Exterior Lighting - System Operation and Component Description: DRL: DRL

For vehicles equipped with daytime running/parking lamp Light Emitting Diodes (LEDs) inside the headlamp assembly, when the ignition is ON, BCM provides voltage to the headlamp and the daytime running/parking Light Emitting Diodes (LEDs) in the headlamp assembly illuminate at full intensity. Then the parking lamps or headlamps are on, the daytime running/parking Light Emitting Diodes (LEDs) in the headlamp assembly illuminate at a reduced intensity

For vehicles not equipped with daytime running/parking lamp Light Emitting Diodes (LEDs) inside the headlamp assembly, the DRL system illuminates the high beam bulbs at a reduced intensity when the ignition is on and the headlamp switch is in the OFF or AUTOLAMPS position

There are two types of DRL, conventional (where it is required) and configurable.

When equipped with conventional DRL, the DRL are active in any headlamp switch position except the HEADLAMPS position.

The conventional DRL are activated when the following conditions are met:

• the ignition is ON
• the headlamps switch is in OFF, PARKLAMPS or AUTOLAMPS position and the headlamps have not been turned on by the autolamp system.
• the transmission is not in PARK

When equipped with configurable DRL, the DRL may be enabled through the IPC message center. When enabled, the DRL are active only in the AUTOLAMPS headlamp position. When autolamps request the headlamps on, the DRL are de-activated.

The configurable DRL are activated when the following conditions are met:

• the ignition is ON.
• the headlamps switch is in AUTOLAMPS position and the headlamps have not been turned on by the autolamp system.
• the transmission is not in PARK.

The BCM also provides Field Effect Transistor (FET) protection of the DRL output circuits. When an excessive current draw is detected, the BCM disables the affected circuit driver. Refer to: Module Controlled Functions - System Operation and Component Description .