Manual Temperature Control

B1043 - Panel Mode Door 1 Control Circuit Open






For a complete wiring diagram, refer to.

Theory of Operation

The A/C heater control drives the mode door actuator via the mode door driver circuit and the common door driver 2 circuit.

• When Monitored: With the ignition on.

• Set Condition: If the mode door actuator electrical circuit is open.






• 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.

Test Step 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 DTCs. 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. Refer to the table of contents in this section for a complete list of all HVAC related symptoms.

No

• Go to Test Step 2 => [ Test Step 2 - Check Common Door Driver 2 Circuit for an Open ]

Test Step 2 - Check 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 common door driver 2 circuit between the A/C heater control C1 harness connector and the mode door actuator harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 3 => [ Test Step 3 - Check Mode Door Driver Circuit for an Open ]

No

• Repair the common door driver 2 circuit for an open.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 3 - Check Mode Door Driver Circuit for an Open

• Measure the resistance of the mode door driver circuit between the A/C heater control C1 harness connector and the mode door actuator harness connector.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 4 => [ Test Step 4 - Check Mode Door Actuator Circuit Resistance ]

No

• Repair the mode door 1 driver circuit for an open.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 4 - Check Mode Door Actuator Circuit Resistance






• Reconnect the mode door actuator harness connector.

• Measure the resistance between the mode door driver circuit and the 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 the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test