Checking Damper Motor Module (DMM)

Checking the Damper Motor Module (DMM)

Checking control modules

The Damper motor module (DMM) consists of a control unit and a stepper motor. The climate control system can have up to 5 Damper motor modules (DMM), the amount depends on the version of climate control system. These Damper motor module (DMM) control recirculation, defroster, temperature left/right and air distribution.
- Ignition switch position II.
To check which control module/sensors are part of vehicle configuration and of Climate control module (CCM) expected/detected control modules/sensors, click on the symbol for VCT2000.
If a control module is missing according to the car configuration, check that the control module is installed and correctly connected.
Read off which control module/sensors are on LIN bus 1 and 2 and compare them with the vehicle configuration.
The control modules and sensors that are to be included and which can be presented in the vehicle configuration can be read out from the tables below.

Was a damaged Damper motor module (DMM) found?

Yes - Identification of damper motors

No - Checking the damper motor control

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Checking functions
- Ignition switch position II.
To check that identification and calibration rectified the fault, click VCT2000 and read out the expected and detected control modules/sensors. Check that all relevant units are present and that the customer symptoms that were present previously are now not present.
If a module is still missing, identify which one and replace it. After replacement, check whether the customer symptom remains.
If customer symptoms remain and all units are approved, continue with the next step of symptom fault-tracing.

Other information:
- Damper motor module (DMM) temperature, replacing, L.H.D Damper Motor Module (DMM) Temperature, Replacing
- Damper motor module (DMM) defroster, replacing, L.H.D Damper Motor Module (DMM) Defroster, Replacing
- Damper motor module (DMM) recirculation, replacing, L.H.D Damper Motor Module (DMM) Recirculation, Replacing
- Damper motor module (DMM) air distribution, replacing, L.H.D Damper Motor Module (DMM) Air Distribution, Replacing

The Damper motor module (DMM) has a preset value for the number of steps between the limit positions. If a damper motor module (DMM) is faulty, this can be seen by the actual range being outside the preset range by more than the tolerance.
- Ignition switch position II.
Click on the symbol for VCT2000 to read off the range for the Damper motor module (DMM). Then compare each actual range of the Damper motor module (DMM) with the preset range. The Damper motor module (DMM) recirculation values depend on whether the vehicle is left or right hand drive. The difference between preset and actual range must not be greater than the tolerance. If there is a Damper motor module (DMM) with a greater difference, the Damper motor module (DMM) is damaged or incorrectly calibrated. If a Damper motor module (DMM) displays the value 0 or 4095, this also means that the Damper motor module (DMM) is damaged or incorrectly calibrated.

Was a damaged Damper motor module (DMM) found?

Yes - Calibrating the Damper Motor Module (DMM)

No - Checking the damper motor control

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Identification of damper motors

Checking the function
Damper motor module (DMM) faults may be due to something obstructing the damper, which means that the Damper motor module (DMM) cannot calibrate itself. Check that the damper is not blocked and that is has not become stuck. Look, for example, for a screw, cable or foam rubber gasket. Check that the damper motor is correctly installed. Also check that the damper can move freely.

Continue - Identifying the Damper Motor Module (DMM)

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Identifying the Damper Motor Module (DMM)

Hint: When identifying damper motors, each damper motor must be run to its limit position. These operations can take up to 30 seconds. When identifying the damper motors it is important that a battery charger is connected.

- Ignition off
- Reinstall the connectors, components etc.

Note! Climate Control Module (CCM) and damper motors can be affected by the temperature. The vehicle should have normal room temperature when performing this service.

Carry out identification as follows:
- Ignition on.
- Click on the VCT2000 symbol. Wait until identification has been carried out.
- Ignition off.

Continue - Calibrating the Climate Control Module (CCM)

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Calibrating the Climate Control Module (CCM)

Caution! When activating this function, calibration of the Climate Control Module (CCM) starts. After carrying out calibration read off of the diagnostic trouble codes (DTCs) starts. To ensure that diagnostics for the Climate Control Module (CCM) have been carried out, delay for 30 seconds before reading out diagnostic trouble codes (DTCs) after calibration.

Note! Climate Control Module (CCM) and damper motors can be affected by the temperature. The vehicle should have normal room temperature when performing this service.

Carry out calibration as follows:
- Ignition on.
- Click on the VCT2000 symbol. Wait until calibration has been carried out and diagnostic trouble codes (DTCs) read out.
- Ignition off.
This function controls the components that communicate with the Climate Control Module (CCM) via LIN bus 1 and LIN bus 2. In the event of a fault in any of the LIN buses, diagnostic trouble codes (DTCs) CCM-0070 to CCM-0071 will be stored depending on the fault. These diagnostic trouble codes (DTCs) can only be stored in conjunction with this diagnostic function.
If any of these diagnostic trouble codes (DTCs) recur, recalibrate to check if the problem was overcome. If the diagnostic trouble code (DTC) recurs, fault-trace the relevant diagnostic trouble code (DTC).

