Daytime Running Lamp: Description and Operation

DAYTIME RUNNING LAMPS (DRL) - DOMESTIC/CANADIAN
The daytime running lamps (DRL) will illuminate the right and left front turn signal bulbs continuously. The DRLs will operate when the following conditions are met:
1. The ignition is in the RUN or CRANK position
2. The shift lever is out of the PARK position for vehicles equipped with automatic transmissions or the parking brake is released for vehicles with manual transmissions.
3. The high and low beam headlamps are OFF.

When conditions for DRL operation exist, the powertrain control module (PCM) sends a class 2 message to the dash integration module (DIM), on vehicles equipped with automatic transmissions indicating the transmission is out of the PARK position. The instrument panel cluster IPC sends a class 2 message to the DIM on vehicles that are equipped with manual transmissions that the parking brake is released. The DIM sends a signal to the turn signal/hazard flasher module by grounding the DRL signal circuit of the turn signal/hazard flasher module. When the turn signal/hazard flasher module receives this signal the module supplies continuous battery voltage to the right and left front turn signal lamps. The turn signal lamps are permanently ground at G104 and therefore illuminate. Turn signal and hazard flasher operation take precedence over DRL operation. For Domestic vehicle only, DRL operation will be disabled if the Photocell Status indicates Dark conditions, the twilight switch status OFF and either the front fog lamps or park lamps are turned ON.

DAYTIME RUNNING LAMPS (DRL) - NORWAY/SWEDEN
The DRLs will illuminate the low beam headlamps and the park lamps at normal intensity. The DRLs will operate when the following conditions are met:
- The ignition is in the RUN or CRANK position.
- The shift lever is out of the PARK position for vehicles equipped with automatic transmissions or the parking brake is released for vehicles with manual transmissions.
- The high and low beam headlamps are OFF.
- The park lamps are OFF.
- The fog lamps are OFF.

When conditions for DRL operation exist, the PCM sends a class 2 message to the DIM, on vehicles equipped with automatic transmissions indicating the transmission is out of the PARK position. The instrument panel cluster (IPC) sends a class 2 message to the DIM, on vehicles that are equipped with manual transmissions that the parking brake is released. The DIM will then ground the control circuit of the DRL relay and the park lamp relay. Battery voltage is supplied to the coil and switch side feed circuits of the DRL relay. When the DIM grounds the control circuit of the DRL relay the switch contacts close and battery voltage is supplied to the low beam headlamps. Operation of the park lamps and are the same as described in the park lamp section.