Brake Lamps

Brake Lamps

The LCM (C2040) monitors the condition of the brake pedal via the brake pedal switch (C0075) on a UR wire. When the brake pedal is pressed, the switch contacts close and an earth path is created on an NB wire. Sensing this, the LCM (C0937) provides a feed to the following on BU wires:

The RH brake lamp (C0125) The LH brake lamp (C0121) The Centre High Mounted Stop Lamp (CHMSL) (C0613).

All are earthed on N wires.

When HDC is functioning, the ABS ECU (C0506) outputs a signal to the LCM (C2040) on a YN wire. When the LCM receives this signal, it operates the brake lamps as described above. For more information on ABS operation, refer to the Anti-Lock Braking System (ABS) section of this manual, and the Brakes section of the System Description and Operation Workshop manual.  ANTI-LOCK BRAKING SYSTEM (ABS).

Reverse Lamps

When reverse gear is selected, a message is sent from the Electronic Automatic Transmission (EAT) ECU (C1835) to the Engine Control Module (ECM) (C0604) via the CAN Bus on YN (low) and YB (high) wires. This message is relayed from the ECM (C0331) to the instrument pack (C0234) via the CAN Bus on YN (low) and YB (high) wires

When the instrument pack receives this message, it outputs a signal to the LCM (C2040) via the I Bus on a WSY wire. When the LCM (C2039) receives a reverse gear selected signal, it provides a feed to the following on WY wires:

The RH reverse lamp (C0455) The LH reverse lamp (C0472).

Both lamps are earthed on N wires.