Continue - DONE

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DONE - Checking functions

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Calibrating the Damper Motor Module (DMM)

Calibrating the Climate Control Module (CCM)

Caution! When activating this function, calibration of the Climate Control Module (CCM) starts. After carrying out calibration read off of the diagnostic trouble codes (DTCs) starts. To ensure that diagnostics for the Climate Control Module (CCM) have been carried out, delay for 30 seconds before reading out diagnostic trouble codes (DTCs) after calibration.

Note! Climate Control Module (CCM) and damper motors can be affected by the temperature. The vehicle should have normal room temperature when performing this service.

Continue - DONE

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DONE - Checking functions

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Checking the damper motor control

There are several parameters that describe the status of each Damper motor module (DMM). To locate the suspected damaged Damper motor module (DMM) from this data, an analysis should be carried out where all parameters are observed.
- Ignition switch position II.
- Blower fan on.
Click on VCT2000 to read off how many times a Damper motor module (DMM) has lost its position, the number of unexpected stops for each Damper motor module (DMM), the actual and desired positions of the Damper motor module (DMM) and how many times each Damper motor module (DMM) has been calibrated.

Note! If the number of calibrations does not appear, this means that the software in the vehicle does not support this service. Continue with fault tracing until complete and then download new software.

The parameters that were read out should be interpreted as follows:
- The values for the number of lost positions for the control modules for temperature left and right should be the same.
- Also check to see if any of the damper motors has a considerably greater number of lost positions than another. This is indicated by how difficult it is for the Damper motor module (DMM) to maintain its position.
- If a Damper motor module (DMM) stops unexpectedly a number of times, the motor has difficulty in reaching the position requested by the Climate control module (CCM).
- Also compare the desired position and actual position and check that the difference is not too great for any of the Damper motor modules (DMM). This is indicated by how difficult it is for the motor to reach the requested position.
- If a control module has many calibrations, it is probably damaged.
If a Damper motor module (DMM) has a combination of the above problems and has a serial number between: 051101XXXXXX - 060430XXXXXX as well as 060801XXXXXX - 060930XXXXXX the replace the unit.
Even if only a combination of the above problems arise, the motor may still be damaged.

Other information:
- Damper motor module (DMM) temperature, replacing, L.H.D Damper Motor Module (DMM) Temperature, Replacing
- Damper motor module (DMM) defroster, replacing, L.H.D Damper Motor Module (DMM) Defroster, Replacing
- Damper motor module (DMM) recirculation, replacing, L.H.D Damper Motor Module (DMM) Recirculation, Replacing
- Damper motor module (DMM) air distribution, replacing, L.H.D Damper Motor Module (DMM) Air Distribution, Replacing

Was a damaged Damper motor module (DMM) found?

Yes - Replacing the control module

No - Information

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Checking functions
- Ignition switch position II.
To check that calibration rectified the fault, click VCT2000 and read off the range for the Damper motor module (DMM). Check that all units have the correct range and that the customer symptoms that were present previously are now not present.
If the range is still incorrect for any of the Damper motor modules (DMM), identify which control module it is and replace it. After replacement, check whether the customer symptom remains.
If customer symptoms remain and all units are approved, continue with the next step of symptom fault-tracing.

Other information:
- Damper motor module (DMM) temperature, replacing, L.H.D Damper Motor Module (DMM) Temperature, Replacing
- Damper motor module (DMM) defroster, replacing, L.H.D Damper Motor Module (DMM) Defroster, Replacing
- Damper motor module (DMM) recirculation, replacing, L.H.D Damper Motor Module (DMM) Recirculation, Replacing
- Damper motor module (DMM) air distribution, replacing, L.H.D Damper Motor Module (DMM) Air Distribution, Replacing

Do you wish to continue with symptom fault tracing?

Yes - Checking the damper motor control

No - FAULT FOUND

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Information
The fault must now be detected and remedied. As this is not the case, the fault-tracing has failed.
Exit symptom fault-tracing or try again.

Do you want to exit fault-tracing?

Yes - FAULT FOUND

No - Checking control modules

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Calibrating the Damper Motor Module (DMM)
DONE - Replacing the control module

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Replacing the control module
Replace the located and damaged Damper motor module (DMM). After replacement, check that the customer symptom no longer remains.
If customer symptoms remain, check that the Climate control module (CCM) has the latest software. Check this by purchasing an upgrade for the Climate control module (CCM) and downloading it to the control module.

Note! After downloading new software, all parameters are reset and further fault tracing becomes harder.

After downloading, check whether the customer symptoms remains.
The fault must now be detected and remedied. If this is not the case, the fault-tracing has failed. Exit symptom fault-tracing or try again.

Other information:
- Damper motor module (DMM) temperature, replacing, L.H.D Damper Motor Module (DMM) Temperature, Replacing
- Damper motor module (DMM) defroster, replacing, L.H.D Damper Motor Module (DMM) Defroster, Replacing
- Damper motor module (DMM) recirculation, replacing, L.H.D Damper Motor Module (DMM) Recirculation, Replacing
- Damper motor module (DMM) air distribution, replacing, L.H.D Damper Motor Module (DMM) Air Distribution, Replacing

Do you want to exit fault-tracing?

Yes - FAULT FOUND

No - Checking control modules

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