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

TRANSMISSION 722.9 in MODEL 216.3 as of model year 2009 

/ YoM 08 

TRANSMISSION 722.9 in MODEL 216.3 (except 216.374) as of Model Year 2011 

/YoM 10 model refinement package 

TRANSMISSION 722.9 in MODEL 221.0 as of model year 2009 

/ YoM 08 

TRANSMISSION 722.9 in MODEL 221.0 (except 221.095) 

TRANSMISSION 722.9 in MODEL 221.0 (except 221.074) as of Model Year 2011 

/YoM 10 

TRANSMISSION 722.9 in MODEL 221.1 as of model year 2009 

/ YoM 08 

TRANSMISSION 722.9 in MODEL 221.1 (except 221.195) 

TRANSMISSION 722.9 in MODEL 221.1 (except 221.174) as of Model Year 2011 

/YoM 10 

Key-P function requirements, general 

• Circuit 15 ON
• Brake pedal operated
• Vehicle speed > 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 function sequence 
• Ignition-lock lock function sequence 
• Selector lever position "P" lock function sequence 
• Emergency-P function sequence (see document, Emergency-P function) 

Park pawl function sequence 

The park pawl only permits shifting out of selector lever position "P" by the gear selector switch DIRECT SELECT (S16/13) when the transmitter key (A8/1) is in position "circuit 15 ON" and the brake pedal is operated.

In order to ensure that after parking the vehicle the selector lever is automatically shifted into selector lever position "P" by the intelligent servo module for DIRECT SELECT (A80), the transmitter key can only be turned towards "0" and removed from the ignition lock in this position. The vehicle is secured mechanically by blocking the park pawl gear in the transmission.

With code (889) Keyless-Go 

On vehicles with Keyless Go, selector lever position "P" is engaged when the driver door is opened after the vehicle is parked.

Ignition-lock lock function sequence 

The electronic ignition lock manually locks the transmitter key at a vehicle speed >8 km/h.

It prevents the transmitter key from being removed because automatic engagement of selector lever position "P" cannot be performed by the intelligent servo module.

The transmitter key can be removed as long as the vehicle speed remains below the speed threshold and selector lever position "P" or "N" is automatically engaged by the intelligent servo module.

Selector lever position "P" lock function sequence 

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

• No power supply from intelligent servo module
• No enable from drive authorization system
• Brake pedal not actuated

	Electrical function schematic Key-P	Model 216	PE27.19-P-2058-97CAB
		Model 221	PE27.19-P-2058-97SAC
	Emergency-P function		GF27.10-P-3029AHS
	Overview of system components for automatic transmission (AT)		GF27.10-P-9992AHS