Honda Accord 2008 Manual page 2220

07/11/02 09:35:45 61TA0000_220_0190
System Description
Headlights System Description
The headlight system is composed of the driver's MICU, the passenger's MICU, the headlight and dimmer/flash-to-
pass switches (inside the combination light switch), the left and right headlights, and the high beam indicator.
Each MICU controls each side of the headlights with a built-in low beam control circuit and a built-in high beam control
circuit based upon the position of the headlight and dimmer/flash-to-pass combination light switches. The taillights
and license plate lights are controlled by the driver's MICU only.
Low Beams
When you move the headlight switch to the ON position and the dimmer/flash-to-pass switch to the low position, a
ground signal is supplied to the No. 8 terminal of the driver's under-dash fuse/relay box connector R (24P). The driver's
MICU then energizes the low beam control circuit, supplying battery voltage to the low beam of the left headlight,
turning it on. Also the driver's MICU sends the message to the passenger's MICU by B-CAN communication lines. The
passenger's MICU then energizes the low beam control circuit, supplying battery voltage to the low beam of the right
headlight, turning it on.
High Beams
When you move the headlight switch to the ON position and the dimmer/flash-to-pass switch to the high position,
ground signals are supplied to the No. 8 and No. 22 terminals of the driver's under-dash fuse/relay box (driver's MICU)
connector R (24P). The driver's and passenger's MICUs then energize the each side of the high beam headlight control
circuits, supplying battery voltage to the high beam headlights, turning them on.
Flash-to-Pass
When you pull the dimmer/flash-to-pass switch to the passing position, a ground signal is supplied to No. 21 terminal
of the driver's under-dash fuse/relay box (MICU) connector R (24P). The driver's and passenger's MICUs then energize
the high beam control circuits for as long as the switch is held, supplying battery voltage to the high beam headlights,
turning them on.
Daytime Running Lights System Description
The daytime running lights system includes the MICUs, the left and right high beam headlights, and the DRL indicator.
The daytime running lights operate with the ignition switch ON (II), the headlights off (headlight switch OFF or in the
parking position), and the parking brake released.
When the daytime running lights are on, the MICU turns the high beam headlight control circuit on and off (duty cycle),
which provides a reduced voltage (approximately 6 8 volts) to the high beam headlights (via the No. 1 and No. 28
fuses in the driver's under-dash fuse/relay box and No. 1 fuse in the passenger's under-dash fuse/relay box); the high
beam headlights come on with reduced brightness. The MICU also supplies battery voltage to the DRL indicator,
turning it on.
NOTE:
• The daytime running lights are disabled when the ignition switch is turned to LOCK (0). To keep the daytime running
lights from coming on, apply the parking brake switch while the ignition switch is in LOCK (0) position. When you
then turn the ignition switch back to ON (II), the daytime running lights will not come on until the parking brake is
released.
• The headlights revert to normal operation when you turn them on with the headlight switch.
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