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
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
Or, hide this message:
temporarily or
permanently
A/C Request Signal
This signal is transmitted through a
12 volt signal from the Front (C60) HVAC Controller to the
PCM, the
12.0 volt signal indicates that an A/C mode is selected. 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 refrigerant portion of the HVAC system, the Cooling Insufficient, A/C System diagnosis in Heating and Air Conditioning should be used.