Key-P function - GF27.10-P-3028GGA

TRANSMISSION 722.902 in MODEL 463.306/336/346 up to 31.5.12 as of Model Year 2011/YoM 10 

TRANSMISSION 722.904 in MODEL 463.202/222/236/237 up to 31.5.12 as of Model Year 2009/YoM 08 

TRANSMISSION 722.902 in MODEL 463.303/340/341 up to 31.5.12 as of Model Year 2009/YoM 08 

Key-P function requirements, general 

• Circuit 15 On
• Brake pedal operated
• Vehicle speed v > 8 km/h

Key-P, general 

The designation Key-P comprises all the functions which in addition to the parking brake serve to secure the vehicle to prevent it from rolling away unintentionally.

Key-P function sequence 

The function sequence is subdivided into the following steps:

• Park pawl 
• Locking ignition switch 
• Locking of selector lever position "P" 

Park pawl 

The park pawl only allows the transmission to be shifted out of selector lever position "P" by the electronic selector lever module control unit, when the transmitter key is turned to the "Circuit 15 ON" position and the brake pedal is pressed.

To ensure that after the vehicle has been parked, the selector lever is in the selector lever position "P" or that it can be moved to this position, the transmitter key can only be turned to "0" in this direction and removed from the EZS control unit. The vehicle is secured mechanically by blocking the park pawl gear in the transmission.

In the event of mechanical or electrical fault, selector lever position "P" can be released manually.

Locking ignition switch 

The EIS [EZS] control unit locks the transmitter key mechanically at a vehicle speed of >8 km/h.

This prevents the transmitter key from being removed.

Locking of selector lever position "P" 

The selector lever remains locked in position "P" if the following conditions are not met:

• No enable signal from the drive authorization system (DAS 3)
• Brake pedal not actuated

	Component description for instrument cluster	A1	GF54.30-P-6000G
	Component description for electronic selector lever module control unit	N15/5	GF27.60-P-5163GGA
	Component description for ESP control unit	N30/4	GF42.45-P-5118G
	Electronic ignition/starter switch control unit (EZS), component description	N73	GF80.57-P-6000G