Running rough after stereo install

[Kss0x00]

I recently installed an after market (Chinese 7010b) stereo in my girlfriends 09 yaris which now seems to be idling a little rough and she says the steering is randomly "really tight"/ hard to turn the wheel. I wired the stereo according to the diagram, but there was a third connector plugged into the back of the OEM stereo that I can't find reference to anywhere (connector had 5 wires of about 20 possible openings for wires) that i just left disconnected. Car is manual transmission if that matters.

Is there anything related to the stereo that would cause these issues? Or does anyone have any troubleshooting ideas?

TIA

[WeeYari]

Did you have the battery disconnected while doing the install?

[Kss0x00]

Yes the battery was disconnected. The instructions said to disconnect the negative terminal, but I completely disconnected it.

[WeeYari]

In that case, the ECU must go through a relearning process to restore fuel and engine management settings. This requires nothing more than driving the vehicle. Eventually it will settle down to normal operation.

[ern-diz]

Wondering if grounding is an issue. When it is, the steering issue you described can be present...

[remcafee]

alternator could of gotten a little weaker with the stereo install

[Leegamer]

Wondering if grounding is an issue. When it is, the steering issue you described can be present...

I had a similar issue with my steering, it would get really tight as you approach lock and I finally noticed once I hit full lock the car would start to cut off for a second. The car was also running more and more rough.

When I started looking into it I had a lot of corrosion on the battery terminals. I cleaned them thoroughly and resolved both issues immediately.

[_S7V7N_]

I have an 07 Sedan, manual transmission, same idle issue happens to me when I disconnect my battery, usually fixes up after a few hours, just drive cautiously, the car could turn off on you till the computer resets itself