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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 1 >> Possible causes, elimination, notes

Possible causes, elimination, notes

Diagnosis conditions 

No control module fault stored.

No fault with supply voltage (terminal 15).

Open circuit 

  1. Unplug connector B from the heating/air-conditioning control.
  2. Unplug connector III from the instrument cluster.
  3. Connect ohmmeter to connector B 13 and to connector III pin 26.

    Display: < 5 ohm

NOTE: The wire is routed via the 12-pole plug connection on the heating/air-conditioning unit.

Short to ground 

  1. Unplug connector B from the heating/air-conditioning control.
  2. Unplug connector III from the instrument cluster.
  3. Connect ohmmeter to connector B 13 and ground.

    Display: "INFINITY" ohm

    If 0 - 5 ohm is displayed, check wiring harness for pinching and chafing damage.

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