Volvo C30 2007 Service And Repair Manual page 543

If the combustion preheater module (CPM) is to be moved from one vehicle to another, note down any
diagnostic trouble codes (DTCs) and operating times before removing the control module from the vehicle.
Always check that the pins or sockets in the control module connectors are not bent or damaged. This might be
the cause of the fault.
REMOVAL
REMOVING THE COMBUSTION PREHEATER MODULE (CPM)
Fig. 159: Identifying Combustion Preheater Module (CPM) Screws
Courtesy of VOLVO CARS CORPORATION
Slacken off the 4 screws. See the illustration.
Carefully pull the combustion preheater module (CPM) straight out to access the connector.
Position a small screwdriver between the control module connector and its 2 catches. Turn the screwdriver
carefully to release the catches.
Pull off the control module.
INSTALLATION
2012 Volvo C30 T-5
HVAC Climate Units - Removal, Replacement And Installation