Pinpoint Test I: Air Inlet Door Is Inoperative
Climate Control System
Pinpoint Test I: Air Inlet Door is Inoperative
Normal Operation
The HVAC module supplies ground to the air inlet door actuator motor through the recirc open circuit to rotate the air inlet door actuator 180 degrees to the outside air position, or the recirc close circuit to rotate the air inlet door actuator another 180 degrees to the recirculated air position. Voltage is supplied to the air inlet door actuator.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet mode door actuator
- HVAC module
- Air inlet mode door binding or stuck
- Front Controls Interface Module (FCIM)
PINPOINT TEST I : AIR INLET DOOR IS INOPERATIVE
I1 CHECK THE AIR INLET MODE DOOR ACTUATOR OPERATION USING ACTIVE COMMANDS
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- HVAC Module PID (A/C Recirculating Servo Position Status (RECIRC_DPOS)).
- Select PANEL mode on the HVAC controls.
- Select the highest blower motor setting.
- Observe airflow noise while using the scan tool to operate the HVAC module active command RECIRC_DPOS between Fresh Air and RECIRC.
Does the airflow noise change when the active command is changed?
Yes
INSTALL a new Front Controls Interface Module (FCIM). TEST the system for normal operation.
No
GO to I2.
I2 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module- Electronic Manual Temperature Control (EMTC) C2357.
- Disconnect: HVAC Module- Dual Automatic Temperature Control (DATC) C228A.
- Disconnect: Air Inlet Door Actuator C2363.
- Ignition ON.
- For EMTC (Electronic Manual Temperature Control) systems
For EMTC (Electronic Manual Temperature Control) systems, measure the voltage between ground and:
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-2, circuit CH207 (BU/GY), harness side.
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit CH208 (GN/OG), harness side.
- For DATC (Dual Automatic Temperature Control) systems
For DATC (Dual Automatic Temperature Control) systems, measure the voltage between ground and:
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-2, circuit CH207 (BU/GY), harness side.
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, circuit CH208 (GN/OG), harness side.
Is any voltage present?
Yes
GO to I3.
No
REPAIR circuit CH207 (BU/GY)/(BN) or CH208 (GN/OG)/(GN) for a short to voltage. TEST the system for normal operation.
I3 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- For EMTC (Electronic Manual Temperature Control) systems
For EMTC (Electronic Manual Temperature Control) systems, measure the resistance between ground and:
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-2, circuit CH207 (BU/GY), harness side.
- HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit CH208 (GN/OG), harness side.
- For DATC (Dual Automatic Temperature Control) systems
For DATC (Dual Automatic Temperature Control) systems, measure the resistance between ground and:
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-2, circuit CH207 (BU/GY), harness side.
- HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, circuit CH208 (GN/OG), harness side.
Are the resistances greater than 10,000 ohms?
Yes
GO to I4.
No
REPAIR circuit CH207 (BU/GY)/(BN) or CH208 (GN/OG)/(GN) for a short to ground. TEST the system for normal operation.
I4 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
- For EMTC (Electronic Manual Temperature Control) systems
For EMTC (Electronic Manual Temperature Control) systems, measure the resistance between HVAC module- EMTC (Electronic Manual Temperature Control) C2357-2, circuit CH207 (BU/GY), harness side and HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit CH208 (GN/OG), harness side.
- For DATC (Dual Automatic Temperature Control) systems
For DATC (Dual Automatic Temperature Control) systems, measure the resistance between HVAC module- DATC (Dual Automatic Temperature Control) C228A-2, circuit CH207 (BU/GY), harness side and HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, circuit CH208 (GN/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to I5.
No
REPAIR circuit CH207 (BU/GY)/(BN) and CH208 (GN/OG)/(GN) for a short together. TEST the system for normal operation.
I5 CHECK THE AIR INLET MODE DOOR ACTUATOR FOR VOLTAGE
NOTE: Access to the connector in the following step is difficult. Before carrying out this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Ignition ON.
