Turn Lamps
When the ignition switch is in the ON or the START position, voltage
is applied through the TURN LPS fuse to the normally closed contacts of the
hazard switch. A single flasher internal to the hazard switch performs
the following functions:
• | Operates the turn signal |
• | Operates the hazard flasher |
When the turn switch is in the LEFT position, voltage is applied to
the following components:
• | The left turn indicator |
• | The left front park/turn lamp |
• | The left rear turn lamp |
The lamps immediately turn ON and flash as the flasher opens and closes
the circuit. If a bulb is in need of replacement, the turn lamps will flash
at twice the normal rate.
The voltage applied to the left front park/turn lamp is also applied
to the left front marker lamp. When the turn/headlamp switch assembly is OFF,
the left and right front marker lamps find a path to a ground through the
left and right front park/turn lamps. The front park/turn lamps provide
low resistance paths to ground. The left front marker lamp flashes with
the turn lamps. The lamps used for the ground path will not flash because
the voltage drop across the marker lamp is much higher than the voltage
drop across the other lamps.
When the headlamp switch is in the PARK or the HEAD position, voltage
is applied to the following components:
When the turn switch is in the LEFT position, the following conditions
exist:
• | The left marker lamp has voltage at both connections. |
• | The left marker lamp does not light. |
When the flasher stops the voltage to the turn lamp, the following conditions
exist:
• | The marker lamp is grounded through the turn lamp. |
• | The marker lamp lights. |
The left front marker lamp flashes ON when the turn filament of the
left front park/turn lamp turns OFF. The left front marker lamp flashes OFF
when the turn filament of the left front park/turn lamp turns ON.
When the turn switch is in the RIGHT position, voltage is applied to
the following components:
• | The right turn indicator |
• | The right front park/turn lamp |
• | The right rear turn lamp |
The lamps immediately turn ON and flash as the flasher opens and closes
the circuit. If a bulb is in need of replacement, the turn lamps will flash
at twice the normal rate.
The voltage applied to the right front park/turn lamp is also applied
to the right front marker lamp. When the turn/headlamp switch assembly is
OFF, the left and right front marker lamps find a path to a ground through
the left and right front park/turn lamps. The front park/turn lamps provide
low resistance paths to ground. The right front marker lamp flashes with
the turn lamps. The lamps used for the ground path will not flash because
the voltage drop across the marker lamp is much higher than the voltage
drop across the other lamps.
When the headlamp switch is in the PARK or the HEAD position, voltage
is applied to the following components:
When the turn switch is in the RIGHT position, the following conditions
exist:
• | The right marker lamp has voltage at both connections. |
• | The right marker lamp does not light. |
When the flasher stops the voltage to the turn lamp, the following conditions
exist:
• | The marker lamp is grounded through the turn lamp. |
• | The marker lamp lights. |
The right front marker lamp flashes ON when the turn filament of the
right front park/turn lamp turns OFF. The right front marker lamp flashes
OFF when the turn filament of the right front park/turn lamp turns ON.
Hazard Lamps
Voltage is applied at all times to the normally open contacts of the
hazard switch. When the hazard switch is in the ON position, voltage is applied
to the following components:
The following components flash on and off:
The front marker lamps flash when the hazard lamps are ON. Refer to
the Turn Lamps Circuit Description above. When the headlamp switch is in the
OFF position, the front marker lamps flash on when the hazard lamps are
ON. When the headlamp switch is in the PARK or the HEAD position, the
front marker lamps flash when the hazard lamps are OFF.
When the hazard lamps are turned ON, the hazard switch flashes on when
the hazard lamps are ON.
Park/Marker/License/Tail Lamps
Voltage is applied to the turn/headlamp switch at all times. When the
turn/headlamp switch is in the PARK or the HEAD position, voltage is applied
to the following components:
The front marker lamps are grounded through the turn filament of the
respective front park/turn lamp. The front marker lamps light as a result.
The automatic lamp control function turns on the park lamps and the
headlamps. This action occurs when the ambient light sensor determines
that the exterior lamps should be turned ON based on the amount of available
light. When the BCM grounds the park lamp relay, voltage is supplied directly
to the park lamps, bypassing the turn/headlamp switch assembly. When this
action occurs, the following conditions exist:
• | The automatic lamp control relay is grounded. |
The lamps turn OFF when the BCM does not ground the park lamp relay
or the automatic lamp control relay. This action is caused by the following
conditions:
• | The available light reaches a predetermined level. |
• | The ignition switch is turned to the OFF position. |
Stop Lamps
Voltage is applied by the brake switch at all times. When the brake
pedal is depressed, the brake switch closes. This condition applies voltage
to the following components:
• | The high-mounted stop lamp assembly |