Daytime Running Lamp: Description and Operation

DAYTIME RUNNING LIGHT SYSTEM

System Diagram






System Description

OUTLINE
- Turns the front fog lamp ON 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 vehicle condition depending on the following signals.
- Engine condition signal (received from ECM with CAN communication)
- Parking brake switch signal (received from unified meter and A/C amp. with CAN communication)

- BCM transmits the front fog lamp request signal to IPDM E/R with CAN communication according to the daytime running light ON condition.

Daytime running light ON condition
- While the engine running with the parking brake released

Daytime running light OFF condition
- Engine stopped
- Headlamp ON (Passing included)
- IPDM E/R turns the integrated front fog lamp relay ON and turns the front fog lamp ON according to the front fog lamp request signal.

Component Description