Mazda 6. Manual — part 350
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
T–149
T
DTC B2390
A6E816467000W05
DTC B2390
Communication system between auto leveling control unit (main) and auto leveling control unit
(sub).
DETECTION
CONDITION
Warning
• incorrect servicing of the auto leveling control unit could result in electrical shock because
the unit is integrated with the discharge headlight control unit. Before servicing the auto
leveling control unit, always refer to “Discharge headlight service warnings.” (See
DISCHARGE HEADLIGHT SERVICE WARNINGS
Communication between auto leveling control unit (main) and auto leveling control unit (sub) is not
performed.
POSSIBLE
CAUSE
• Auto leveling control unit (main) malfunction
• Open or shortcircuit in wiring harness between auto leveling control unit (main) and auto leveling
control unit (sub)
T–150
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
Diagnostic procedure
End Of Sie
STEP
INSPECTION
ACTION
1
INSPECT CONNECTOR CONNECTION
• Check fit of auto leveling control units and
headlight connectors on both sides (auto
leveling control unit (main) and (sub)).
• Are installation condition and fit okay?
Yes
Go to next step.
No
After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
2
INSPECT HEADLIGHT (LH) AND
HEADLIGHT (RH)
• Disconnect auto leveling control unit (main)
connector (20-pin) and headlight (LH)
connector (12-pin) and auto leveling control
unit (sub) connector (20-pin) and headlight
(RH) connector (12-pin).
• Is there continuity between the following
connectors?
— Auto leveling control unit (main) connector
(terminal I) and headlight (LH) connector
(terminal 1F)
— Auto leveling control unit (sub) connector
(terminal P) and headlight (RH) connector
(terminal 1F)
Yes
Go to next step.
No
Possible cause is an open circuit in headlight. Replace
headlight (LH) or headlight (RH). (See
COMBINATION LIGHT REMOVAL/INSTALLATION
3
INSPECT WIRING HARNESS BETWEEN
HEADLIGHT (LH) CONNECTOR AND
HEADLIGHT (RH) CONNECTOR
• Disconnect headlight (LH) connector (12-pin)
and headlight (RH) connector (12-pin).
• Is there continuity between the following
connectors?
— Headlight (LH) connector (terminal 1F)
and headlight (RH) connector (terminal
1F)
Yes
Repair auto leveling control unit (main).
(See
T–30 DISCHARGE HEADLIGHT CONTROL UNIT
No
Repair or replace wiring harness between headlight (LH)
and headlight (RH).
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
T–151
T
DTC B2607
A6E816467000W06
Remark: In this case other DTCs can be reported for wrong side.
DTC B2607
Auto leveling control unit controlling system.
DETECTION
CONDITION
Warning
• incorrect servicing of the auto leveling control unit could result in electrical shock because
the unit is integrated with the discharge headlight control unit. Before servicing the auto
leveling control unit, always refer to “Discharge headlight service warnings.” (See
DISCHARGE HEADLIGHT SERVICE WARNINGS
Operation of auto leveling control unit (main) and auto leveling control unit (sub) are reversed.
POSSIBLE
CAUSE
• Mounting of auto leveling control unit (main) and auto leveling control unit (sub) changed
• Poor fit of auto leveling control unit
• Headlight malfunction
• Open or short circuit in wiring harness between auto leveling sensors and headlight (LH)
T–152
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
Diagnostic procedure for headlight (LH)
Diagnostic procedure for headlight (RH)
End Of Sie
STEP
INSPECTION
ACTION
1
INSPECT CONNECTION
• Check fit of auto leveling control unit and fit
of connectors.
• Is fit okay?.
Yes
Go to next step.
No
After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
2
INSPECT WIRING HARNESS BETWEEN
AUTO LEVELING SENSOR
CONNECTORS AND HEADLIGHT
(LH) CONNECTOR
• Disconnect front and rear auto leveling
sensor connector (6-pin) and headlight (LH)
connector (4-pin).
• Is there no continuity between the following
connectors?
— Headlight (LH) connector (terminal 2C)
and front auto leveling sensor connector
(terminal A)
— Headlight (LH) connector (terminal 2D)
and front auto leveling sensor connector
(terminal D)
Yes
Go to next step.
No
Repair or replace wiring harness between front auto leveling
sensor and headlight (LH).
3
INSPECT HEADLIGHT (LH)
• Disconnect auto leveling control unit (main)
connector (20-pin) and headlight (LH)
connector (4-pin).
• Is there no continuity between the following
connectors?
— Headlight (LH) connector (terminal 2B)
and auto leveling control unit (main)
connector (terminal H)
— Headlight (LH) connector (terminal 2A)
and auto leveling control unit (main)
connector (terminal F)
Yes
Clear DTC and check DTC again.
• If DTC is displayed again, replace auto leveling control
unit.
(See
T–30 DISCHARGE HEADLIGHT CONTROL UNIT
No
STEP
INSPECTION
ACTION
1
INSPECT CONNECTION
• Check fit of auto leveling control unit.
• Is fit okay?.
Yes
Go to next step.
No
After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
2
INSPECT HEADLIGHT (RH)
• Disconnect auto leveling control unit (sub)
connector (20-pin).
• Is there no continuity between the following
connectors?
— Terminals F and K
Yes
Clear DTC and check DTC again.
• If DTC is displayed again, replace auto leveling control
unit.
(See
T–30 DISCHARGE HEADLIGHT CONTROL UNIT
No
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