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)
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A/C Request Signal
This signal is transmitted two different ways depending on the content option, the first is communicated Class II from the HVAC Controller to the
PCM that an A/C mode is selected (CJ2). The second is a
12 volt signal from the HVAC Controller to the PCM, the
12.0 volt signal indicates that an A/C mode is selected (CJ3, C60). 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 (CJ3, C60) or PCM Controlled A/C Circuit Diagnosis (CJ2) 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 HVAC should be used.