Illumination Operation - Mazda RX-8 2009 Service Highlights

Illumination operation

1. When the light switch is in the AUTO position the illumination sensors in the auto light sensor (installed in the
windshield) detect the illumination level above and in front of the vehicle.
2. If the upward or forward illumination sensors detect approx. 2,000 lux or less in front of and above the vehicle,
the headlight and TNS illumination control signal is sent to the auto light/wiper control module.
3. The microcomputer in the auto light/wiper control module receives the control signal and sends current (1) to
transistor A, causing the transistor A to turn on.
4. When transistor A turns on, the TNS relay also turn on. At the same time, the TNS illuminate.
5. The microcomputer in the auto light/wiper control module receives the control signal and sends current (2) to
transistor B, causing the transistor B to turn on.
6. When transistor B turns on, the headlight relay (LO) also turns on. At the same time, the headlights (low-beam)
illuminate.
B+
TNS
RELAY
TAIL ILLUMI
TNS
2G
(1)
TRANSISTOR A
2M 2N
HEAD
TNS
OFF
LIGHTING SYSTEMS
B+
HEADLIGHT
RELAY
HIGH-BEAM
INDICATOR
LIGHT
HEAD LIGHT
(LOW-BEAM)
2K
(2)
AUTO LIGHT/WIPER
TRANSISTOR B
CONTROL MODULE
2L 1L
PASS
HI
AUTO
LO
LIGHT
AUTO
SENSOR
LIGHT SWITCH
B+
FRONT FOG
LIGHT
RELAY
FRONT
B+
FOG
LIGHT
ROOM
FRONT
FOG
LIGHT
SWITCH
2D
2J
2I
2E 2H 2A 2C
IG1
METER
DSC HU/CM
OR
ABS HU/CM
B+
HEAD LIGHT LH
(HIGH BEAM)
HEAD
LIGHT RH
(HIGH
BEAM)
1I 1A 1B 1K
1G 2P 2F
DLC-2
PARKING
BRAKE
SWITCH
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2O