Exterior Lighting - System Operation and Component Description: DRL
DRL
System Diagram
Network Message Chart
BCM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Gear lever position | PCM | Indicates the gear selector lever position to the BCM. When the selector lever is in any position other than park, the BCM activates the DRL. |
DRL
For halogen headlamps not equipped with LED signature/front parking lamps, the DRL system utilizes the existing circuitry and components from the headlamp low beam system.
For halogen headlamps equipped with LED signature/front parking lamps and LED headlamps, the DRL system operates the signature/park lamp Light Emitting Diodes (LEDs) at full intensity. The BCM supplies voltage to the LED control module. When the BCM supplies voltage through the DRL circuit to the LED control module, the LED control module illuminates the signature/park lamp Light Emitting Diodes (LEDs) at full intensity.
The BCM monitors the ignition status, the headlamp switch and autolamp status.
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.
When the transmission is in not in PARK, the PCM sends a message over the HS-CAN1 to the BCM indicating the transmission is not in PARK.