Warning lights abs,TC and tpms

[Tomspolo]

Hello,

New here and need some info...

My son has a 6r polo 1.6 TDI 13 plate

We are in the process of getting the wheels refurb'd, currently the std 17 inch wheels are on the front, but have borrowed some 15 inch rims to put on the back for a couple of days. On going for about 1/4 mile down the road, the abs, traction control light (yellow skidding car icon) and tyre pressure warning lights came on......

Is this to do with the wrong size wheels on the back?

Btw...it was all okay when the smaller rims were on the front....no warnings

[RUM4MO]

Having different rolling radius at each end will confuse the ABS module and that feeds the TC and the TPMS, so yes, not surprising really.