B10A5

B10A5-LEFT BLEND DOOR CONTROL CIRCUIT OPEN (ATC)

B10A5 - Left Blend Door Control Circuit Open (ATC):

WHEN MONITORED
When actuator movement is requested.

SET CONDITION
If the (C255) Left Blend Door Driver circuit or the (C55) Left Blend Door Common Driver circuit is open.

POSSIBLE CAUSES
- (C255) left blend door driver circuit open
- (C55) left blend door common driver circuit open
- Left blend door actuator
- A/C heater control

Diagnostic Test

1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs

Turn the ignition on.
With the scan tool, read active HVAC DTCs.

Q: Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs?

YES: Diagnose and repair the DTC(s). Refer to Trouble Code Diagnostic Charts for a complete list of HVAC related symptoms.
NO: Go To 2




2. CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE

Turn the ignition off.
Disconnect the A/C Heater Control C2 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.

Q: Is the resistance above 70.0 ohms?

YES: Go To 3
NO: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




3. CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR AN OPEN

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

Q: Is the resistance below 5.0 ohms?

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




4. CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR AN OPEN

Measure the resistance of the (C55) Left Blend Door Common Driver circuit between the Left Blend Door Actuator harness connector and the A/C Heater Control C2 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 (C55) Left Blend Door Common Driver circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test