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Heating and Air Conditioning fault code

cvhs18472
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cvhs18472 Member

cvhs18472

Posted
Posted

I have a 98 Boxster w/ tip. As some of you know I have beeen having trouble with my cooling system after I replaced my water pump. It seems that the fans are not operating correctly now. I was going through fault codes with the Durametric and in Heating and AC code 20 came up, which is listed as Combi-interface Fault. I have not been able to find anything through search or my manual. Has anyone come across this before, or does anyone know what it means. Thanks in advance, Ed

cvhs18472 Member

cvhs18472

Posted
  • Author
Posted

I got a reply from Owen at Durametric about this fault. He explained how to diagnose the problem but I still don't understand the problem. Can anyone suggest a direction to go in the research the code and what it means or is it a dealer only problem? Thanks, Ed

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Loren Member

Loren

Posted
  • Admin
Posted

Fault code 20

Interface to instrument cluster

Possible causes:

- Open circuit

- Short to ground

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 ohms

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: infinite ohms

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

First obvious check would be for a loose or disconnected plug.

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