MTC

B1043-PANEL MODE DOOR 1 CONTROL CIRCUIT OPEN (MTC)





For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .

Theory of Operation


The A/C Heater Control drives the Mode Door Actuator via the (C35) Mode Door Driver circuit and the (C807) Common Door Driver 2 circuit.


- When Monitored:
With the ignition on.

- Set Condition:
If Mode 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 C1 harness connector.
Disconnect the Mode Door Actuator harness connector.
Measure the resistance of the (C807) Common Door Driver 2 circuit between the A/C Heater Control C1 harness connector and the Mode 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 (C35) MODE DOOR DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C35) Mode Door Driver circuit between the A/C Heater Control C1 harness connector and the Mode Door Actuator harness connector.
Is the resistance below 5.0 ohms?

Yes


- Go To 4


No


- Repair the (C35) Mode Door 1 Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


4. CHECK MODE DOOR ACTUATOR CIRCUIT RESISTANCE




Reconnect the Mode Door Actuator harness connector.
Measure the resistance between the (C35) Mode 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 A/C Heater Control.


No


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