The brake lamps illuminate when the ignition switch is turned to position II, and the brake pedal is pressed. The reverse lamps illuminate when the ignition switch is in position II, and the gear selector lever is in the reverse gear position.
Operation
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the under seat fuse box (C0632) on an N wire. Fusible link 5 (C0570) is connected to the ignition switch (C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 13 and fuse 14 of the passenger compartment fuse box (C0580) on a W wire.
Brake Lamps
Fuse 13 of the passenger compartment fuse box (C0580) provides an ignition feed to the brake pedal switch (C1038 on LHD, C0075 on RHD) on a GO wire. The brake pedal switch is a normally open switch. When the brake pedal is pressed, the switch contacts close, allowing current to flow from the switch (C1727 on LHD, C0029 on RHD) to the following on GP wires:
Defender 90 and 110
- The LH brake lamp (C0121)
- The RH brake lamp (C0125)
- The Centre High Mounted Stop Lamp (CHMSL) (C0832)
- The trailer socket (C0499).
Defender 130
All are earthed on B wires.
Td5 Vehicles Only
When the brake pedal is pressed, a feed is also provided to the Engine Control Module (ECM) (C0658) on a GP wire. The ECM uses this signal to help control fuelling requirements for the engine.
Reverse Lamps
Fuse 14 of the passenger compartment fuse box (C0580) provides an ignition feed to the reverse lamp switch (C0167) on an LGP then GY wire. The reverse lamp switch is a normally open switch. When reverse gear is selected, the switch contacts close, allowing current to flow from the switch (C0167) to the following:
Defender 90 and 110
- The LH reverse lamp (C0472 on LHD, C2122 on RHD) on a GN then W wire
- The trailer socket (C0942) on a GN wire.
Defender 130
All are earthed on B wires.