Recirculation Door Control Circuit/Performance (ATC)
B1058-RECIRCULATION DOOR CONTROL CIRCUIT/PERFORMANCE (ATC)
For a complete wiring diagram refer to Diagrams/Electrical.
Theory of Operation
The A/C Heater Control drives the Front Blend Door Actuator via the (C61) Front Blend Door Driver circuit and the (C34) Common Door Driver 1 circuit. The Front Blend Door Actuator and the Recirculation 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 type of short, its location, and the direction the actuator is moving when the short is present.
- When Monitored:
With the ignition on.
- Set Condition:
If the A/C Heater Control detects a short on the (C61) Front Blend Door Driver circuit, the (C32) Recirculation Door Driver circuit, or the (C34) Common Door Driver 1 circuit while attempting to drive this actuator. 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: The DTC must be active for the results of this test to be valid. Do not perform this test if the DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. HVAC System Test (ATC)
Diagnostic Test
1.CHECK (C61) FRONT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C61) Front Blend Door Driver circuit.
Is the voltage above 0.2 volts?
Yes
- Repair the (C61) Front Blend Door Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 2
2.CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
Measure the voltage of the (C32) Recirculation Door Driver circuit.
Is the voltage above 0.2 volts?
Yes
- Repair the (C32) Recirculation Door Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 3
3.CHECK (C34) COMMON DOOR DRIVER 1 CIRCUIT FOR A SHORT TO VOLTAGE
Measure the voltage of the (C34) Common Door Driver 1 circuit.
Is the voltage above 0.2 volts?
Yes
- Repair the (C34) Common Door Driver 1 circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 4
4.CHECK (C61) FRONT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (C61) Front Blend Door Driver circuit between ground and the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C61) Front Blend Door Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 5
5.CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND
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 6
6.CHECK (C34) COMMON DOOR DRIVER 1 CIRCUIT FOR A SHORT TO GROUND
Measure the resistance of the (C34) Common Door Driver 1 circuit between ground and the A/C Heater Control C1 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C34) Common Door Driver 1 circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 7
7.CHECK (C61) FRONT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS
Measure the resistance between the (C61) Front Blend Door Driver circuit and the (C54) Rear Blend Door Driver circuit, the (C808) Common Door Driver 3 circuit, the (C32) Recirculation Door Driver circuit, the (C154) Rear Common Door Driver circuit, the (C53) Rear Mode Door Driver circuit, the (C801) Mode Door 2 Driver circuit, the (C807) Common Door Driver 2 circuit, and the (C29) Mode Door 1 Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 100 ohms between the (C61) Front Blend Door Driver circuit and any of the other door driver circuits?
Yes
- Repair the circuit(s) with a resistance below 100 ohms for a short to the (C61) Front Blend Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 8
8.CHECK (C32) RECIRCULATION DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS
Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C54) Rear Blend Door Driver circuit, the (C808) Common Door 3 Driver circuit, the (C154) Rear Common Door Driver circuit, the (C53) Rear Mode Door Driver circuit, the (C801) Mode Door 2 Driver circuit, the (C807) Common Door Driver 2 circuit, and the (C29) Mode Door 1 Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 100 ohms between the (C32) Recirculation Driver circuit and any of the other door driver circuits?
Yes
- Repair the circuit(s) with a resistance below 100 ohms for a short to the (C32) Recirculation Door Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 9
9.CHECK (C34) COMMON DOOR DRIVER 1 CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS
Measure the resistance between the (C34) Common Door Driver 1 circuit and the (C54) Rear Blend Door Driver circuit, the (C808) Common Door Driver 3 circuit, the (C154) Rear Common Door Driver circuit, the (C53) Rear Mode Door Driver circuit, the (C801) Mode Door 2 Driver circuit, the (C807) Common Door Driver 2 circuit, and the (C29) Mode Door 1 Driver circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 100 ohms between the (C34) Common Door Driver 1 circuit and any of the other door driver circuits?
Yes
- Repair the circuits with a resistance below 100 ohms for a short to the (C34) Common Door Driver 1 circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 10
10.CHECK FRONT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C61) Front Blend Door Driver circuit and the (C34) Common Door Driver 1 circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 30 ohms?
Yes
- Go To 11
No
- Go To 12
11.CHECK (C61) FRONT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO (C34) COMMON DOOR DRIVER 1 CIRCUIT
Disconnect the Front Blend Door Actuator harness connector.
Measure the resistance between the (C61) Front Blend Door Driver circuit and the (C34) Common Door Driver 1 circuit in the A/C Heater Control C1 harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the (C61) Front Blend Door Driver circuit for a short to the (C34) Common Door Driver 1 circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Replace the Front Blend Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
12.CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE
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 below 30 ohms?
Yes
- Go To 13
No
- Go To 14
13.CHECK (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO (C34) COMMON DOOR DRIVER 1 CIRCUIT
Disconnect the Recirculation Door Actuator 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 below 100 ohms?
Yes
- Repair the (C32) Recirculation Door Driver circuit for a short to the (C34) Common Door Driver 1 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
14.RUN THE ACTUATOR CALIBRATION TEST
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on.
With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs.
Does the scan tool only display: B1058-RECIRCULATION DOOR CONTROL CIRCUIT/PERFORMANCE?
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).
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