| E537 | Immediate heat button |
| J126 | Fresh air blower control unit |
| J255 | Climatronic control unit |
| SC22 | Fuse -22-, in fuse holder |
| T6z | 6-pin connector, on fresh air blower control unit |
| T10e | 10-pin connector, behind right dash panel |
| T16l | 16-pin connector, at climatronic control unit (brown) |
| T20g | 20-pin connector, at climatronic control unit (black) |
| V2 | Fresh air blower |
| 617 | Earth point -2-, on lower part of right A-pillar |
| B397 | Connection -1- (CAN H, convenience), in interior wiring harness |
| B406 | Connection -1- (CAN L, convenience), in interior wiring harness |
| J364 | Additional heater control unit |
| N279 | Heater coolant shut-off valve |
| SB11 | Fuse -11-, in the E box |
| T2j | 2-pin connector, at additional heater control unit |
| T8v | 8-pin connector, at additional heater control unit |
| T40a | 40-pin connector, at the E box |
| V54 | Metering pump |
| 13 | Earth point, on right in engine compartment (at longitudinal member) |
| 167 | Earth connection -4-, in engine compartment wiring harness |
| 373 | Earth connection -8-, in interior wiring harness |
| * | only on some vehicles, depending upon the engine identification character |
| J364 | Additional heater control unit |
| N279 | Heater coolant shut-off valve |
| SB30 | Fuse -30-, in the E box |
| T2j | 2-pin connector, at additional heater control unit |
| T8v | 8-pin connector, at additional heater control unit |
| T40a | 40-pin connector, at the E box |
| V54 | Metering pump |
| 13 | Earth point, on right in engine compartment (at longitudinal member) |
| 167 | Earth connection -4-, in engine compartment wiring harness |
| 373 | Earth connection -8-, in interior wiring harness |
| * | only on some vehicles, depending upon the engine identification character |
| G18 | Temperature sensor |
| G189 | Overheating sensor |
| J364 | Additional heater control unit |
| Q8 | Glow plug with flame monitor |
| T2k | 2-pin connector, at additional heater control unit |
| T3d | 3-pin connector, at additional heater control unit |
| T4e | 4-pin connector, at additional heater control unit |
| T8w | 8-pin connector, at additional heater control unit |
| V6 | Combustion air blower |
| V55 | Circulation pump |
| Z66 | Preheating heater element |
| * | for diesel engines |
| J119 | Multi-function display |
| J285 | Control unit in dash panel insert |
| J364 | Additional heater control unit |
| J533 | Data bus diagnostic interface, below dash panel, centre |
| K | Dash panel insert |
| T8v | 8-pin connector, at additional heater control unit |
| T20c | 20-pin connector, at data bus diagnostic interface |
| T36a | 36-pin connector, at dash panel insert |
| A178 | Connection (CAN H, infotainment), in dash panel insert wiring harness |
| A179 | Connection (CAN L, infotainment), in dash panel insert wiring harness |
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