Mazda 2007 CX-9, Service Highlights

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LIGHTING SYSTEMS
09-18–12
Lights off operation
1. When the light switch is in the AUTO position the illumination level 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 and forward illumination level sensor detect approx. 4000 lux or more for 1.0 s in front of and
above the vehicle, the headlight and TNS off 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 turns off the current to
transistor A, causing the TNS relay to also turn off.
4. When the TNS relay turns off, the TNS also turns off.
5. The microcomputer in the auto light/wiper control module receives the control signal and turns off the current to
transistor B, causing the headlight relay (LO) to also turn off.
6. When the headlight relay (LO) turns off, the headlights (low-beam) also turn off.
Fail-Safe Function
•
When a auto light sensor malfunction or a communication error between the auto light sensor and auto light/
wiper control module is detected, the auto light/wiper control module initiates controls as indicated in the fail
safe function table.
Fail-Safe Function Table
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
2D
2O 2E 2H 2A 2C
B+
ROOM
INSTRUMENT
CLUSTER
AUTO
LIGHT
SENSOR
DLC-2
BCM
METER
2L 2N 2M
LIGHT SWITCH
HI
PASS
HEAD AUTO
OFF
TNS
LO
IG1
2F
TRANSISTOR A TRANSISTOR B
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Malfunctions
Fail-safe function
Recovery items
Before operation After operation
•
auto light sensor error
•
auto light sensor
communication error
Headlight illuminated
Maintains headlights
on
•
Ignition switch lock position
•
When a auto light sensor malfunction
is cleared
•
When communication is restored
•
When the light switch is in a position
other than AUTO
TNS illuminated Maintains TNS on
Off Maintains turn-off
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