System Description

SYSTEM


DAYTIME RUNNING LIGHT SYSTEM : System Description


OUTLINE
- Turns the headlamp high ON (high beam at approximately half illumination) as the daytime running light.
- Daytime running light is controlled by daytime running light control function and combination switch reading function of BCM, and relay control function of IPDM E/R.

DAYTIME RUNNING LIGHT OPERATION
- BCM detects the combination switch condition by the combination switch reading function.
- BCM detects the engine condition according to push-button ignition switch*1
- BCM detects the engine condition by the engine status signal received from ECM using CAN communication*2.
- BCM detects the parking brake condition by the parking brake switch signal received from combination meter using CAN communication.
- BCM transmits the daytime running light request signal to IPDM E/R using CAN communication according to the daytime running light ON condition.

Daytime running light ON condition
- Engine running
- Lighting switch OFF or 1ST
- Parking brake switch OFF
- IPDM E/R controls the daytime running light relay-2 (ground-side) to turn ON according to the daytime running light request signal.
- Power is supplied from the daytime running light relay 2 through headlamp high (RH) and IPDM E/R to headlamp high (LH). And high beam headlamps are illuminated (approximately half illumination) as the daytime running light.

*1: Only for models with Intelligent Key system
*2: Only for models without Intelligent Key system

NOTE:
- Daytime running light relay 1 is turned ON when headlamp is low.
- Daytime running light relay 1 is OFF to cut voltage of headlamp low circuit when daytime running light is ON.