Recirculation Door Control Circuit Low (Single-Zone)

B1059-RECIRCULATION DOOR CONTROL CIRCUIT LOW (SINGLE-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 circuit. 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 type of short, its location, and the direction the actuator is moving when the short is present.

- When Monitored:

When the Actuator DTC Detection Test is executed.

- Set Condition:

If the (C32) Recirculation Door Driver circuit is shorted to ground.






Diagnostic Test

1. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND





Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Measure the resistance of the (C32) Recirculation Door Driver circuit between ground and the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms?

Yes

- Repair the (C32) Recirculation Door Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 2

2. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS





Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C61) Blend Door Driver circuit, the (C29) Mode Door 1 Driver circuit, and the (C801) Mode Door 2 Driver circuit in the A/C Heater Control C1 harness connector.

Is the resistance below 10k ohms between the (C32) Recirculation Door Driver circuit and any of the other door driver circuits?

Yes

- Repair the circuit(s) with a resistance below 10k ohms for a short to the (C32) Recirculation Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3. CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE





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 below 30 ohms?

Yes

- Go To 4

No

- Go To 5

4. CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO (C34) COMMON DOOR DRIVER CIRCUIT





Disconnect the Recirculation Door Actuator 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 below 10k ohms?

Yes

- Repair the (C32) Recirculation Door Driver circuit for a short to the (C34) Common Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

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

5. RUN THE ACTUATOR DTC DETECTION TEST

Reconnect the A/C Heater Control C1 harness connector.

Turn the ignition on.

With the scan tool, erase HVAC DTCs.

With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs.

Does the scan tool only display: B1059-RECIRCULATION DOOR CONTROL CIRCUIT LOW?

Yes

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

No, Other DTC(s) Displayed

- Diagnose and repair the other DTC(s). If multiple DTCs are present, beginning with the common circuit, diagnose and repair all short high DTCs and then all short low DTCs.

No, And No Other DTCs Displayed

- Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test