- Measure the voltage between ground and air inlet door actuator C2363-7, circuit (GY), harness side.
Is the voltage greater than 10 volts?
Yes
VERIFY Body Control Module (BCM) fuse 37 (10A) is OK. If OK, REPAIR circuit CBP37 (WH)/(GY) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If not
OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short [1][2]Diagrams By Number.
No
GO to I6.
I6 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C2357-2, circuit CH207 (BU/GY), harness side and air inlet door actuator C2363-1, circuit (BN), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- DATC (Dual Automatic Temperature Control) C228A-2, circuit CH207 (BU/GY), harness side and air inlet door actuator C2363-1, circuit (BN), harness side.
- Measure the resistance between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit CH208 (GN/OG), harness side and air inlet door actuator C2363-3, circuit (GN), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- DATC (Dual Automatic Temperature Control) C228A-3, circuit CH208 (GN/OG), harness side and air inlet door actuator C2363-3, circuit (GN), harness side.
Are the resistances less than 5 ohms?
Yes
GO to I7.
No
REPAIR circuit CH207 (BU/GY)/(BN) or CH208 (GN/OG)/(GN) for an open. TEST the system for normal operation.
I7 CHECK THE AIR INLET MODE DOOR ACTUATOR OPERATION
NOTE: If a jumper fuse opens while carrying out this test step, repair the circuits for a short to voltage.
- Connect: Air Inlet Door Actuator C2363.
- Ignition ON.
- Carry out the following steps while observing the air inlet door through the glove compartment door opening.
- NOTE: This step positions the actuator for the following steps.
Connect a fused jumper wire between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C2357-10, circuit GD115 (BK/GY), harness side and HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-2, circuit CH207 (BU/GY), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C228A-10, circuit GD115 (BK/GY), harness side and HVAC Module- EMTC (Electronic Manual Temperature Control) C228A-2, circuit CH207 (BU/GY), harness side.
- Remove the fused jumper wire.
- Connect a fused jumper wire between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C2357-10, circuit GD115 (BK/GY), harness side and HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-3, circuit CH208 (GN/OG), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C228A-10, circuit GD115 (BK/GY), harness side and HVAC Module- EMTC (Electronic Manual Temperature Control) C228A-3, circuit CH208 (GN/OG), harness side.
- Remove the fused jumper wire.
- Connect a fused jumper wire between:
- For EMTC (Electronic Manual Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C2357-10, circuit GD115 (BK/GY), harness side and HVAC Module- EMTC (Electronic Manual Temperature Control) C2357-2, circuit CH207 (BU/GY), harness side.
- For DATC (Dual Automatic Temperature Control) systems, HVAC module- EMTC (Electronic Manual Temperature Control) C228A-10, circuit GD115 (BK/GY), harness side and HVAC Module- EMTC (Electronic Manual Temperature Control) C228A-2, circuit CH207 (BU/GY), harness side.
Does the air inlet door open and close?
Yes
GO to I9.
No
INSPECT for binding or broken linkage. REPAIR linkage as necessary. If no condition is found, GO to I8.
I8 CHECK THE AIR INLET MODE DOOR ACTUATOR CONNECTION
- Disconnect the air inlet mode door actuator connector.
- Inspect the air inlet door actuator component and harness side connectors for:
- corrosion
- damaged pins
- pushed-out terminals
- Connect and correctly seat the actuator connector.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test- HVAC Module.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new actuator. 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.
I9 CHECK THE HVAC MODULE CONNECTION
- Inspect the HVAC module component and harness side connectors for:
- corrosion
- damaged pins
- pushed-out terminals
- Connect and correctly seat all the HVAC module connectors.
- Enter the following diagnostic mode on the scan tool: Self-Test- HVAC Module.
- Operate the system and verify the concern is still present.
Is the concern still present?
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.