Mazda 2009 RX-8, Service Highlights

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LIGHTING SYSTEMS
09-18–9
09-18
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.
(1)
(2)
TRANSISTOR A TRANSISTOR B
1L 2L 2N 2M
2K 2G
B+ B+
TNS
RELAY
HEADLIGHT
RELAY
HEAD LIGHT
(LOW-BEAM)
AUTO LIGHT/WIPER
CONTROL MODULE
HIGH-BEAM
INDICATOR
LIGHT
ILLUMI TAIL
LIGHT SWITCH
HI
PASS
HEAD
AUTO
OFF
TNS
LO
2O
2E 2H 2A 2C
AUTO
LIGHT
SENSOR
1G
1K 1B 1A 1I
2P
HEAD
LIGHT RH
(HIGH
BEAM)
HEAD LIGHT LH
(HIGH BEAM)
PARKING
BRAKE
SWITCH
B+
DSC HU/CM
OR
ABS HU/CM
2F
DLC-2
2D
B+
ROOM
METER
IG1
TNS
2I 2J
FRONT FOG
LIGHT
RELAY
FRONT
FOG
LIGHT
FRONT
FOG
LIGHT
SWITCH
B+
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