Greetings!

A few years back a mechanic did an A/T to Manual Swap, at the moment, the speedometer wast working due to some explanation he gave me that now doesn't really matter..
To what I know, I still have the A/T ECU and harness.

Well, a few weeks ago I replaced the old stock radio for a 2Din android stereo, and it's nice, but I haven been able to install the reverse camera, because I don't have my reverse lights wired to activate when, you know, reversing.
Soooo... I started to investigate and noticed the reverse switch harness with its cables cut off about 3 inches, so, according to a few guides on several forums, on the reverse switch I grounded the yellow wire, and the green wire I routed it to under the glove compartment, then I cut the white cable from the reverse light relay, and joined the together (green + white), testing it, I could hear the relay activation, but no reverse lights coming up, o grabbed my multimeter and checked voltage, but nothing came up, so, thinking the white cable might've been the problem i tried different combinations of the cables in that specific relay, and now, the gauges in the instrument cluster won't work anymore, and I have a code P0600 with an OBII scanner... All the lights come up, but no gauge reading.
I checked the fuses, they're all good, I don't want it to be the damn ECU that went to s&$i7...

Any advise? I'm almost a noob on these type of things, I can do slot of stuff with computers, but cars are a little bit hard for me :p

Any and all help will be appreciated.

Update:
After looking up the code online, I rewired 2 grounds using 16 gauge cable and the code went away. Cluster still not working, might 've been damaged by a short, might need to remove it to check it up.

Best regards!

 

You'll have to educate yourself , Taking on a project like that if you're a noobee will be a learning experience for sure and you may be over your head

 

Yeah.... I did notice, not a complete newbie as I have some experience in basic electronic stuff as I'm pretty well versed in computers.

Any ways, a coworker came over to my house and helped me check it all over, what I did was correctly installed, the problem was that a wire from the harness was broken somewhere on the way back to the reverse lights and that was why my lights didn't came up even though I had the wiring correctly, and while trying to diagnose that I blew up a fuse... And didn't notice, that's why the gauges stoped working lol

Anyways. All is good now.

 

Good to hear , The best thing is to keep your head and don't get flustered . Auto electronics can throw you a curve ball at times