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B10A9

B10A9-RIGHT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE (ATC)


B10A9-Right Blend Door Control Circuit/Performance (ATC):




WHEN MONITORED
When driving the Right Blend Door Actuator.

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

POSSIBLE CAUSES
- Right blend door seized, binding, obstructed
- (C52) right blend door driver (A) circuit shorted to voltage
- (C252) right blend door driver (B) circuit shorted to voltage
- (C52) right blend door driver (A) circuit shorted to ground
- (C252) right blend door driver (B) circuit shorted to ground
- (C52) right blend door driver (A) circuit shorted to other door driver circuit(s)
- (C252) right blend door driver (B) circuit shorted to other door driver circuit(s)
- (C52) right blend door driver (A) circuit shorted to (C252) right blend door driver (B) circuit
- (C52) right blend door driver (A) circuit open
- (C252) right blend door driver (B) circuit open
- Right 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: B10AD RIGHT 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 (C52) RIGHT 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 (C52) Right Blend Door Driver (A) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C52) Right 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 (C252) RIGHT BLEND DOOR DRIVER (B) CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage of the (C252) Right Blend Door Driver (B) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C252) Right 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 (C52) RIGHT BLEND DOOR DRIVER (A) CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (C52) Right 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 (C52) Right 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 (C252) RIGHT BLEND DOOR DRIVER (B) CIRCUIT FOR A SHORT TO GROUND




Measure the resistance of the (C252) Right 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 (C252) Right 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 (C52) RIGHT BLEND DOOR DRIVER (A) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C52) Right Blend Door Driver (A) circuit and the (C266) Mode Door Driver (B) circuit, the (C66) Mode Door Driver (A) circuit, the (C255) Left Blend Door Driver (B) circuit, the (C55) Left 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 (C52) Right 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 (C52) Right Blend Door Driver (A) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7

7. CHECK (C252) RIGHT BLEND DOOR DRIVER (B) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C252) Right Blend Door Driver (B) circuit and the (C266) Mode Door Driver (B) circuit, the (C66) Mode Door Driver (A) circuit, the (C255) Left Blend Door Driver (B) circuit, the (C55) Left 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 (C252) Right 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 (C252) Right Blend Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 8

8. CHECK RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C52) Right Blend Door Driver (A) circuit and the (C252) Right 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 (C52) RIGHT BLEND DOOR DRIVER (A) CIRCUIT FOR A SHORT TO (C252) RIGHT BLEND DOOR DRIVER (B) CIRCUIT




Disconnect the Right Blend Door Actuator harness connector.
Measure the resistance between the (C52) Right Blend Door Driver (A) circuit and the (C252) Right Blend Door Driver (B) circuit in the A/C
Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C52) Right Blend Door Driver (A) circuit for a short to the (C252) Right Blend Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Right Blend Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

10. CHECK (C52) RIGHT BLEND DOOR DRIVER (A) CIRCUIT FOR AN OPEN




Disconnect the Right Blend Door Actuator harness connector.
Measure the resistance of the (C52) Right Blend Door Driver (A) circuit between the A/C Heater Control C2 harness connector and the Right Blend Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 11
NO: Repair the (C52) Right Blend Door Driver (A) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

11. CHECK (C252) RIGHT BLEND DOOR DRIVER (B) CIRCUIT FOR AN OPEN




Measure the resistance of the (C252) Right Blend Door Driver (B) circuit between the A/C Heater Control C2 harness connector and the Right Blend Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Right Blend Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (C252) Right 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: B10A9-RIGHT 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 Right Blend Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
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