Climate Control System

Inspection and Verification

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTE:
Prior to any testing or inspection, the vehicle should be check for any relevant warning lamps being illuminated. If a warning lamp is illuminated, check for DTCs and refer to the relevant DTC Index, if no warning lamp is illuminated, continue with diagnostic procedures below.
1 Verify the customer concern.
2 Visually inspect for obvious signs of mechanical or electrical damage.





3 Listen for any unusual noises during climate control system operation.
4 Inspect the refrigerant system with an ultraviolet (UV) lamp for traces of UV sensitive leak trace dye.
5 If the cause is not visually evident, check Climate Control Module, Engine Control Module (ECM), Fuel Fired Booster Heater and Central Junction Box (CJB) for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.
6 If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
7 Where possible, use the approved diagnostic system or a scan tool to retrieve any DTCs before moving onto the symptom chart or DTC index.
- Because the DTCs are stored in more than one module, a complete vehicle read is recommended.
- Make sure that all DTCs are cleared following rectification.

DTC Index
For a complete list of all diagnostic trouble codes that could be logged on this vehicle, please refer to Vehicle / A L L Diagnostic Trouble Codes ( DTC ). For additional information, refer to Diagnostic Trouble Code (DTC) Index - DTC: Climate Control Module (HVAC) Testing and Inspection
For additional information, refer to Diagnostic Trouble Code (DTC) Index - DTC: Fuel Fired Booster Heater Module (AHCM)