LI77.30-P-055304

Soft top does open or close completely
Topic number
LI77.30-P-055304
Version
1
Design group
77.30 Vario roof, soft top - complete
Date
03-19-2013
Validity
MODEL 197.477
Reason for change
Part number updated
Reason for block
Complaint:
Soft top inoperative and additional message in multifunction display "Fully open/close soft top".
The stored fault codes indicate a short circuit in the limit switches.
Cause:
Gearing of locking motor at soft top lock is defective
Remedy:
Open soft top lock with the aid of Xentry Diagnostics. Select VDS soft top control (N52) and actuate the soft top lock
with the appropriate soft top lock/open button.
Then check actual value "Soft top lock limit switch", "Lock actuation element open sensor (S84/7)" or "Lock actuation
element closed sensor (S84/8)".
Note: The soft top control can only be operated via the soft top switch when the "Lock actuation element open sensor
(S84/7)" is actuated.
If it is not possible to actuate the soft top lock, the soft top can be opened by an emergency release sequence. To do
this, proceed as follows:
If the front roof bow trim is installed:
1. Remove plastic cap from front roof bow trim
2. Fit a size 6 Allen wrench at least 50 mm long and carefully press upwards approx. 5 mm until the cam plate of the
control rods is free (the drive shaft of the motor is pressed upwards against spring force)
3. Open lock (turn clockwise)
4. Open soft top 20-30 cm
Note: Check functionality of hall sensor by using another magnet (preferably larger than one installed). If the sensor
is NOK, proceed with #5. If sensor is OK, please stop and consult with MB technical team via PTSS.
5. Remove front roof bow trim
03-19-2013 7:33 PM
© Copyright Daimler AG
CLANTZ4
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6. Remove control rods from cam (mark them beforehand so that the ball heads are not confused when installing the
control rods!)
7. Unscrew motor and replace.
8. Install in the reverse order.
Symptoms
Body / Roof system / Convertible top/vario roof / Convertible top / Does not open
Body / Roof system / Convertible top/vario roof / Convertible top / Does not close
Control unit/fault code
Control unit
Fault code
Fault text
VDS - Soft top control (N52)
(CRCM197)
B25D812
Limit switch "Actuator motor for soft top lock OPEN" has a malfunction. There is a short circuit to positive.
VDS - Soft top control (N52)
(CRCM197)
B25DC12
Limit switch "Actuator motor for soft top lock LOCKED" has a malfunction. There is a short circuit to positive.
VDS - Soft top control (N52)
(CRCM197)
B25DB12
Limit switch "Soft top compartment CLOSED" has a malfunction.
There is a short circuit to positive.
VDS - Soft top control (N52)
(CRCM197)
B25D712
Limit switch "Right soft top lock CLOSED" has a malfunction.
There is a short circuit to positive.
VDS - Soft top control (N52)
(CRCM197)
B25D612
Limit switch "Left soft top lock CLOSED" has a malfunction. There is a short circuit to positive.
VDS - Soft top control (N52)
(CRCM197)
B25D811
Limit switch "Actuator motor for soft top lock OPEN" has a malfunction. There is a short circuit to ground.
Parts
Part number
ES1 ES2 Designation
A 197 776 01 64
Quantity Note
Soft top lock
EPC Other
make
part
1
X
Work units
Op. no.
Operation text
Time
Damage
code
Note
7700R D6
Validity
Vehicle
Engine
Transmission
197.477
*
*
03-19-2013 7:33 PM
© Copyright Daimler AG
CLANTZ4
Page 2/3
Full model designation breakdown
Vehicle
Engine
Transmission
197.477
159.980
700.400
03-19-2013 7:33 PM
© Copyright Daimler AG
CLANTZ4
Page 3/3