Recirculation Door Control Circuit Open (Dual-Zone)

B105B-RECIRCULATION DOOR CONTROL CIRCUIT OPEN (DUAL-ZONE)






For a complete wiring diagram refer to 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 circuit. All of the door actuators share the (C34) Common Door Driver. Inside the A/C Heater Control, each door actuator has its own unique driver, but all share a single common door driver circuit. 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:

During actuator calibration.

- Set Condition:

If 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: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test 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).

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 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

- Repair the (C32) Recirculation Door Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

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





Measure the resistance of the (C34) Common 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

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

No

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