ATC

B1055-REAR 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 Rear Mode Door Actuator via the (C153) Rear Mode Door Driver circuit and the (C34) 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 (C34) Common Door Driver circuit.


- When Monitored:
With the ignition on.

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







NOTE: DTC B1055 must be active for the results of this test to be valid. Do not perform this test if DTC B1055 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 (C54) REAR BLEND DOOR DRIVER CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control (3 Zone ATC) 32 way harness connector.
Disconnect the Rear Blend Door Actuator harness connector.
Measure the resistance of the (C54) Rear Blend Door Driver circuit between the A/C Heater Control (3 Zone ATC) 32 way harness connector and the Rear Blend Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 3


No


- Repair the (C54) Rear Blend Door Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


3. CHECK (C34) COMMON DOOR DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C34) Common Door Driver circuit between the A/C Heater Control (3 Zone ATC) 32 way harness connector and the Rear Blend Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 4


No


- Repair the (C34) Common Door Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


4. CHECK REAR BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Reconnect the Rear Blend Door Actuator harness connector.
Measure the resistance between the (C54) Rear Blend Door Driver circuit and the (C34) Common Door Driver 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.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


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