HVAC DTC Troubleshooting: 7
DTC indicator 7: An Open in the Recirculation Control Motor Circuit
1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?2.
Do the Self-Diagnostic Function with the HVAC control unit.

?3.
Check for DTCs.

Is DTC 7 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.?
2.
Determine possible failure area (RFD-P/FRD-P line, others):

Determine possible failure area (RFD-P/FRD-P line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Recirculation control motor 7P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Recirculation control motor 7P connector: disconnected
Test point 1
Recirculation control motor 7P connector No. 2
Test point 2
Body ground


Is there about 5 V?

     
YES
     
     
     
The RFD-P/FRD-P wire is OK. Go to step 3.
     
NO
     
     
     
Go to step 4.
3.
Open wire check (SENSOR COM/SENS-COM line):

Open wire check (SENSOR COM/SENS-COM line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Recirculation control motor 7P connector: disconnected
Test point 1
Recirculation control motor 7P connector No. 1
Test point 2
Recirculation control motor 7P connector No. 2


Is there about 5 V?

     
YES
     
     
     
The SENSOR COM/SENS-COM wire is OK. Replace the recirculation control motor.
     
NO
     
     
     
Repair an open in the wire between the HVAC control unit and the recirculation control motor.?
4.
Open wire check (RFD-P/FRD-P line):

Open wire check (RFD-P/FRD-P line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Recirculation control motor 7P connector: disconnected
Test point 1
HVAC control unit 32P connector No. 21
Test point 2
Body ground

Is there about 5 V?

     
YES
     
     
     
Repair an open in the wire between the HVAC control unit and the recirculation control motor.?
     
NO
     
     
     
The RFD-P/FRD-P wire is OK. Replace the HVAC control unit.?