Signal Too Low. Permanent Fault
Signal too low. Permanent fault
Checking connectors
- Ignition off
- Check the connector for the damper motor and control module connector A (30-pin). Check for contact resistance and oxidation. Remedy if necessary.
Check for damage carefully
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Wait at least 20 seconds for the control module to carry out its diagnostics
- Read off diagnostic trouble codes (DTCs).
The fault is no longer present if the status of the diagnostic trouble code (DTC) has changed to intermittent.
Other information:
- To remove the control module, see Comfort module Removal and Replacement
- To access the temperature damper motor, see Temperature damper motor Temperature
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Has the status of the diagnostic trouble code (DTC) changed to intermittent?
Yes - FAULT FOUND
No - Checking components
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking connectors
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Checking components
Check the signal cable between climate control module terminal #A19 and damper motor terminal #4. Check for an open-circuit. Check for a short-circuit to ground.
Check the power supply cable between climate control module terminal #A18 and damper motor terminal #1. Check for an open-circuit. Check for a short-circuit to ground.
If the cables are OK, try a new damper motor.
Remedy as necessary.
Other information:
- To access the temperature damper motor, see Temperature damper motor Temperature
- To connect the breakout box, see Connecting the breakout box, climate control module Connecting The Breakout Box
- For the voltage of the signal cable, see Climate control signal specifications Signal Specification
- For other information, see Electrical / electronic system specifications [1][2]Specifications
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Continue - Self-adjustment of the shutter motor end position
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Self-adjustment of the shutter motor end position
Self-adjustment of damper motor end positions
Self-adjustment of damper motor end positions. Electronic climate control (ECC), Manual climate control (MCC), Standard (STD)
Note! Self-adjustment must be carried out if the control module or damper motor is replaced or the damper motor or its linkage has been removed. The indication LED on the climate control module panel will flash during adjustment.
Hint: During self-adjustment the control module runs the damper motors to their limit positions. The control module then stores the value returned from the position sensor for the damper motor. The control module is then able to operate the motor betweenthe limit positions during normal operation.
- Start the engine (the generator charges)
- Activate self-adjustment. The self-adjustment takes thirty seconds.
Note! Self-adjustment can only be carried out once in the same ignition cycle. To run the self-adjustment again, switch off the ignition, wait 10 seconds and start the engine again.
The indication LED stops flashing when the self-adjustment is complete.
Continue - FAULT FOUND
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FAULT FOUND - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Wait at least three minutes so that the control module has time to carry out its diagnostic
- Read off diagnostic trouble codes (DTCs).
The fault has been remedied if the status of the diagnostic trouble code (DTC) has changed to intermittent.
Has the status of the diagnostic trouble code (DTC) changed to intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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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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Attempt New Test - Checking connectors
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