ATC

B105B-RECIRCULATION DOOR CONTROL CIRCUIT OPEN (ATC)





For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

The A/C Heater Control drives the Recirculation Door Actuator via the (C32) Recirculation Door Driver circuit and the (C34) Common Door Driver 1 circuit. The Recirculation Door Actuator and the Front Blend Door Actuator share the (C34) Common Door Driver 1 circuit and they share a driver inside the A/C Heater Control. Due to the shared circuitry similar DTCs can set at the same time for multiple actuators depending upon the location of the open circuit and the direction the actuator is moving when the open is present.

- When Monitored:
With the ignition on.

- Set Condition:
If the Recirculation Door Actuator's electrical circuit is open. This DTC has a maturing time of 5 seconds and a de-maturing time of 10 seconds. If the DTC's status changes from active to stored it will stay in memory for 100 ignition cycles.





NOTE: DTC B105B must be active for the results of this test to be valid. Do not perform this test if DTC B105B is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures.HVAC System Test

Diagnostic Test

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs
Turn the ignition on.
With the scan tool, read active HVAC DTCs.
Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs?

Yes

- Diagnose and repair the DTC(s). 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.

No

- Go To 2

2. CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C34) Common Door Driver 1 circuit in the A/C Heater Control C1 harness connector.
Is the resistance above 70 ohms?

Yes

- Go To 3

No

- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

3. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR AN OPEN




Disconnect the Recirculation Door Actuator harness connector.
Measure the resistance of the (C32) Recirculation Door Driver circuit between the A/C Heater Control C1 harness connector and the Recirculation Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go To 4

No

- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

4. CHECK (C34) COMMON DOOR DRIVER 1 CIRCUIT FOR AN OPEN




Measure the resistance of the (C34) Common Door Driver 1 circuit between the A/C Heater Control C1 harness connector and the Recirculation Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes

- Replace the Recirculation Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Repair the (C34) Common Door Driver 1 circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.