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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Auxiliary Cabin Heater Control Module: Testing and Inspection






Downloading software and replacing the control module

Replacing the control module
New software can be downloaded into the combustion preheater module (CPM). When software is ordered the software and hardware of the vehicle are compared with Volvo's central database. If the comparison corresponds then the software is downloaded into the control module.
If the comparison between the car and Volvo's central database does not correspond, then the database is updated with the vehicle's configuration. When this is complete the software is downloaded.
During a total reload of vehicle software, you must select CAN network reload.

Add accessory
The following functions can be ordered to expand functionality:
- auxiliary heater
- parking heater
- upgrade to parking heater from auxiliary heater