Mazda 2007 CX-9, Service Highlights

Page: 477 / 614

LIGHTING SYSTEMS
09-18–11
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. 2000 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)
2K 2G
B+ B+
TNS
RELAY H/L LOW
RELAY
B+
H/L HI
RELAY
HEAD LIGHT
(LOW-BEAM)
HEAD LIGHT
(HIGH-BEAM)
ILLUMI TAIL
HIGH-BEAM
INDICATOR
LIGHT
TNS
AUTO LIGHT/WIPER
CONTROL MODULE
TRANSISTOR A TRANSISTOR B
2D
2O 2E 2H 2A 2C
B+
ROOM
INSTRUMENT
CLUSTER
AUTO
LIGHT
SENSOR
2F
DLC-2
BCM
METER
2L 2N 2M
LIGHT SWITCH
HI
PASS
HEAD AUTO
OFF
TNS
LO
IG1
ac9uun00000584
3423-1U-06H(09-18).fm 11 ページ ２００６年１１月２１日 火曜日 午後５時４４分