125000564 - J21 HEATED REAR WINDSCREEN NOT WORKING

With the ignition on, when the appropriate button in the climate control system control panel is pressed, the heated rear window does not warm up properly.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Check that the door mirrors defrost properlyContinue to Step 1The door mirrors do not defrostContinue according to the instructions inSee table    See table J20 REARSCREEN AND DOOR MIRROR DEFROSTING NOT WORKING
1HEATED REAR WINDSCREEN ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation
Check that the heated rear window is connected to earth properly See    See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING.Check that the heated rear window is supplied properly: with the ignition ON and the defrosting button activated, the battery voltage should be at the supply cableContinue to Step 2No supply from batteryRestore the correct supply to the relay. If necessary replace the faulty components (if a fuse is involved, search for the cause of the problem)
Connections faultyRestore the correct connections. See    See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING
2RESISTANCE CHECKAll OKProblems metOperation
Check the continuity of the heated rear window demisting heating elementContinue to Step 3Heating element brokenReplace the rearscreen Op.    Op. 7035B14 REAR WINDOW GLASS R R INCLUDES CLEANING OF HOUSING
3CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.