Pinpoint Test C: The Air Inlet Mode Door Is Inoperative
Climate Control System
Pinpoint Tests
Pinpoint Test C: The Air Inlet Mode Door is Inoperative
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the air inlet mode door actuator motor is supplied voltage or ground on circuit 1116 (DG), depending on desired actuator rotation, by the HVAC module. The HVAC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit 1117 (LG).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet mode door actuator
- HVAC module
- Stuck or bound linkage or door
PINPOINT TEST C: THE AIR INLET MODE DOOR IS INOPERATIVE
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C1 CHECK THE AIR INLET MODE DOOR ACTUATOR CLOCKWISE OPERATION
- Disconnect: HVAC Module C294a.
- Remove the door actuator and disengage the actuator driveshaft from the actuator door.
- Mark the door actuator driveshaft position.
- Connect a fused jumper wire between:
- HVAC module C294a-8, circuit 1116 (DG), harness side and C294a-1, circuit 1205 (BK), harness side.
- HVAC module C294a-9, circuit 1117 (LG), harness side and C294a-26, circuit 1566 (RD/YE), harness side.
- Does the actuator motor move in the clockwise direction?
Yes
GO to C2.
No
GO to C3.
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C2 CHECK THE AIR INLET MODE DOOR ACTUATOR COUNTERCLOCKWISE OPERATION
- Connect a fused jumper wire between:
- HVAC module C294a-8, circuit 1116 (DG), harness side and C294a-26, circuit 1566 (RD/YE), harness side.
- HVAC module C294a-9, circuit 1117 (LG), harness side and C294a-1, circuit 1205 (BK), harness side.
- Does the actuator motor move in the counterclockwise direction?
Yes
INSPECT for binding or broken door and linkage. If no condition is found, GO to C9.
No
GO to C3.
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C3 CHECK CIRCUIT 1116 (DG) FOR A SHORT TO GROUND
- Disconnect: Air Inlet Mode Door Actuator C2325.
- Measure the resistance between ground and HVAC module C294a-8, circuit 1116 (DG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to C4.
No
REPAIR circuit 1116 (DG) for a short to ground. TEST the system for normal operation.
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C4 CHECK CIRCUIT 1117 (LG) FOR A SHORT TO GROUND
- Measure the resistance between ground and HVAC module C294a-9, circuit 1117 (LG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to C5.
No
REPAIR circuit 1117 (LG) for a short to ground. TEST the system for normal operation.
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C5 CHECK CIRCUIT 1116 (DG) FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between ground and HVAC module C294a-8, circuit 1116 (DG), harness side.
- Is any voltage present?
Yes
REPAIR circuit 1116 (DG) for a short to voltage. TEST the system for normal operation.
No
GO to C6.
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C6 CHECK CIRCUIT 1117 (LG) FOR A SHORT TO VOLTAGE
- Measure the voltage between ground and HVAC module C294a-9, circuit 1117 (LG), harness side.
- Is any voltage present?
Yes
REPAIR circuit 1117 (LG) for a short to voltage. TEST the system for normal operation.
No
GO to C7.
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C7 CHECK CIRCUIT 1116 (DG) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between HVAC module C294a-8, circuit 1116 (DG), harness side and air inlet mode door actuator C2325-1, circuit 1116 (DG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C8.
No
REPAIR circuit 1116 (DG) for an open. TEST the system for normal operation.
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C8 CHECK CIRCUIT 1117 (LG) FOR AN OPEN
- Measure the resistance between HVAC module C294a-9, circuit 1117 (LG), harness side and air inlet mode door actuator C2325-6, circuit 1117 (LG), harness side.
- Is the resistance less than 5 ohms?
Yes
INSPECT for binding or broken linkage. If no condition is found, INSTALL a new air inlet mode door actuator. TEST the system for normal operation.
No
REPAIR circuit 1117 (LG) for an open. TEST the system for normal operation.
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C9 CHECK THE MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- Operate the system.
- Does the concern return?
Yes
INSTALL a new HVAC module. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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