Mazda 6. Manual — part 59
EXTERIOR LIGHTING SYSTEM
T–17
T
T
Failure Detection Function
Abnormal input detection function
•
If the discharge headlight control unit input voltage (9—16 V) fails to maintain operational voltage (except for
the drop in voltage immediately after the headlights are turned on), the discharge headlight control unit turns off
the headlights for protection or to prevent part operation errors.
•
The discharge headlight control unit turns the headlights back on at resumption of normal operational voltage.
Abnormal output detection function
•
If there is an abnormality in the output system (detects an open or GND short circuit in harness), the discharge
headlight control unit turns off the headlights for protection or to prevent part operation errors.
•
If the discharge headlight control unit turns off the headlights due to an abnormality in the output system, the
discharge headlight control unit will maintain them in the off condition until the light switch is turned again from
off to on.
End Of Sie
ON-BOARD DIAGNOSTIC FUNCTION
A6E811201052T12
Outline
•
The on-board diagnostic function is incorporated into the discharge headlight control unit (LH) and discharge
headlight control unit (RH). This function can narrow down discharge headlight malfunction locations.
•
The on-board diagnostic function consists of the following functions: a failure detection function, which detects
malfunctions in discharge headlight system-related parts; a memory function, which stores detected DTCs; a
self-malfunction diagnostic function, which indicates system malfunctions using DTCs; and a PID/data
monitoring function, which verifies the input/output condition of specific input/output signals being read out.
•
Using an SST (WDS or equivalent), DTCs can be read out and deleted, and the PID/data monitoring function
can be activated.
Block Diagram
.
Self-Malfunction Diagnostic Function
•
The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC,
to the DLC-2. The DTC can be read out using an SST (WDS or equivalent).
Failure Detection Function
•
The failure detection function in each discharge headlight control unit detects malfunctions in input/output
signals.
•
This function outputs the DTC for the detected malfunction to the DLC-2, and also sends the detected result to
the memory function.
Memory Function
•
The memory function stores the DTC for the malfunction of input/output signals for related parts, as determined
by the failure detection function.
End Of Sie
9
8
7
5
4
3
6
1
2
3
4
10
A6E8112T565
1
Front combination light (LH)
2
Front combination light (RH)
3
Discharge headlight bulb (low-beam)
4
Ignitor
5
Discharge headlight control unit (LH)
6
Discharge headlight control unit (RH)
7
LHID
8
RHID
9
DLC-2
10
SST (WDS or equivalent)
EXTERIOR LIGHTING SYSTEM
T–17–1
T–17BODY ELECTRICAL SYSTEM
DTC table
PID/Data Monitor Function
•
The PID/data monitoring function optionally selects monitored input/output signal items that are set in the
discharge headlight control unit (LH) or the discharge headlight control unit (RH), and performs read out in real
time.
•
An SST (WDS or equivalent) is used to read out the PID/data monitor information.
PID/Data monitor table (LHID)
PID/Data monitor table (RHID)
End Of Sie
EXTERIOR LIGHTING SYSTEM
DTC Description
B2386
Discharge headlight illumination malfunction.
B2387
Ignitor circuit malfunction.
B2388
Discharge headlight operating voltage out of range.
B2389
Discharge headlight illumination malfunction.
B2391
Discharge headlight input resistance too high.
B2392
Discharge headlight input voltage high.
B2393
Discharge headlight control unit output circuit malfunction.
PID name
Definition
Operation/unit
(WDS or equivalent)
CCNT
Number of continuous trouble codes
—
ONDEMDTC
Number of on-demand trouble codes
—
L_VOLT_L
Discharge headlight control (LH) input voltage
VOLTAGE
GDL_P_L
Output power to discharge headlight bulb (LH)
WATT
GDL_V_L
Output voltage to discharge headlight bulb (LH)
VOLTAGE
PID name
Definition
Operation/unit
(WDS or equivalent)
CCNT
Number of continuous trouble codes
—
ONDEMDTC
Number of on-demand trouble codes
—
L_VOLT_R
Discharge headlight control unit (RH) input voltage
VOLTAGE
GDL_P_R
Output power to discharge headlight bulb (RH)
WATT
GDL_V_R
Output voltage to discharge headlight bulb (RH)
VOLTAGE
EXTERIOR LIGHTING SYSTEM
T–17–2
HEADLIGHT AUTO LEVELING SYSTEM
A6E811201052T06
Outline
•
The optical axis of the headlights adjusts automatically at fixed angles to improve visibility and prevent the
blinding of oncoming traffic when the vehicle changes speed or is under varying cargo and passenger weight
conditions, among other variables.
Structural View
System Diagram
End Of Sie
A6E8112T114
1
Auto leveling control unit (main)
2
Auto leveling control unit (sub)
3
Front auto leveling sensor
4
Rear auto leveling sensor
5
Headlight leveling actuator (LH)
6
Headlight leveling actuator (RH)
7
ABS/TCS HU/CM or DSC HU/CM
A6E8112T115
1
Auto leveling control unit (main)
2
Auto leveling control unit (sub)
3
Front auto leveling sensor
4
Rear auto leveling sensor
5
Headlight leveling actuator (LH)
6
Headlight leveling actuator (RH)
7
ABS/TCS HU/CM or DSC HU/CM
T–18
EXTERIOR LIGHTING SYSTEM
TBODY ELECTRICAL SYSTEM
Varying Passenger And Cargo Conditions Operation
1. According to the fluctuation of the suspension, the auto leveling sensors installed in the front and rear of the
vehicle send a signal to auto leveling control unit (main).
2. When a difference between two of the signal inputted from the auto leveling sensors is detected, the auto
leveling control unit (main) verifies the vehicle attitude, then calculates the amount of optical axis adjustment
and sends signal to the auto leveling control unit (sub).
3. The auto leveling control unit compares the actual and the required position of the reflector, then inputs a
command signal to the headlight leveling actuator.
Operation when driving
1. While driving with the headlights on, the auto leveling control unit (main) receives an inputted vehicle speed
signal from the ABS/TCS HU/CM or DSC HU/CM unit (referred to as ABS (DSC) HU/CM in this section) and a
signal based on suspension fluctuation from the front and rear auto leveling sensors.
2. Based on the inputted vehicle speed signal, the auto leveling control unit calculates acceleration angle and
verifies the change in vehicle speed. Also, if there is a difference between two signal inputted from the front and
rear auto leveling sensors, the auto leveling control unit (main) unit verifies the actual attitude of the vehicle.
The auto leveling control unit (main) calculates the optical axis adjustment amount based on the condition of
these two signal, and sends signal to the auto leveling control unit (sub).
3. The auto leveling control unit compares the actual and the required position of the reflector, then inputs
command signal to the leveling actuator.
EXTERIOR LIGHTING SYSTEM
A6E8112T116
A6E8112T117
1
Zero setting
2
Large passenger or cargo weight
3
Auto leveling control unit (main)
4
Auto leveling control unit (sub)
5
Front auto leveling sensor
6
Rear auto leveling sensor
7
Headlight leveling actuator (LH)
8
Headlight leveling actuator (RH)
9
ABS/TCS HU/CM or DSC HU/CM
10
Difference between two voltage signals
11
Vehicle attitude
12
Optical axis adjustment amount
13
Optical axis
14
Zero reference
15
High
16
Low
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