Manual Temperature Control

B105B - Recirculation Door Control Circuit Open

For a complete wiring diagram, refer to.

Theory of Operation

The A/C heater control drives the recirculation door actuator via the recirculation door driver circuit and the common door driver 2 circuit.

• When Monitored: With the ignition on.

• Set Condition: If the recirculation door actuator electrical circuit is open.






• This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored.

Test Step 1 - Check for an Active Control Circuit/Performance DTCs

• Turn the ignition ON.

• With the scan tool, read active HVAC DTCs.

Does the Scan Tool Display any Active Control Circuit/Performance DTCs?

Yes

• Diagnose and repair the DTCs. If present, diagnose and repair all rear blend and rear mode door control circuit/performance DTCs first, then all other control circuit/performance DTCs next. Refer to the table of contents in this section for a complete list of all HVAC related symptoms.

No

• Go to Test Step 2 => [ Test Step 2 - Check Recirculation Door Driver Circuit for an Open ]

Test Step 2 - Check Recirculation Door Driver Circuit for an Open

• Turn the ignition OFF.

• Disconnect the A/C heater control C1 harness connector.

• Disconnect the recirculation door actuator harness connector.

• Measure the resistance of the recirculation door driver circuit between the A/C heater control C1 harness connector and the recirculation door actuator harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 3 => [ Test Step 3 - Check Common Door Driver 2 Circuit for an Open ]

No

• Repair the recirculation door driver circuit for an open.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 3 - Check Common Door Driver 2 Circuit for an Open

• Measure the resistance of the common door driver 2 circuit between the A/C heater control C1 harness connector and the recirculation door actuator harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 4 => [ Test Step 4 - Check Recirculation Door Actuator Circuit Resistance ]

No

• Repair the common door driver 2 circuit for an open.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 4 - Check Recirculation Door Actuator Circuit Resistance

• Reconnect the recirculation door actuator harness connector.

• Measure the resistance between the recirculation door driver circuit and the common door driver 2 circuit in the A/C heater control C1 harness connector.

Is the resistance between 30 and 40 ohms?

Yes

• Replace the recirculation door actuator.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Replace the A/C heater control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test