DESCRIPTION AND OPERATION OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 5, and the main relay (C0632) on an R wire. All are located within the engine compartment fuse box. The earth path for the main relay coil (C0576 on K Series vehicles, C0578 on KV6 vehicles) is controlled by the Engine Control Module (ECM) (C0913 on K Series vehicles, C0371 on KV6 vehicles) on a WK wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. For more details on main relay operation, refer to the Engine Management Systems – MEMS or Engine Management Systems – Siemens (All Except NAS) section of the System Description and Operation Workshop manual. Fusible link 1 is connected in series with fuse 8, fuse 9 and fusible link 2, which are also located in the engine compartment fuse box. Fuse 8 (C0576) provides a constant battery feed to the blower relay (C0153) on a GN then GW wire. Fuse 9 provides a constant battery feed to the compressor clutch relay, which is also located in the engine compartment fuse box. Fusible link 2 (C0571) is connected to the ignition switch (C0028) by an NR wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch to fuse 4 of the passenger compartment fuse box (C0588) on an SU wire. Fuse 4 (C0586) provides an ignition feed to following on G then LGS wires: l The blower motor switch (C0058). l The fresh/recirculated air switch (C0750). l The fresh/recirculated air motor (C0006). A/C Master Switch When the blower switch (C0058) is turned to position 1 or higher, it provides a feed to the A/ C master switch (C0275) on an SW wire. If A/C is requested, the switch (C0275) provides a feed to the instrument pack (C0233) on an SK wire. When the instrument pack receives an A/C request from the switch, it informs the ECM (C0913 K Series vehicles, C0371 on KV6 vehicles) via the CAN BUS on YN (Low) and YB (High) wires. The A/C master switch is mounted on the centre console, and is earthed (C0275) on a B wire. For more information on CAN BUS operation, refer to the Communication Databuses section of the System Description and Operation Workshop manual.
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