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Heating and Air Conditioning fault code

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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

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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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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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