CEM-5A12

Over heated

Checking the status




- Ignition on.
Click the VCT2000 symbol to activate the blower fan.
Check if the fault is permanent or intermittent.
The fault is permanent if the blower fan does not activate.
If the blower fan is activated, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.





Continue - Checking the component and wiring

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Checking the component and wiring




- Ignition off.
Check the central electronic module (CEM) (terminals #B18, #B32) and the blower fan connector (#2, #3). Check for contact resistance. Check for oxidation.
Check the PWM signal cable between central electronic module (CEM) terminal and the blower fan. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #B18 (#18) and blower fan connector terminal #2.
Check the diagnostic lead between central electronic module (CEM) terminal and the blower fan. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #B32 (#32) and blower fan connector terminal #3.
Check that the blower fan rotor can rotate freely in the climate control system and that nothing is blocking it. Check by hand whether the blower fan rotor can rotate freely.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Temperature sensor passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Continue - 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.
Activate the blower fan.
Check that the function is OK.

Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the component and wiring

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