Rear Blend Door Control Circuit High (ATC)
B1054-REAR BLEND DOOR CONTROL CIRCUIT HIGH (ATC)B1054-Rear Blend Door Control Circuit High (ATC):
WHEN MONITORED
When the Actuator DTC Detection Test is executed.
SET CONDITION
If the (C53) Rear Mode Door Driver circuit, the (C54) Rear Blend Door Driver circuit, the (C801) Mode Door 2 Driver circuit, the (C154) Rear Common Door Driver circuit, or the (C808) Common Door Driver 3 circuit is shorted to voltage.
POSSIBLE CAUSES
- (C53) rear mode door driver circuit shorted to voltage
- (C54) rear blend door driver circuit shorted to voltage
- (C801) mode door 2 driver circuit shorted to voltage
- (C154) Rear common door driver circuit shorted to voltage
- (C808) common door driver 3 circuit shorted to voltage
- A/C heater control
Theory Of Operation
The A/C Heater Control drives the Rear Mode Door Actuator via the (C53) Rear Mode Door Driver circuit and the (C154) Rear Common Door Driver circuit. The A/C Heater Control drives the Rear Blend Door Actuator via the (C54) Rear Blend Door Driver circuit and the (C154) Rear Common Door Driver circuit. In addition, the Rear Mode Door Actuator, the Rear Blend Door Actuator, and the Mode Door 2 (Floor to Defrost) Actuator 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.
Diagnostic Test
1. CHECK (C53) REAR MODE DOOR DRIVER CIRCUIT, (C54) REAR BLEND DOOR DRIVER CIRCUIT, (C808) COMMON DOOR DRIVER 3 CIRCUIT, (C154) REAR COMMON DOOR DRIVER CIRCUIT, & (C801) MODE DOOR 2 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 (C53) Rear Mode Door Driver circuit.
Measure the voltage of the (C54) Rear Blend Door Driver circuit.
Measure the voltage of the (C808) Common Door Driver 3 Circuit.
Measure the voltage of the (C154) Rear Common Door Driver circuit.
Measure the voltage of the (C801) Mode Door 2 Driver circuit.
Q: Is the voltage above 0.2 volts on any of the circuits?
YES: Repair the circuit(s) with voltage above 0.2 volts for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2
2. RUN THE ACTUATOR DTC DETECTION TEST
Turn the ignition off.
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is complete, select View DTCs.
Q: Does the scan tool display: B1054-REAR BLEND DOOR CONTROL CIRCUIT HIGH?
YES: Replace the A/C Heater Control in accordance with the Service Information. 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 circuits, 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