DESCRIPTION AND OPERATION OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 3 and fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) provides a constant battery feed to the HRW relay and fuse 14 of the passenger compartment fuse box (C0587) on an NW wire. NOTE: Only 3 door vehicles utilise fuse 14 for HRW operation. The earth path for the HRW coil is controlled by the CCU (C0592), which is connected directly into the rear of the passenger compartment fuse box. The CCU will only provide an earth path for the relay coil if the ignition is switched on, and the engine is running. Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 8 of the passenger compartment fuse box (C0588) on a G wire. Fuse 8 provides an ignition feed to the CCU (C0593). When the CCU receives an ignition feed, it provides a feed to the HRW switch (C0072) on a GY wire. When the switch is pressed, current flows across the switch contacts (C0072) to earth on a B wire. The first of two electrical switches within the CCU will now close. When the ignition is switched on, the CCU (C0592) also provides a feed to the oil pressure switch (C0187) via the passenger compartment fuse box (C0581) on an NW then WN wire. The oil pressure switch contacts are closed when there is no oil pressure. When the engine is started, the rise in oil pressure causes the switch contacts to open. When the switch contacts open, the second electrical switch within the CCU closes. When both electrical switches within the CCU are closed, the CCU (C0592) provides an earth path for the HRW relay coil via the passenger compartment fuse box (C0587) on a B wire. The energised HRW relay provides a feed to fuse 23, which is also located in the passenger compartment fuse box. Fuse 23 (C0583) provides a feed to the HRW element (C0381) on an N wire. The HRW element (C0382) is earthed on a B wire. Fuse 23 (C0580) also provides a feed to the switch illumination LED (C0072) on an NG wire. The LED (C0072) is earthed on a B wire. The CCU will de-energise the HRW relay by removing its earth path after approximately 15 minutes has elapsed, or if the ignition is switched off.
FREELANDER 02MY
4.103
