Operation CHARM: Car repair manuals for everyone.
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

Range: Yes/No
The BCM uses this input in determining whether air conditioning (A/C) is being requested from the HVAC selector. This input is sent out over the class 2 serial data line to the following locations:
^ The PCM
^ The data link connector (DLC)

YES is displayed when the A/C is being requested. NO is displayed when the A/C is not being requested. Note that A/C being requested does not mean that the A/C clutch is engaged. Other variables must be met for the BCM and the PCM to engage the compressor clutch.