MTC-SHORT

B105B-RECIRCULATION DOOR CONTROL CIRCUIT OPEN (MTC-SHORT)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .

Theory of Operation


The A/C Heater Control drives the Recirculation Door Actuator via the (C32) Recirculation Door Driver circuit and the (C807) Common Door Driver 2 circuit.


- When Monitored:
With the ignition on.

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







NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC 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 (C32) RECIRCULATION DOOR DRIVER CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the Recirculation Door Actuator harness connector.
Measure the resistance of the (C32) Recirculation Door Driver circuit between the A/C Heater Control C1 harness connector and the Recirculation Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 3


No


- Repair the (C32) Recirculation Door Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


3. CHECK (C807) COMMON DOOR DRIVER 2 CIRCUIT FOR AN OPEN
Measure the resistance of the (C807) Common Door Driver 2 circuit between the A/C Heater Control C1 harness connector and the Recirculation Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 4


No


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


4. CHECK RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE
Reconnect the Recirculation Door Actuator harness connector.
Measure the resistance between the (C32) Recirculation Door Driver circuit and the (C807) Common Door Driver 2 circuit in the A/C Heater Control C1 harness connector.
Is the resistance between 30 and 40 ohms?

Yes


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


No


- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.