Component Tests and General Diagnostics

54 34 001 Checking Function Of Electro-hydraulic Soft Top







WARNING: You are exposed to the risk of trapping body parts when working on the installed or removed soft top.







Soft top is centred by pin (2) during insertion into guide and locked by rotary striker (1).
Carefully close soft top until rotary striker (1) has retracted by approx. 1/3 into striker.
Rotary striker (1) and pin (2) must close correctly and virtually silently.
Open and close soft top at least 3 times.
Check all line connections for fluid leaks.
If necessary, check fluid level.







NOTE:
- The drive has an additional function.
- With the hardtop opened, the drive locks the hardtop on the base plate in the rear module.
- The purpose of this function is crash locking.
- In the event of a crash, the stored hardtop cannot fold forwards.

Function actuation, soft top:







Closing soft top is only possible under following conditions:
- from ignition lock position "R" (radio setting)
- outside temperature is above -20 °C
- rear lid (rear module) closed
- vehicle stationary (driving speed 0 kph)
- luggage compartment partition is in lower position
- lateral inclination of the vehicle less than 11°
- power windows are initialized
- battery voltage greater than 11.5 volts
- fewer than 5 opening and closing operations in succession (pump protection inactive)
- temperature of hydraulic fluid for opening max. 90 °C and for closing max. 105 °C
- hydraulic pump motor is not overheated
- control switch is pressed

Automatic opening runs as follows:
- Side windows are lowered
- Unlock hardtop at the cowl panel
- Switch off heated rear window (via the junction box electronics)
- Unlock and open rear module
- Pack rear roof shell on front roof shell
- Store roof panel package in the rear module and lock
- Close and lock rear module
- Close side windows







Check control messages
It is not possible to open and close the soft top in certain situations.
Corresponding Check Control messages are displayed in the instrument cluster for this purpose.
The Check Control messages serve to explain in closer detail the red or yellow LED on the button which lights up in the event of a fault.












Only when you have excluded the function conditions as fault sources can you start soft top diagnosis.