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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater, Diagnosis - 911 CARRERA (996) >> System H 01 >> Fault overview >> Test point 5 >> Possible causes, elimination, notes

Possible causes, elimination, notes

Diagnosis conditions 

No control module fault stored.

Voltage too high 

Check the alternator.

Voltage too low 

  1. Check the alternator.
  2. Check or charge the battery.
  3. Check contact resistance of wire connections.
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