ATC

B10A5-LEFT BLEND DOOR CONTROL CIRCUIT OPEN (ATC)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .

Theory of Operation


The A/C Heater Control drives the Left Blend Door Actuator via the (C61) Left Blend Door Driver circuit and the (C34) Common Door Driver circuit.


- When Monitored:
With the ignition on.

- Set Condition:
If the Left Blend Door Actuator's electrical circuit is open.







NOTE: DTC B1043 must be active for the results of this test to be valid. Do not perform this test if DTC B1043 is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. Heating-A/C System Diagnostics


Diagnostic Test


1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs
Turn the ignition on.
With the scan tool, read active HVAC DTCs.
Does the scan tool display any active CONTROL CIRCUIT/PERFORMANCE DTCs?

Yes


- Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, then all other Control Circuit/Performance DTCs next.


No


- Go To 2


2. CHECK (C807) COMMON DOOR DRIVER 2 CIRCUIT FOR AN OPEN




Turn the ignition off.
Disconnect the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Disconnect the Left Blend Door Actuator harness connector.
Measure the resistance of the (C807) Common Door Driver 2 circuit between the A/C Heater Control (3 ZONE ATC) 32 way harness connector and the Left Blend Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 3


No


- Repair the (C807) Common Door Driver 2 circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


3. CHECK (C61) LEFT BLEND DOOR DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C61) Driver Blend Door Driver circuit between the A/C Heater Control (3 ZONE ATC) 32 way harness connector and the Left Blend Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 4


No


- Repair the (C61) Driver Blend Door Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


4. CHECK LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Reconnect the Left Blend Door Actuator harness connector.
Measure the resistance between the (C61) Driver Blend Door Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance between 30 and 40 ohms?

Yes


- Replace the A/C Heater Control.


No


- Replace the Left Blend Door Actuator.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.