B1045

B1045-PANEL MODE DOOR 1 TRAVEL RANGE TOO LARGE (ATC)

Theory of Operation
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 is greater than the expected range for this actuator, this DTC will set.

WHEN MONITORED
During actuator calibration.

SET CONDITION
If the total span of the Mode Door exceeds the high range limit.

POSSIBLE CAUSES
- Mode door or A/C heater housing components warped, worn, damaged, missing, broken
- Mode door actuator
- A/C heater control

DIAGNOSTIC TEST

1. CHECK FOR A BROKEN MODE DOOR ACTUATOR
Turn the ignition off.
Remove the Mode Door Actuator from the A/C Heater Housing Assembly.
By hand, attempt to rotate the actuator in both directions.

Q: Does the actuator turn in either direction?

YES: Replace the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. CHECK MODE DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & 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 240 degrees.

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

YES: Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Mode Door Actuator. Then, Go To 3.

3. RUN ACTUATOR CALIBRATION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
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.

Q: Does the scan tool display: B1045-PANEL MODE DOOR 1 TRAVEL RANGE TOO LARGE?

YES: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Perform BODY VERIFICATION TEST - VER 1. Body Verification Test