B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (ATC)
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The A/C Heater Control monitors the door driver circuits during actuator operation for shorts to ground, shorts to battery, and shorts to other door driver circuits. If detected, the A/C Heater Control reports these types of faults as Control Circuit/Performance DTCs.
- When Monitored:
When actuator movement is requested.
- Set Condition:
If the A/C Heater Control detects an excessive current draw on any of the door driver circuits while attempting to drive this door actuator.
| Possible Causes |
| DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE |
| DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND |
| DOOR DRIVER CIRCUITS SHORTED TOGETHER |
| DOOR ACTUATOR(S) |
| A/C HEATER CONTROL |
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 (ATC) for stored DTC test procedures.
Diagnostic Test
1. CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Turn the ignition on.
Measure the voltage of the (C266) Front Mode Door Driver circuit, the (C66) Front Mode Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, the (C68) Recirculation Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the voltage above 0.2 volts on any of the circuits?
Yes
- Repair all circuits with voltage above 0.2 volts for a short to voltage.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 2
2. CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance of the (C266) Front Mode Door Driver circuit, the (C66) Front Mode Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, the (C68) Recirculation Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit between ground and the A/C Heater Control C2 harness connector.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to ground.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 3
3. CHECK THE (C266) FRONT MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT, THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT, & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C266) Front Mode Door Driver circuit and the (C268) Recirculation Door Driver circuit, the (C68) Recirculation Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to the (C266) Front Mode Door Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 4
4. CHECK THE (C66) FRONT MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT, THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT, & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C66) Front Mode Door Common Driver circuit and the (C268) Recirculation Door Driver circuit, the (C68) Recirculation Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to the (C66) Front Mode Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 5
5. CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT, & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to (C268) Recirculation Door Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 6
6. CHECK THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT, & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C68) Recirculation Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to (C68) Recirculation Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 7
7. CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT, & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to the (C255) Left Blend Door Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 8
8. CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT, & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C61) Right Blend Door Driver circuit, the (C161) Right Blend Door Common Driver circuit, the (C139) Second Row Mode Door Driver circuit, and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to the (C55) Left Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 9
9. CHECK THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C61) Right Blend Door Driver circuit and the (C139) Second Row Mode Door Driver circuit and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to the (C61) Right Blend Door Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 10
10. CHECK THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT & THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Measure the resistance between the (C161) Right Blend Door Common Driver circuit and the (C139) Second Row Mode Door Driver circuit and the (C939) Second Row Mode Door Common Driver circuit.
Is the resistance below 10k ohms on any of the circuits?
Yes
- Repair all circuits with a resistance below 10k ohms for a short to the (C161) Right Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 11
11. CHECK THE FRONT MODE DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C266) Front Mode Door Driver circuit and the (C66) Front Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 30.0 ohms?
Yes
- Go To 12
No
- Go To 13
12. CHECK THE (C266) FRONT MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) FRONT MODE DOOR COMMON DRIVER CIRCUIT
Disconnect the Front Mode Door Actuator harness connector.
Measure the resistance between the (C266) Front Mode Door Driver circuit and the (C66) Front Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C266) Front Mode Door Driver circuit for a short to the (C66) Front Mode Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Front Mode Door Actuator in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
13. CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 30.0 ohms?
Yes
- Go To 14
No
- Go To 15
14. CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT
Disconnect the Recirculation Door Actuator harness connector.
Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C268) Recirculation Door Driver circuit for a short to the (C68) Recirculation Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Recirculation Door Actuator in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
15. CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 30.0 ohms?
Yes
- Go To 16
No
- Go To 17
16. CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT
Disconnect the Left Blend Door Actuator harness connector.
Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C255) Left Blend Door Driver circuit for a short to the (C55) Left Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Left Blend Door Actuator in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
17. CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C61) Right Blend Door Driver circuit and the (C161) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 30.0 ohms?
Yes
- Go To 18
No
- Go To 19
18. CHECK THE (C61) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C161) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT
Disconnect the Right Blend Door Actuator harness connector.
Measure the resistance between the (C61) Right Blend Door Driver circuit and the (C161) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C61) Right Blend Door Driver circuit for a short to the (C161) Right Blend Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Right Blend Door Actuator in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
19. CHECK THE SECOND ROW MODE DOOR ACTUATOR CIRCUIT RESISTANCE
Measure the resistance between the (C139) Second Row Mode Door Driver circuit and the (C939) Second Row Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 30.0 ohms?
Yes
- Go To 20
No
- Go To 21
20. CHECK THE (C139) SECOND ROW MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C939) SECOND ROW MODE DOOR COMMON DRIVER CIRCUIT
Disconnect the Second Row Mode Door Actuator harness connector.
Measure the resistance between the (C139) Second Row Mode Door Driver circuit and the (C939) Second Row Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.
Is the resistance below 10k ohms?
Yes
- Repair the (C139) Second Row Mode Door Driver circuit for a short to the (C939) Second Row Mode Door Common Driver circuit.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Second Row Mode Door Actuator in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
21. RUN THE ACTUATOR CALIBRATION TEST
Reconnect the A/C Heater Control C2 harness connector.
Reconnect the all of the Door Actuator harness connectors.
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: B10A2–LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE?
Yes
- Replace the A/C Heater Control in accordance with the Service Information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No, Other DTC(s) Displayed
- Diagnose and repair the other DTC(s). Refer to the Table of Contents in this Section for a complete list of all HVAC related symptoms.
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).