Inspection and Verification
- Verify the customer concern by operating the climate control system to duplicate the condition.
- Visually inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION CHART
Mechanical Electrical - Loose, missing or damaged A/C compressor drive belt
- Loose or disconnected A/C clutch
- Discharged A/C system
- Broken or leaking refrigerant lines
- Central junction box (CJB) fuse(s):
- 36 (7.5A)
- 45 (7.5A)
- Battery junction box (BJB) fuse(s):
- 8 (30A)
- 19 (40A)
- 21 (20 A)
- Blower motor inoperative
- A/C compressor inoperative
- Circuitry open/shorted
- Disconnected, loose fitting or incorrectly installed electrical connectors and pins
- As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting or incorrectly installed component, module or in-line electrical connectors and pins.
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect a diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- Check that the program card is correctly installed.
- Check the connections to the vehicle.
- Check the ignition switch position.
- If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.