something crossed or what. I checked and double checked all my connections. Not bare wires, nothin'. I changed the fuse and everything was fine...safe to say I didn't try testing it again on the way home :)

Here's what I did:
I tapped the #40 pin on the ECM connector "A21" and ran the wire through the firewall and spliced it with the red wire from the switch setup.
Then I took a jumper...with a fuse... and jumped from the blue wire CTScott showed me in the engine compartment fuse box, but the white wire wasn't where it should be, but it was just to ground it. So I jumped it to another white wire that grounded (according to my multimeter touching the white wire and the frame...0 resistance) Anyway, I have no idea why it tripped the ingnition fuse. Please help me with any ideas. I hope i didn't fcuk up the ECM by blowing the fuse. Everything seemed perfectly fine when I replaced it. HELP! :(

I think that you identified #40 correctly on your first picture, but got turned around somehow with the plug - I could be wrong, but I think that you inserted your jumper in #29.

[nickhjort]

Yes, yes people it's all coming together now. I did get turned around and had it in pin 29, not pin 40. I couldn't wait till tomorrow, got my flash light and just cruised the town without touching the gas pedal :) It works! I did test the button just before I left, and the fuse didn't pop. So my second road test was a success. Thank you all for your help and if anyone else with the 07 liftback is gunna do this I can try to help as much as I can. Running wires all the way to the ECM is a pain in the arse, but it's totally worth it. If anyone needs anymore pictures let me know and I'll try to take them tomorrow.

All I need to do now is find out a way to make my LED light up when it's on. And run wires for the clutch switch which I will be buying later this week. Any input on that would be greatly appreciated.

[Sir A.Y. Atoyot]

Originally Posted by nickhjort

Yes, yes people it's all coming together now. I did get turned around and had it in pin 29, not pin 40. I couldn't wait till tomorrow, got my flash light and just cruised the town without touching the gas pedal :) It works! I did test the button just before I left, and the fuse didn't pop. So my second road test was a success. Thank you all for your help and if anyone else with the 07 liftback is gunna do this I can try to help as much as I can. Running wires all the way to the ECM is a pain in the arse, but it's totally worth it. If anyone needs anymore pictures let me know and I'll try to take them tomorrow.

All I need to do now is find out a way to make my LED light up when it's on. And run wires for the clutch switch which I will be buying later this week. Any input on that would be greatly appreciated.

Thanks for being the guinea pig - this will certainly help me install in my '08.