Steering: turn the steering wheel to its maximum deflection in either direction and hold; press the ST trim + or - buttons to increase or decrease the steering rate. If the steering is unresponsive, keep pressing the steering trim+ button while holding the steering wheel at maximum deflection.
Throttle: with the car inverted (Wheels not touching the ground), press the throttle trigger down to its maximum position and hold; press the TH trim + or - buttons to increase or decrease the throttle rate. If the throttle is unresponsive, keep pressing the throttle trim + button while holding the throttle trigger down at its maximum point.