| A | Battery |
| G18 | Temperature sensor |
| J162 | Heater control unit |
| J248 | Diesel direct injection system control unit |
| Q8 | Glow plug with flame monitor |
| S24 | Heater overheating fuse |
| S62 | Auxiliary heater fuse |
| T2at | 2-pin connector, black, on auxiliary heater control unit |
| T6z | 6-pin connector, on auxiliary heater control unit |
| T10n | 10-pin connector, orange, connector point, electronics box, plenum chamber |
| T15m | 15-pin connector, white, connector point, A pillar, left |
| T15u | 15-pin connector, red, connector point, electronics box, plenum chamber |
| V6 | Combustion air blower |
| V54 | Metering pump |
| V55 | Recirculating pump |
| 1 | Earth strap, battery - body |
| 44 | Earth point, lower part of left A-pillar |
| L51 | Positive (+) connection -1-, in auxiliary heater wiring harness |
| * | Models with V6 TDI engine |
| E9 | Fresh air blower switch |
| J8 | Auxiliary heater relay |
| J13 | Fresh air blower (auxiliary heater) relay |
| J214 | Thermotronic control unit |
| J347 | Ultra-sonic sensor control unit |
| N6 | Series resistor |
| N24 | Fresh air blower with overheating fuse series resistor |
| S244 | Fuse in fuse box |
| T3z | 3-pin connector, white, connector point left A-pillar |
| T3bv | 3-pin connector, orange, connector point, A pillar, right |
| V2 | Fresh air blower |
| 44 | Earth point, lower part of left A-pillar |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 199 | Earth connection -3-, in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A78 | Connection (30a, S244), in dash panel wiring harness |
| * | Both possible |
| D | Ignition/starter switch |
| E15 | Heated rear window switch |
| J214 | Thermotronic control unit |
| S5 | Fuse in fuse box |
| S226 | Fuse 26 in fuse box |
| T6a | 6-pin connector, blue, connector point, A pillar, left |
| Z1 | Heated rear window |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A20 | Connection (15a), in dash panel wiring harness |
| L14 | Connection (75al), in auxiliary heater wiring harness |
| E272 | Function selection switch II, in centre console |
| J218 | Combi-processor in dash panel insert |
| K | Diagnosis connection |
| T16a | 16-pin connector, diagnosis connection |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| T32c | 32-pin connector, grey, on dash panel insert |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| A19 | Connection (58s), in dash panel wiring harness (switch illumination) |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
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