Pinpoint Test K: Air Conditioning (A/C) and Recirc Modes Are Inoperative
Climate Control System
Pinpoint Tests
Pinpoint Test K: Air Conditioning (A/C) and Recirc Modes Are Inoperative
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, when the blower motor switch is in any position except OFF, a ground is provided to the Instrument Cluster (IC) blower motor switch input. When the IC receives this ground, it enables the inputs for the A/C and air inlet mode switches.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- IC
PINPOINT TEST K: AIR CONDITIONING (A/C) AND RECIRC MODES ARE INOPERATIVE
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K1 CHECK THE BLOWER FUNCTION
- Ignition ON.
- Place the blower motor switch in the lowest setting.
- Does the blower motor operate?
Yes
GO to K2.
No
GO to Pinpoint Test H. Pinpoint Test H: The Air Conditioning (A/C) Is Inoperative - Defrost and Floor/Defrost Modes Only
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K2 CHECK CIRCUIT 31S-FA26 (BK/RD) FOR GROUND
- Ignition OFF.
- Disconnect: IC C220A .
- Ignition ON.
- Place the blower motor switch in the lowest setting.
- Measure the resistance between IC C220A-22, circuit 31S-FA26 (BK/RD), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to K3.
No
REPAIR circuit 31S-FA26 (BK/RD) for an open. TEST the system for normal operation.
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K3 CHECK THE IC CONNECTION
- Clear the DTCs.
- Disconnect all the IC connectors.
- Check for:
- corrosion.
- pushed-out pins.
- incorrectly seated connector.
- Connect and correctly seat all the IC connectors.
- Operate the system.
- Does the concern return?
Yes
INSTALL a new IC. REFER to Instrument Panel, Gauges and Warning Indicators. 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.
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