Symptom Related Diagnostic Procedures

NOTE: Except for manual unlocking and locking of the convertible top, the opening and closing processes must take place automatically. Pressing a button in the centre console causes the drive elements to execute the preselected motion. Various micro-switches ensure that these processes take place smoothly.

The motor is activated only if the following conditions are met:
- no speedometer signals greater than 5 km/h,
- electric motor plug connection is plugged in,
- terminal 15 connected via ignition lock,
- fuse B 6 (row B, number 6) and fuse D 3 (row D, number 3) are OK,
- parking brake is engaged.

The vehicle must be on a horizontal surface and there must not be any defect in the convertible top actuating mechanism.


Troubleshooting:






The control relay (double relay) is located at sockets 14 and 15 on relay carrier 1 in the footwell.

Terminal designation on the relay carrier from the bottom side of the control relay.


Troubleshooting on the relay carrier






NOTE: Control relay pulled off. Terminal designation on the relay carrier (Figure 596_97) is from the bottom side of the control relay.


1. Connect measuring instrument (voltmeter) to terminal 22 (ground) and terminal 23 (positive 30) on the carrier plate.
Display = battery voltage
2. Connect measuring instrument to terminal 22 (ground) and terminal 26. Switch on ignition.
Display = battery voltage
3. Connect measuring instrument to terminal 23 (positive) and terminal 15 (parking brake engaged).
Display = battery voltage
4. Connect measuring instrument to terminal 23 and terminal 16 ("close convertible top" button). Press "close" button.
Display = battery voltage
5. Connect measuring instrument to terminal 23 and terminal 17 ("open convertible top" button). Press "open" button.
Display = battery voltage
6. Convertible top locked. Connect measuring instrument to terminal 23 and terminal 14 (cowl panel frame micro-switch).
Display = battery voltage
7. Convertible top locked. Connect measuring instrument to terminal 23 and terminal 29 (B-pillar micro-switch).
Display = battery voltage
8. Convertible top unlocked. Connect measuring instrument to terminal 23 and terminal 13 (micro-switch closed, convertible top compartment lid CTCL open).
Display = battery voltage
9. Convertible top unlocked. Connect measuring instrument to terminal 23 and terminal 19 (cowl panel frame micro-switch).
Display = battery voltage
Plug control relay onto relay carrier. Open convertible top compartment lid and pull off electrical plug connection on the convertible top drive motor.
10. Connect positive lead of measuring instrument to terminal 1 (black wire) and negative lead of measuring instrument to terminal 4 (green wire). Use an auxiliary lead to jumper terminal 2 and terminal 3 at the plug connection. Switch on ignition and press "Open" button.
Display = battery voltage
11. Connect positive lead of measuring instrument to terminal 4 (green wire) and negative lead of measuring instrument to terminal 1 (black wire). Use an auxiliary lead to jumper terminal 2 and terminal 3. Switch on ignition and press "Close" button.
Display = battery voltage

Installation overview of convertible top micro-switches






Locking/unlocking micro-switch

The micro-switch for locking/unlocking is located behind the locking hook holder.






Parking brake micro-switch

The electrical plug connection is located below the parking-brake lever behind the left centre cover. The micro-switch is clipped into the parking brake lever console.






B-pillar micro-switch

The micro-switch is located behind the left side-panel lining.






Convertible top compartment lid micro-switch

The micro-switch is riveted onto the drive-motor bracket. The drive motor with bracket can be removed by unscrewing the three M6 fastening nuts


NOTE: If it is not possible to open the convertible top compartment lid electrically (convertible top open), carefully press the ball socket of the push-bar springs (left and right) out of the ball head of the drive lever.

Manually open the convertible top compartment lid and remove the drive motor.

If the convertible top is closed, the drive motor can be removed from the inside by taking out the cover for the convertible top rest.