Daytime Running Lamp: Description and Operation
How the Circuit Works ('02-'04 Models USA)WARNING: A transient high tension (25,000 V) occurs at the bulb sockets of the high intensity discharge (HID) lamps when the combination light switch is turned ON. It may cause serious electrical shock or electrocution if you do not observe the cautions below.
CAUTION
- Never turn on the combination light switch before fitting the HID bulbs to their bulb sockets and completing the reassembly of the headlight assembly.
- Do not service the headlight assembly in wet conditions, such as rain or snow, near a sprinkler system, or when your hands are wet to prevent electrocution.
- Do not touch the surface of the HID bulbs with your bare hands and do not stain it with any oils.
- Do not disassemble the inverter unit and the igniter unit.
- Do not turn on the HID bulb by using a power source other than the battery mounted on the vehicle.
Low Beams
The headlight low beam and high beam relays receive battery voltage at all times. When you turn the headlight switch to the HEAD position with the dimmer switch in LOW, ground is applied through the RED/BLU wires to the low beam relay coil (through the headlight diode) and the high beam relay coil. The relays are then energized, applying battery voltage to the left and right low and high beam headlights through fuses 52, 49 and 39, 38 respectively. The low beam bulbs come on because they are individually grounded by G302 and G202. The high beams and high beam indicator remain off because their ground path is interrupted by the deenergized dimmer relay.
High Beams
When you pull the dimmer switch to HIGH with the low beams already on, ground is applied to the dimmer relay from the dimmer switch. This energizes the dimmer relay, applying ground to the high beam bulbs and high beam indicator, which turns on the high beams and indicator light.
Flash-to-Pass
When you hold the flash-to-pass switch in the FLASH position, ground is applied through the RED/BLU wires to the low beam relay coil (through the headlight diode), the high beam relay coil and the dimmer relay coil. This energizes the headlight low beam, high beam, and dimmer relays, applying battery voltage to the low and high beam bulbs. As the high beam bulbs receive battery voltage, the dimmer relay is energized, applying ground to the high beam bulbs and high beam indicator, which turns on the high beams and indicator light.
How the Circuit Works ('02-'04 Models Canada)
WARNING: A transient high tension (25,000 V) occurs at the bulb sockets of the high intensity discharge (HID) lamps when the combination light switch is turned ON. It may cause serious electrical shock or electrocution if you do not observe the cautions below.
CAUTION
- Never turn on the combination light switch before fitting the HID bulbs to their bulb sockets and completing the reassembly of the headlight assembly.
- Do not service the headlight assembly in wet conditions, such as rain or snow, near a sprinkler system, or when your hands are wet to prevent electrocution.
- Do not touch the surface of the HID bulbs with your bare hands and do not stain it with any oils.
- Do not disassemble the inverter unit and the igniter unit.
- Do not turn on the HID bulb by using a power source other than the battery mounted on the vehicle.
Daytime Running Lights
When you turn the ignition switch to ON (II) with the parking brake released and the headlight switch in either OFF or PARK, the daytime running lights control unit supplies about 6 volts to the ORN wire (cavity 1), about 12 volts to the GRN wire (cavity 11), and ground to the RED/BLU wire (cavity 10) This provides about 6 volts to both high beam headlights, causing them to come on at reduced brightness If you apply the parking brake, ground is applied to the daytime running lights control unit at the GRN/YEL (cavity 6) wire If the parking brake is applied before you turn the ignition switch to ON (II), the daytime mode will remain off until you release the parking brake Once the high beams are in the daytime mode, applying the parking brake will not turn them off When you switch to low beam, high beam, or flash-to-pass operation, ground is applied to the daytime running lights control unit through the RED/BLU (cavity 8) wire, and the control unit then turns off the daytime running lights mode
Low Beams
The headlight low beam and high beam relays receive battery voltage at all times When you turn the headlight switch to the HEAD position with the dimmer switch in LOW ground is applied through the RED/BLU wires to the low beam relay coil (through the headlight diode) and the high beam relay coil This energizes the relays, applying battery voltage to the left and right low beam headlights through fuses 52 and 49 The left and right low beam headlights are grounded by G302 and G202 respectively
High Beams
When you pull the dimmer switch to HIGH with the low beams already on, ground is applied to the dimmer relay from the dimmer switch This energizes the dimmer relay, removing the ground signal to the PNK wire (cavity 7) of the daytime running lights control unit The control unit applies voltage to the high beam bulbs and high beam indicator The high beam bulbs and indicator ground through the energized dimmer relay, which turns on the high beams and indicator light
Flash-to-Pass
When you hold the flash-to-pass switch in the FLASH position, ground is applied through the RED/BLU wires to the low beam relay coil (through the headlight diode), the high beam relay coil and the dimmer relay coil This energizes the headlight low beam and high beam relays, applying battery voltage to the low beam bulbs and the daytime running lights control unit and to the dimmer relay The dimmer relay is energized, applying ground through the RED/BLU wire to the daytime running lights control unit The control unit applies voltage to the high beam bulbs and high beam indicator, which turns on the high beams and indicator light