Pinpoint Test H: Air Inlet Door Is Inoperative
Climate Control System
Pinpoint Tests
Pinpoint Test H: Air Inlet Door is Inoperative
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 55, Automatic Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, to rotate the air inlet door actuator, the HVAC module supplies voltage to the air inlet door actuator motor through circuit CH208 (GN/OG), and supplies ground through circuit CH207 (BU/GY). To reverse the air inlet door actuator rotation, the HVAC module reverses the voltage and ground circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet door actuator motor
- HVAC module - Electronic Automatic Temperature Control (EATC)
- HVAC module - Dual Automatic Temperature Control (DATC)
- HVAC module - Electronic Manual Temperature Control (EMTC)
- Stuck or bound linkage or door
PINPOINT TEST H: AIR INLET DOOR IS INOPERATIVE
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H1 CHECK DOOR ACTUATOR OPERATION
NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short.
- Disconnect: HVAC Module - DATC C2356a, HVAC Module - EATC C228a or HVAC Module - EMTC C2357a.
- Observe the air inlet door actuator drive shaft.
- Ignition ON.
EMTC
- NOTE: EMTC systems only.
- Connect a fused jumper wire between:
- HVAC module - EMTC C2357a-26, circuit SBP07 (WH/RD), harness side and HVAC module - EMTC C2357a-9, circuit CH208 (GN/OG), harness side.
- HVAC module - EMTC C2357a-1, circuit GD116 (BK/VT), harness side and HVAC module - EMTC C2357a-8, circuit CH207 (BU/GY), harness side.
EATC
- NOTE: EATC systems only.
- Connect a fused jumper wire between:
- HVAC module - EATC C228a-26, circuit SBP07 (WH/RD), harness side and HVAC module - EATC C228a-9, circuit CH208 (GN/OG), harness side.
- HVAC module - EATC C228a-1, circuit GD116 (BK/VT), harness side and HVAC module - EATC C228a-8, circuit CH207 (BU/GY), harness side.
DATC
- NOTE: DATC systems only.
- Connect a fused jumper wire between:
- HVAC module - DATC C2356a-26, circuit SBP07 (WH/RD), harness side and HVAC module - DATC C2356a-8, circuit CH208 (GN/OG), harness side.
- HVAC module - DATC C2356a-1, circuit GD116 (BK/VT), harness side and HVAC module - DATC C2356a-9, circuit CH207 (BU/GY), harness side.
- Does the actuator motor rotate?
Yes
GO to H2.
No
GO to H3.
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H2 CHECK DOOR ACTUATOR OPERATION
NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short.
EMTC
- NOTE: EMTC systems only.
- Connect a fused jumper wire between:
- HVAC module - EMTC C2357a-1, circuit GD116 (BK/VT), harness side and HVAC module - EMTC C2357a-9, circuit CH208 (GN/OG), harness side.
- HVAC module - EMTC C2357a-26, circuit SBP07 (WH/RD), harness side and HVAC module - EMTC C2357a-8, circuit CH207 (BU/GY), harness side.
EATC
- NOTE: EATC systems only.
- Connect a fused jumper wire between:
- HVAC module - EATC C228a-1, circuit GD116 (BK/VT), harness side and HVAC module - EATC C228a-9, circuit CH208 (GN/OG), harness side.
- HVAC module - EATC C228a-26, circuit SBP07 (WH/RD), harness side and HVAC module - EATC C228a-8, circuit CH207 (BU/GY), harness side.
DATC
- NOTE: DATC systems only.
- Connect a fused jumper wire between:
- HVAC module - DATC C2356a-1, circuit GD116 (BK/VT), harness side and HVAC module - DATC C2356a-8, circuit CH208 (GN/OG), harness side.
- HVAC module - DATC C2356a-26, circuit SBP07 (WH/RD), harness side and HVAC module - DATC C2356a-9, circuit CH207 (BU/GY), harness side.
- Does the actuator motor reverse rotation?
Yes
INSPECT for binding or broken door and linkage. If no condition is found, GO to H4.
No
GO to H3.
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H3 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN
- Disconnect: Air Inlet Door Actuator C289.
- Measure the resistance between air inlet door actuator C289-5, circuit CH207 (BU/GY), harness side and:
NOTE: EMTC systems only.
- HVAC module - EMTC C2357a-8, circuit CH207 (BU/GY), harness side.
NOTE: EATC systems only.
- HVAC module - EATC C228a-8, circuit CH207 (BU/GY), harness side.
NOTE: DATC systems only.
- HVAC module - DATC C2356a-9, circuit CH207 (BU/GY), harness side.
- Measure the resistance between air inlet door actuator C289-6, circuit CH208 (GN/OG), harness side and:
NOTE: EMTC systems only.
- HVAC module - EMTC C2357a-9, circuit CH208 (GN/OG), harness side.
NOTE: EATC systems only.
- HVAC module - EATC C228a-9, circuit CH208 (GN/OG), harness side.
NOTE: DATC systems only.
- HVAC module - DATC C2356a-8, circuit CH208 (GN/OG), harness side.
- Are the resistances less than 5 ohms?
Yes
INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation.
No
REPAIR the circuit(s) for an open. TEST the system for normal operation.
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H4 CHECK THE MODULE CONNECTION
- Carry out the HVAC Module Cold Boot Process. HVAC Module Cold Boot Process
- NOTE: DATC/EATC systems only.
- Carry out the HVAC Module - Electronic Automatic Temperature Control (EATC) and HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test.
- 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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