Manual Temperature Control

B1045 - Panel Mode Door 1 Travel Range Too Large

For a complete wiring diagram, refer to.

Theory of Operation

The A/C Heater Control calibrates each actuator individually. Automatic calibration occurs upon power up after installing a new A/C Heater Control. Manual calibration occurs by sending a command with the scan tool. The purpose of actuator calibration is to determine the total span of door travel between physical stops. To calibrate the actuator, the A/C heater control first moves the door to its soft stop, and then counts the number of pulses it takes to move the door to its other stop. An expected range of span is stored in the control's memory. If the measured calibration value exceeds the expected range for this actuator, this DTC will set. Note that the control clears all stored calibration faults at the beginning of the calibration procedure.

• When Monitored: During actuator calibration.

• Set Condition: If the total span of the mode 1 (Floor to Panel) door exceeds the high range limit.






Test Step 1 - Check for an Active Control Circuit/Performance and Control Circuit Open DTCs

• Turn the ignition ON.

• With the scan tool, read active HVAC DTCs.

Does the Scan Tool Display any Active Control Circuit/Performance or Control Circuit Open DTCs?

Yes

• Diagnose and repair the DTCs. If present, diagnose and repair all rear blend and rear mode door control circuit/performance DTCs first, all other control circuit/performance DTCs second, and all control circuit open DTCs last. 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 for a Broken Mode Door 1 (Floor To Panel) Actuator ]

Test Step 2 - Check for a Broken Mode Door 1 (Floor To Panel) Actuator

• Turn the ignition OFF.

• Remove the mode door 1 (Floor to Panel) actuator from the A/C heater housing assembly.

• By hand, attempt to rotate the actuator in both directions.

Does the actuator turn in either direction?

Yes

• Replace the mode door 1 (Floor to Panel) actuator.

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

No

• Go to Test Step 3 => [ Test Step 3 - Check Mode 1 (Floor To Panel) Door and A/C Heater Housing
For Warped, Worn, Damaged, Missing, and Broken Components ]

Test Step 3 - Check Mode 1 (Floor To Panel) Door and A/C Heater Housing For Warped, Worn, Damaged, Missing, and Broken Components

• Inspect for excessively worn, disconnected, missing, or broken door linkage. Inspect for a damaged or broken A/C heater housing assembly. Inspect for a warped or broken door, and missing door seals. Rotate the door from stop to stop. The door should rotate approximately 90 degrees.

Are there any physical or mechanical problems with the door or housing?

Yes

• Repair as necessary.

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

No

• Replace the mode door 1 (Floor to Panel) actuator.Then, Go to Test Step 4=> [ Test Step 4 - Run the Actuator Calibration Test ]

Test Step 4 - Run the Actuator Calibration Test

• Turn the ignition ON.

• With the scan tool, select system tests and then select actuator calibration test. When the test is complete, select view DTCs.

Does the scan tool display this DTC as active?

Yes

• Replace the A/C heater control.

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

No

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