I have a new blend motor dangling from the harness. If I change the temp, the gear on the blend motor does not rotate. So I put in a different climate control head unit from ebay. Same thing... the gear will not turn.


What else could cause the blend door motor not to work?
Is there a way to test the wiring harness at the blend door motor with a volt meter?

 

Try running the self test.To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
<TABLE cellSpacing=0 cellPadding=3 border=1><TBODY><TR><TD style="BORDER-BOTTOM: medium none" vAlign=top align=middle></TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=middle>024</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=middle>022</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left>Blend Door Short</TD><TD style="BORDER-BOTTOM: medium none" vAlign=top align=left></TD></TR><TR><TD style="BORDER-TOP: medium none" vAlign=top align=middle></TD><TD style="BORDER-TOP: medium none" vAlign=top align=middle>N/A</TD><TD style="BORDER-TOP: medium none" vAlign=top align=middle>025</TD><TD style="BORDER-TOP: medium none" vAlign=top align=left>Blend Door Failure</TD><TD style="BORDER-TOP: medium none" vAlign=top align=left></TD></TR><TR><TD vAlign=top align=middle></TD><TD vAlign=top align=middle>031</TD><TD vAlign=top align=middle>N/A</TD><TD vAlign=top align=left>A/C In-Vehicle Temperature Sensor Open Circuit</TD><TD vAlign=top align=left></TD></TR><TR><TD vAlign=top align=middle></TD><TD vAlign=top align=middle>030</TD><TD vAlign=top align=middle>N/A</TD><TD vAlign=top align=left>A/C In-Vehicle Temperature Sensor Short to Ground</TD><TD vAlign=top align=left></TD></TR><TR><TD vAlign=top align=middle></TD><TD vAlign=top align=middle>041</TD><TD vAlign=top align=middle>043</TD><TD vAlign=top align=left>A/C Ambient Temperature Sensor Open Circuit</TD><TD vAlign=top align=left></TD></TR><TR><TD vAlign=top align=middle></TD><TD vAlign=top align=middle>040</TD><TD vAlign=top align=middle>042</TD><TD vAlign=top align=left>A/C Ambient Temperature Sensor Short to Ground</TD><TD vAlign=top align=left></TD></TR><TR><TD vAlign=top align=middle></TD><TD vAlign=top align=middle>050</TD><TD vAlign=top align=middle>052</TD><TD vAlign=top align=left>A/C Solar Radiation Sensor Circuit Short to Ground</TD></TR></TBODY></TABLE>