Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la or
lemon-manuals.org.ua
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A/C Request Signal
The A/C control assembly provides a
12 volt A/C request signal to the
Body Control Module (BCM). The BCM then transmits the request through the Class II serial data circuit to the
Powertrain Control Module (PCM). The PCM uses this information to adjust the
idle speed before turning on the A/C clutch. If this signal is not available to the PCM, the A/C compressor will be inoperative. Refer to PCM Controlled A/C Circuit Diagnosis for A/C clutch wiring diagrams and diagnosis of A/C clutch electrical system. When diagnosing the A/C controller and refrigerant portion of the HVAC system, the Cooling Insufficient, A/C System diagnosis in Heating, and Air Conditioning should be used.