Convertible Top: Description and Operation: Overview
Overview
General
The control module has a built-in diagnostic system, Volvo on-board diagnostic (OBD) system II, which continuously monitors itself and its input and output signals. The control module designation is the convertible control unit.
Diagnostic trouble codes (DTCs)
The control module will store a diagnostic trouble code (DTC) if it detects a fault. The control module can store up to 34 diagnostic trouble codes (DTCs).
If for some reason a fault disappears after the diagnostic trouble code (DTC) has been permanently stored in the control module, information about the fault remains stored in the control module (the exception is diagnostic trouble code (DTC) CCU-210 - no vehicle speed signal).
Reading off the Volvo on-board diagnostic (OBD) system
Fault data and other information can be read off using the Volvo Scan Tool (ST) or VIDA PC connected to the data link connector (DLC) under the center console cover.
Volvo on-board diagnostic (OBD) system
Using the Volvo Scan Tool (ST) it is possible to:
- read off and erase stored diagnostic trouble codes (DTCs)
- calibrate the convertible top system
- continuously monitor the values and status of the input and output signals for the signals
- activate certain functions
- program the control module with certain information
- read off the programmed values
- read off control module identification.
To activate the Volvo on-board diagnostic (OBD) system:
- the ignition on
- normal battery voltage.
Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function. The on-board diagnostic (OBD) system can identify several types of fault in the form of diagnostic trouble codes (DTCs).
Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once.
Reading off input and output signals
Using this function, the values and status of the control module input and output signals can be continuously read off.
The following parameters can be read off:
- Battery voltage
- The power supply to the potentiometer
- Position potentiometer
- Stored potentiometer values
- Micro-switch status
- Active motors
- Relay groups.
Activating components and functions
Components / functions in the convertible system can be activated using this option.
The following components can be activated:
- Convertible top left / right motor
- Tensioner bow left / right motor
- Lock cover motor
- Rear latches
- Front convertible top locking.
Calibrating and programming data
This option calibrates the convertible top for fault free operation. The convertible top sensor values must be programmed and calibrated when replacing or adjusting the convertible top, and replacing the control module or potentiometer.
Reading off the control module identification
The control module can be identified by reading off a code from the control module memory.
This code contains information about the control module P/N.
Function description
The convertible top control module controls seven motors for opening and closing the convertible top through a sequential control system. This is made possible by a status control system. Potentiometers and micro-switches are used to determine the position or condition of the convertible top. The convertible top and the tension bow each use two motors. The convertible control unit controls the motors for the front latch, the rear latch and cover locks.
In addition the convertible control unit starts the warning buzzer and LED in the convertible top button (LED) to indicate the present position of the convertible top.
The remote trunk lid opening and rear windshield heater functions are controlled by the convertible control unit to avoid collisions between the trunk lid and the convertible top while the top is moving.
Release movements
In manual operation the convertible top can reach a position which cannot normally be reached with operation by the convertible control unit. If the ignition is switched on or convertible top movement is attempted in either direction using the convertible top button, the position will be detected as not permitted. Release movements means that the convertible control unit attempts to get the convertible top to a defined position after the convertible top has been operated manually or has reached an undefined position. A defined position is the convertible top in closed position; front lock open; tensioner bow upwards; cover lock open and cover open in maximum position.
Release only starts if the driver requests convertible top movement.
Final check
After completed fault-tracing and verification a final check must be carried out as follows:
- Run the entire convertible sequence (down - up) twice
- Read off the Volvo Scan Tool (ST).
No diagnostic trouble codes (DTCs) must be stored for the system in order for the final check to be approved.