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B10A2

B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (ATC)

B10A2-Left Blend Door Control Circuit/Performance (ATC):




WHEN MONITORED
When driving the Left Blend Door Actuator.

SET CONDITION
If the A/C Heater Control fails to detect commutator pulses.

POSSIBLE CAUSES
- Left blend door seized, binding, obstructed
- (C55) left blend door driver (A) circuit shorted to voltage
- (C255) left blend door driver (B) circuit shorted to voltage
- (C55) left blend door driver (A) circuit shorted to ground
- (C255) left blend door driver (B) circuit shorted to ground
- (C55) left blend door driver (A) circuit shorted to other door driver circuit(s)
- (C255) left blend door driver (B) circuit shorted to other door driver circuit(s)
- (C55) left blend door driver (A) circuit shorted to (C255) left blend door driver (B) circuit
- (C55) left blend door driver (A) circuit open
- (C255) left blend door driver (B) circuit open
- Left blend door actuator
- A/C heater control

DIAGNOSTIC TEST

1. RUN ACTUATOR CALIBRATION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
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.

Q: Does the scan tool display: B10A6 LEFT BLEND DOOR TRAVEL TOO SMALL?

YES: Diagnose and Repair the DTC. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. CHECK (C55) LEFT BLEND DOOR DRIVER (A) CIRCUIT 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 (C55) Left Blend Door Driver (A) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C55) Left Blend Door Driver (A) circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. CHECK (C255) LEFT BLEND DOOR DRIVER (B) CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage of the (C255) Left Blend Door Driver (B) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C255) Left Blend Door Driver (B) circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 4

4. CHECK (C55) LEFT BLEND DOOR DRIVER (A) CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (C55) Left Blend Door Driver (A) circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C55) Left Blend Door Driver (A) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

5. CHECK (C255) LEFT BLEND DOOR DRIVER (B) CIRCUIT FOR A SHORT TO GROUND




Measure the resistance of the (C255) Left Blend Door Driver (B) circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C255) Left Blend Door Driver (B) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 6

6. CHECK (C55) LEFT BLEND DOOR DRIVER (A) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C55) Left Blend Door Driver (A) circuit and the (C266) Mode Door Driver (B) circuit, the (C66) Mode Door Driver (A) circuit, the (C252) Right Blend Door Driver (B) circuit, the (C52) Right Blend Door Driver (A) circuit, the (C268) Recirculation Door Driver (B) circuit, and the (C68) Recirculation Door Driver (A) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms between the (C55) Left Blend Door Driver (A) circuit and any of the other door driver circuits?

YES: Repair the circuits with a resistance below 10k ohms for a short to the (C55) Left Blend Door Driver (A) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7

7. CHECK (C255) LEFT BLEND DOOR DRIVER (B) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C255) Left Blend Door Driver (B) circuit and the (C266) Mode Door Driver (B) circuit, the (C66) Mode Door Driver (A) circuit, the (C252) Right Blend Door Driver (B) circuit, the (C52) Right Blend Door Driver (A) circuit, the (C268) Recirculation Door Driver (B) circuit, and the (C68) Recirculation Door Driver (A) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms between the (C255) Left Blend Door Driver (B) circuit and any of the other door driver circuits?

YES: Repair the circuits with a resistance below 10k ohms for a short to the (C255) Left Blend Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 8

8. CHECK LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C55) Left Blend Door Driver (A) circuit and the (C255) Left Blend Door Driver (B) circuit in the A/C Heater Control C2 harness connector.

Q: What is the resistance?

Below 30 Ohms
Go To 9
Above 70 Ohms
Go To 10
30 to 70 Ohms
Go To 12

9. CHECK (C55) LEFT BLEND DOOR DRIVER (A) CIRCUIT FOR A SHORT TO (C255) LEFT BLEND DOOR DRIVER (B) CIRCUIT




Disconnect the Left Blend Door Actuator harness connector.
Measure the resistance between the (C55) Left Blend Door Driver (A) circuit and the (C255) Left Blend Door Driver (B) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C55) Left Blend Door Driver (A) circuit for a short to the (C255) Left Blend Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Left Blend Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

10. CHECK (C55) LEFT BLEND DOOR DRIVER (A) CIRCUIT FOR AN OPEN




Disconnect the Left Blend Door Actuator harness connector.
Measure the resistance of the (C55) Left Blend Door Driver (A) circuit between the A/C Heater Control C2 harness connector and the Left Blend Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 11
NO: Repair the (C55) Left Blend Door Driver (A) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

11. CHECK (C255) LEFT BLEND DOOR DRIVER (B) CIRCUIT FOR AN OPEN




Measure the resistance of the (C255) Left Blend Door Driver (B) circuit between the A/C Heater Control C2 harness connector and the Left Blend Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Left Blend Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (C255) Left Blend Door Driver (B) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

12. RUN ACTUATOR CALIBRATION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
Reconnect the A/C Heater Control C2 harness connector.
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.

Q: Does the scan tool display: B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE?

YES: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Using the wiring diagram as a guide, inspect the wiring and connectors for a condition causing an intermittent loss of commutator pulses from the Left Blend Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
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