Signal Too High

Signal too high

Checking the function of the water pump

Note! On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.




- Ignition on
- Activate the water pump.
Listen for a buzzing sound which indicates that the water pump is running.





Does the water pump function?

Yes - Intermittent fault

No - Checking components and wiring

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Checking components and wiring

Note! On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

Check the cable between control module terminal #12 and water pump terminal 1 for a short-circuit. Check to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
The water pump must be replaced if no faults are found in the cable.
Remedy as necessary.

Other information:
- To access the control module or connect the breakout box, see
- To access or replace the water pump, see Replacing the water pump Replacing Water Pump
- With ignition on and the water pump connector disconnected, the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground must be approximately 0 V
- For other values, see Signal specification Additional heater 912-D/B Signal Specification Additional Heater 912-D/B.













Select Continue.

Continue - Verification

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Verification




Verification

Verification

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

Note! On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Activate the water pump.
Listen for a buzzing sound which indicates that the water pump is running.





Does the water pump function?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the function of the water pump

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Intermittent fault
Check the cable between control module terminal #12 and water pump terminal 1. Check for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Remedy as necessary.

Other information:
- To access the control module or connect the breakout box, see
- To access or replace the water pump, see Replacing the water pump Replacing Water Pump
- With ignition on and the water pump connector disconnected, the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground must be approximately 0 V
- For other values, see Signal specification Additional heater 912-D/B Signal Specification Additional Heater 912-D/B.













Select Continue.

Continue - Fault-tracing information
DONE

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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 the function of the water pump

FAULT-TRACING FAILED - DONE

FAULT FOUND - FAULT FOUND

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