Climate Control Unit Power and Ground Circuit Troubleshooting
Climate Control Unit Power and Ground Circuit Troubleshooting
NOTE: Do this troubleshooting procedure only if sent here by symptom troubleshooting index.

1.
Fuse check:

Fuse check
?1.
Check the following fuse.
Fuse
No. C24 (7.5 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. C24 (7.5 A) fuse circuit.?
2.
Open wire check (IG2 A/C line):

Open wire check (IG2 A/C line)
?1.
Disconnect the following connector.
Climate control unit 32P connector

?2.
Turn the vehicle to the ON mode.

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Climate control unit 32P connector: disconnected
Test point 1
Climate control unit 32P connector No. 2
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The IG2 A/C wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open in the wire between the No. C24 (7.5 A) fuse in the under-dash fuse/relay box and the climate control unit. If wire is OK, replace the under-dash fuse/relay box.?
3.
Open wire check (GND line):

Open wire check (GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Test point 1
Climate control unit 32P connector No. 17
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
The GND wire is OK. Replace the climate control unit.?
     
NO
     
     
     
Check for an open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G403.?