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When the kick-down switch (S16/6) is operated via the accelerator pedal a signal is passed on to the ETC 
control module (N15/3). Based on this information the ETC control module (N15/3) actuates the solenoid 
valves so that the upshifts and downshifts take place at higher engine speed.  
Shift-Lock Function 
Operation 
The term shift lock combines the functions which, in addition to the parking brake, offer an additional safeguard 
for the vehicle to prevent it moving off unintentionally. 
These include the functions of locking the selector lever position "P" and locking the ignition lock as well as the 
parking lock in the transmission. 
The shift lock function only allows shifting out of selector lever position "P" if the transmitter key (A8/1) has 
been turned into the position "Ignition: ON" and the brake pedal is depressed. 
In order to ensure that after parking the vehicle the selector lever is shifted into selector lever position "P", the 
transmitter key (A8/1) can only be turned towards "0" in this position and removed from the EZS control 
module (N73) (ignition lock locking, function). 
The vehicle is secured mechanically by blocking the park pawl gear. 
In the event of mechanical or electrical/electronic faults it is possible to unlock selector lever position "P" 
manually (shift lock override function). 
Function Of Locking Of Selector Lever Position "P" 
 
See FUNCTION OF LOCKING OF SELECTOR LEVER POSITION "P"
. 
Ignition Lock Locking, Function 
 
See IGNITION LOCK INTERLOCK
. 
Function Of Shift Lock Override 
 
See FUNCTION OF SHIFT LOCK OVERRIDE
.  
Function Of Locking Of Selector Lever Position "P" (With Touch Shift) 
Operation 
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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Fig. 162: Function Of Locking Of Selector Lever Position "P" 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 
One of the functions of the shift lock is to lock the selector lever in position "P". The selector lever is locked 
electronically. See Fig. 162
. 
The selector lever remains disabled in position "P", if the brake is not operated or there is no power supply to 
the electronic selector lever module control module (N15/5) (circuit 87). 
The electronic selector lever module control module (N15/5) actuates the R/P lock solenoid valve (89) from the 
 
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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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ignition key position Ignition "ON" when the brake pedal is depressed and therefore when the brake lamp 
switch (S9/1) is actuated and when selector lever position "P" is recognized. 
The R/P locking magnet (89) releases the selector lever thus allowing the selector lever to be moved away from 
position "P". 
Parking Lock, Location/Task/Design/Function - See PARK PAWL, 
LOCATION/TASK/DESIGN/FUNCTION. 
Ignition Lock Interlock 
Operation 
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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Fig. 163: Ignition Lock Interlock 
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662  
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        Page 1461 of 4133

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
The mechanism of the ignition lock interlock connects the selector lever of the floor shift with the ETC control 
module (N73). See Fig. 163
. It prevents the transmitter key (A8/1) from being withdrawn when the selector 
lever is not at position "P". 
When the parking lock is not engaged (selector lever position "D", "R", "N"), the locking valve (60) locks the 
locking cam (61). The compression spring (62) only pulls the locking valve (60) away from the locking cam 
(61) in selector lever position "P". The transmitter key (A8/1) can now be turned to position "0" and removed 
from the ignition. 
Parking Lock, Location/Task/Design/Function 
 
See PARK PAWL, LOCATION/TASK/DESIGN/FUNCTION
.  
Function Of Shift lock Override 
Transmission with touch shift 722.6 in MODEL 163 
Operation 
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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Fig. 164: Function Of Shift Lock Override 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 
If it is not possible to engage a drive position from selector lever position "P" due to a mechanical or 
electrical/electronic fault, the selector lever position "P" lock can be released using the shift lock override 
function. See Fig. 164
. 
To do this a suitable tool must be guided through the flap (95) onto the web (90a) and the web pressed gently 
downwards (arrow). The lock lever (90) releases the selector lever. The selector lever can be moved from 
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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        Page 1463 of 4133
position "P" by simultaneously operating the lock lever.
Location/Task/Design/Function Of R/P Lock 
 
See LOCATION/TASK/DESIGN/FUNCTION OF R/P LOCK
. 
Parking Lock, Location/Task/Design/Function 
 
See PARK PAWL, LOCATION/TASK/DESIGN/FUNCTION
.  
Function Of Torque Converter Lockup Clutch Control 
Operation 
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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Fig. 165: Function Of Torque Converter Lockup Clutch Control 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
 
2001 Mercedes-Benz ML320 
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662  
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