Volvo C30 2007 Service And Repair Manual page 544

INSTALLING THE COMBUSTION PREHEATER MODULE (CPM)
Install the switch so that it is properly secured.
Position the control module. Ensure that the control module housing goes correctly into the grooves at the top
edge.
Tighten the 4 screws crosswise.
Install the engine coolant heater. See: FUEL FIRED BOOSTER HEATER (B5244S4)
FINISHING
FINAL CHECK OF THE ENGINE COOLANT HEATER
Test run the engine coolant heater and check its function. See: FUEL-POWERED PREHEATER,
CHECKING
Check that no diagnostic trouble codes (DTCs) have been stored while the repair was carried out.
FUEL FIRED BOOSTER HEATER CONTROL UNIT (B5254T3, B5254T7)
NOTE: The illustrations in this service information are used for different model years
and/or models. Some variation may occur. However, the essential information in
the illustrations is always correct.
PREPARATORY WORK
REMOVING THE ENGINE COOLANT HEATER
Remove the engine coolant heater. See: FUEL FIRED BOOSTER HEATER (B5254T3, B5254T7)
IMPORTANT INFORMATION
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)
2012 Volvo C30 T-5
HVAC Climate Units - Removal, Replacement And Installation