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)