Cayman gt4 servicing and tyres opc

[HighwayStar]

KOKSRACING said:

Car passed with no issues even the tyres were fine. 11k on the original tyres and 3mm tred left isn’t bad

One question was the ctek. I wired that to the front battery so I could use the connectors quickly but Porsche say it needs to be wired to the battery control unit.

Any ideas what that is and where it is?

Live to the +ve battery, negative to the spare bolt hole on the suspension post. The battery control unit is then in-play.