Battery Backed-Up Sounder (BBUS)

Battery Backed-Up Sounder (BBUS)

Fuse 6 of the under seat fuse box (C0574) provides a constant battery feed to the BBUS (C0666) on a PN then B wire. The BBUS (C0666) is earthed on a B wire.

The anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) provides a battery voltage feed to the BBUS (C0666) on an OW then B wire. If the alarm is triggered, the anti-theft alarm ECU withdraws the feed and replaces it with an earth. By pulsing the feed/earth path, the anti-theft alarm ECU can control the operation of the BBUS. The anti-theft alarm ECU will re-introduce a permanent feed to the BBUS after approximately 4.5 minutes, or if the ignition is switched on. Fuse 8 of the passenger compartment fuse box (C0580) provides an ignition feed to the BBUS (C0666) on a WG then B wire.

NOTE: The BBUS is not fitted in all markets.

Alarm Sounder

Fuse 6 of the under seat fuse box (C0574) provides a constant battery feed to the alarm relay (C0731) on a PN wire. The earth path for the relay coil is controlled by the anti-theft alarm ECU (C1980 on LHD, C0057 on RHD). The anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) provides a battery voltage feed to the alarm relay coil (C0731) on an OW wire. To energise the relay, the anti-theft alarm ECU withdraws the feed and replaces it with an earth. Battery voltage from fuse 6 is now able to flow across the closed relay contacts (C0731) to the sounder (C0520) on an OB wire. The sounder (C0520) is earthed on a B wire. By pulsing the feed/earth path to the alarm relay, the anti-theft alarm ECU can control the operation of the sounder.

NOTE: The alarm sounder is not fitted in all markets.

Horns

Fuse 6 of the under seat fuse box (C0574) provides a constant battery feed to the alarm relay (C0731) on a PN wire. The earth path for the relay coil is controlled by the anti-theft alarm ECU (C1980 on LHD, C0057 on RHD). The anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) provides a battery voltage feed to the alarm relay coil (C0731) on an OW wire. To energise the relay, the anti-theft alarm ECU withdraws the feed and replaces it with an earth. Battery voltage from fuse 6 is now able to flow across the closed relay contacts (C0731) to fuse 27 of the passenger compartment fuse box (C0581) on an OR wire. Fuse 27 (C0581) provides a feed to the LH horn (C0003) and the RH horn (C0004) on PB wires. By pulsing the feed/earth path to the alarm relay, the anti-theft alarm ECU can control the operation of the horns.