Nominal Values

Nominal Values

With the ignition switched on
Supply voltage 11.5 to 13.5 volts

Pot. 1, convertible top
The values between pot. 1, calibration value 1, and pot. 1, calibration value 6, are calculated as percentage by the convertible-top control module.
If the actual values (measured values) of calibration values 1 and 6 differ, the convertible-top potentiometer must be replaced.

- Pot. 1 calibration value 1 Tester display must be less than [<] 1.6 volts
- Pot. 1 calibration value 2
- Pot. 1 calibration value 3
- Pot. 1 calibration value 4
- Pot. 1 calibration value 5
- Pot. 1 calibration value 6 Tester display must be greater than [>] 3.0 volts

Voltage measurement of convertible-top potentiometer

Switch on the ignition and measure voltage with test adapters 9619 and 9636 and the pin template 9636 and measure row 1, pins 12 and 21, with the voltmeter. Nominal value 0.4 - 4.4 volts.

Pot. 2, convertible-top compartment lid
The values between pot. 2, calibration value 2, and pot. 1, calibration value 4, are calculated as percentage by the convertible-top control module.

If the actual values (measured values) of calibration values 1 and 4 differ, the CTCL potentiometer must be adjusted.

- Pot. 2 calibration value 1 Tester display must be greater than [>] 1.0 volts
- Pot. 2 calibration value 2
- Pot. 2 calibration value 3
- Pot. 2 calibration value 4 Tester display must be less than [<] 3.9 volts [<] 3.9 volts

Voltage measurement of convertible-top compartment potentiometer

Switch on the ignition and measure voltage with test adapters 9619 and 9636 and the pin template 9636 and measure row 3, pins 1 and 3, with the voltmeter. Nominal value 0.5 - 4.4 volts.

Test point 1
Switch position implausible

Fault code 01
This fault is only stored in the memory when operation has taken place (button or comfort function with the key).

1. Check response of micro-switches of rear section flaps left and right.
A defective micro-switch must be replaced.

2. Check response of micro-switch in convertible-top latch.
If the micro-switch is defective, replace the convertible-top latch.

Test point 2
Button short to ground

Fault code 02
1. Check pin 1 to pin 4 for continuity (bitmap on "close" switch), check button pin 2 to pin 4 for continuity (bitmap on "open" switch).
2. Measure resistance of wires 1 and 2 to one another with the ohmmeter. Display 1.8 - 2.0 kOhms

Test point 3
Convertible-top pot. fault

Fault code 03
This fault is only stored in the memory if the voltage at the input of the convertible-top potentiometer exceeds or falls below the operating range.

1. Switch ignition off and remove ignition key. With test adapter 9619, 9636 and pin template 9636, measure the resistance of the convertible-top potentiometer at row 1, pins 12, 21 and 24 with the ohmmeter. If the display Infinity Ohm appears, the convertible-top potentiometer must be replaced.

2. Switch on the ignition and measure at row 1, pins 12 and 21, with the voltmeter; nominal value (display) 0.4 - 4.4 volts.
If there is no voltage display, replace the control module.

3. Calibrate the convertible top

Test point 4
CTCL pot. fault

Fault code 04
This fault is only stored in the memory if the voltage at the input of the convertible-top compartment lid potentiometer exceeds or falls below the operating range.

1. Switch ignition off and remove ignition key. With test adapter 9619, 9636 and pin template 9636, measure the resistance of the convertible-top compartment lid potentiometer at row 1, pins 1, 3 and 5 with the ohmmeter. If the display Infinity Ohms appears, the potentiometer and drive motor must be replaced.

2. Switch on the ignition and measure at row 3, pins 1 and 3, with the voltmeter; nominal value (display) 0,5 - 4.4 volts.
If there is no voltage display, replace the control module.

3. Calibrate the convertible top

Test point 5
Timeout error

Fault code 05
This fault is only stored in the memory if an electric motor is actuated and does not reach the limit position within 6 seconds, or the potentiometers of the convertible top and CTCL do not show any change in voltage within 3 seconds.

1. Check whether the valve screw of the hydraulic pump is closed.

To check the micro-switch input signals, select the input signals which appear in the menu: Latch locked, Latch unlocked, Convertible top, Convertible-top compartment lid side flaps, Latching hook. Actuate the micro-switch manually (press it) to read the response in the bitmap positions of the tester display.

If the convertible top is between "Convertible top closed" and "Convertible top forward" and if the "Convertible top raised" input is connected to ground (contact for micro-switch of convertible-top latch does not lie against the top edge of the cowl panel and does not switch), examine the tension of the convertible-top covering using the left and right tension cables or, if necessary, loosen by 1 or 2 turns so that the contact lies against the top edge of the cowl panel and switches.

If the convertible top is in the forward position (diagram) on closing, check the response of the micro-switch - unlocked or not unlocked (small diagram) - in the convertible-top latch.
If the micro-switch is defective, replace the convertible-top latch.

If the convertible top is in the rear position (diagram) on opening, check the response of the micro-switch - unlocked or not unlocked (small diagram) - in the convertible-top latch.
If the micro-switch is defective, replace the convertible-top latch.

If the convertible top is in the centre front position (diagram) on closing, check the response of the micro-switch - not locked or locked (small diagram) - in the convertible-top latch.
If the micro-switch is defective, replace the convertible-top latch.

If the convertible top is in the centre rear position (diagram) on opening, check the response of the micro-switch - not locked or locked (small diagram) - in the convertible-top latch.
If the micro-switch is defective, replace the convertible-top latch.

If the convertible top is in the closed position (diagram) and the latching hook has been actuated, check the response of the convertible top (CTCL) micro-switch or adjust the Bowden cable of the central locking hook in such a way that the micro-switch switches.
A defective micro-switch must be replaced.

If the convertible top remains in a position not described here:

6. Switch ignition off and remove ignition key. With test adapter 9619, 9636 and pin template 9636, measure the resistance of the convertible-top compartment lid potentiometer at row 3, pins 1, 3 and 5 with the ohmmeter. If the display Infinity Ohm appears, the potentiometer and drive motor must be replaced.

7. Switch ignition off and remove ignition key. With test adapter 9619, 9636 and pin template 9636, measure the resistance of the convertible-top potentiometer at row 1, pins 12, 21 and 24 with the ohmmeter. If the display Infinity Ohm appears, the convertible-top potentiometer must be replaced.

Test point 6
Calibration necessary

Fault code 06
This fault is stored in the memory after 1000 actuations or if fault code 03, convertible-top pot. fault, or fault code 04, CTCL pot. fault, is entered.
1. Read out and delete actuation counter 2.
2. A newly installed control module has not been calibrated.
3. Proceed as described in test points 3 or 4.
4. Calibrate the convertible top

Test point 7
Supply voltage

Fault code 07
1. Check the battery or alternator.
2. Inspect the plug connection on the control module for corrosion.