Volvo C30 2007 Service And Repair Manual page 17

Fig. 3: Identifying Cable Terminals And Cables
Courtesy of VOLVO CARS CORPORATION
Remove:
the cable terminal and cable for the flame sensor in positions 1 and 2 (blue and brown)

the cable terminal and cable for the glow plug in positions 9 and 12 (white and brown).

2012 Volvo C30 T-5
HVAC Automatic HVAC System