Signal Too High

Signal too high

Checking cables
Check the control module and the damper motor connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check signal cable between MCC control module #B13 and damper motor terminal 3 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check ground lead between MCC control module #B11 and damper terminal 1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable for power supply between MCC control module #B12 and damper motor terminal 2 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new air distribution damper motor.
Remedy as necessary.

Other information:
- To disconnect the control module, see Replacing or adjusting control cables / mechanical rear section and control panel / front section (Manual climate control / STANDARD) Service and Repair.
- To access/replace the air distribution damper motor, refer to Replacing damper motors Removal and Replacement.
- To connect the breakout box, see Connection of breakout box MCC Connection of Breakout Box MCC.
- Voltage on signal cable varies between approximately 0-5 V depending on damper motor position. Damper motor power supply should be approximately 5 V. For other values, see Signal descriptions MCC Signal Descriptions MCC.














Continue - Self-adjusting of shutter motor end position

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Self-adjusting of shutter motor end position
Activate Self adjusting function of shutter motor end position according to Diagnostic functions MCC Diagnostic Functions MCC.

Continue - Verification
DONE

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Verification

Hint: After carrying out the repair, check that the fault has been remedied:












- Ignition off.
- Reinstall connectors, components etc.
Read off diagnostic trouble codes (DTCs) in MCC control module according to Diagnostic functions MCC Diagnostic Functions MCC.
With ignition off all stored diagnostic trouble codes (DTCs), with the exception of MCC 5-1-2 in the MCC control module, are erased. With the ignition on the control module makes a new diagnosis and stores the diagnostic trouble code (DTC) if the fault remains.

Is the diagnostic trouble code (DTC) still stored?

Yes - Fault-tracing information

No - FAULT FOUND

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test


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