| E184 | Fresh air and recirculating air switch |
| J484 | Fresh air blower and air recirculation relay, control number (114) |
| K114 | Fresh air/air recirculation warning lamp |
| L16 | Fresh air controls light bulb |
| N24 | Fresh air blower with overheating fuse series resistor |
| S24 | Heater overheating fuse (8 Amp.)/air conditioner compressor |
| T2 | 2-pin connector |
| T3c | 3-pin connector |
| T4a | 4-pin connector |
| T8d | 8-pin connector |
| V2 | Fresh air blower |
| 32 | Earth point, behind dash panel, left |
| 33 | Earth point, behind dash panel, right |
| 305 | Earth connection (additional heater), in interior wiring harness |
| B102 | Earth connection, in front left interior wiring harness |
| B176 | Positive (+) connection (fresh air blower,), in interior wiring harness |
| D | Ignition/starter switch |
| E111 | Pre-selection clock, in roof |
| L75 | Digital display illumination |
| S200 | Fuse -2- (15), No. 3 in fuse box |
| S205 | Fuse -2- (30), No. 12 in fuse box |
| T8e | 8-pin connector, behind left A pillar/dash panel trim |
| Y2 | Digital clock |
| 71 | Earth point, front roof rail |
| 128 | Earth connection -1-, in interior light wiring harness |
| B135 | Connection -1- (15a), in interior wiring harness |
| B145 | Positive (+) connection (58b), in interior wiring harness |
| B163 | Positive (+) connection -1- (15), in interior wiring harness |
| B170 | Positive (+) connection -2- (30), in interior wiring harness |
| * | Only engine codes AHU, AFN |
| A | Battery |
| A1 | Second battery, under front right seat |
| C | Alternator |
| J7 | Battery cut-out relay, under front right seat |
| J162 | Heater control unit B4W/D4W, in additional heater unit |
| S61 | Fuse for sockets, under front right seat |
| S65 | 2nd battery fuse, under front right seat |
| S210 | Fuse -7- (30), No. 33 in fuse box |
| T1a | 1-pin connector |
| T8 | 8-pin connector, near additional heater unit |
| T8f | 8-pin connector, behind lower right D pillar trim |
| U5 | 12V socket, on rear left luggage compartment |
| 34 | Earth point, under driver's seat |
| 35 | Earth point, under front passenger's seat |
| 57 | Earth point, rear pillar, left |
| 296 | Earth connection -11-, in interior wiring harness |
| B109 | Earth connection, in rear left interior wiring harness |
| B111 | Positive (+) connection -1- (30a), in interior wiring harness, rear left |
| B150 | Positive (+) connection -2- (30a), in interior wiring harness |
| B177 | Connection (61), in interior wiring harness |
| B188 | Positive (+) connection -5- (30), in interior wiring harness |
| G64 | Flame monitor |
| G241 | Coolant temperature sender, heating* |
| J162 | Heater control unit B4W/D4W, in additional heater unit |
| Q9 | Glow plug for heater |
| T8 | 8-pin connector, near additional heater unit |
| T14 | 14-pin connector |
| V6 | Combustion air blower |
| V54 | Metering pump |
| 35 | Earth point, under front passenger's seat |
| 284 | Earth connection -6-, in interior wiring harness |
| B104 | Earth connection (rear right), in interior wiring harness |
| * | Is identical to 'G62 - Coolant temperature sender' when performing self-diagnosis |
| F38 | Ambient temperature switch, in plenum chamber, left, Part No. 701 959 625 |
| G189 | Overheating sensor |
| J162 | Heater control unit B4W/D4W, in additional heater unit |
| J485 | Auxiliary heater operation relay, control number (106) |
| T2a | 2-pin connector, near additional heater unit |
| T8 | 8-pin connector, near additional heater unit |
| T14 | 14-pin connector |
| 305 | Earth connection (additional heater), in interior wiring harness |
| B232 | Connection (additional heater), in interior wiring harness |
| * | Only engine codes AHU, AFN |
| A | Battery |
| J59 | X contact relief relay |
| J486 | Fresh air blower Relay, 2nd speed, control number (94) |
| N214 | Coolant circuit valve, in plenum chamber, left |
| S211 | Fuse -1- (X), No. 29 in fuse box |
| S218 | Fuse -4- (X), No. 34 in fuse box |
| T2b | 2-pin connector, near additional heater unit |
| V55 | Recirculating pump, near additional heater unit |
| 34 | Earth point, under driver's seat |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 284 | Earth connection -6-, in interior wiring harness |
| 305 | Earth connection (additional heater), in interior wiring harness |
| B138 | Positive (+) connection -1- (X), in interior wiring harness |
| B174 | Positive (+) connection -3- (X), in interior wiring harness |
| B217 | Connection (additional heater), in interior wiring harness |
