Mazda 6. Manual — part 348
T–146–2
ON-BOARD DIAGNOSTIC [DISCHARGE HEADLIGHT]
RHID
End Of Sie
DTC B2386
A6E818867000W05
Diagnostic procedure
End Of Sie
DTC B2387
A6E818867000W06
Diagnostic procedure
PID Name
(Definition)
Unit/
Condition
Condition/Specification
Discharge headlight
control unit (RH)
terminal
CCNT
(Number of continuous codes)
—
• DTC is detected: 1—255
• DTC is not detected: 0
—
ONDEMDTC
(Number of on-demand codes)
—
• DTC is detected: 1—255
• DTC is not detected: 0
—
L_VOLT_R
(Discharge headlight control unit (RH) input
voltage)
VOLTAGE
Headlight switch at ON:
B+
D
GDL_P_R
(Output power to discharge headlight bulb (RH))
WATT
Headlight switch at ON:
35—65 W
—
GDL_V_R
(Output voltage to discharge headlight bulb
(RH))
VOLTAGE
Headlight switch at ON:
68—112 V
—
DTC B2386
Discharge headlight illumination malfunction
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Discharge headlight does not illuminate though preparation has been completed.
POSSIBLE
CAUSE
• Discharge headlight bulb malfunction
• Ignitor in front combination light is malfunctioning.
STEP
INSPECTION
ACTION
1
• Are DTCs B2388 and/or B2389 indicated?
Yes
Replace discharge headlight bulb.
(See
)
No
Ignitor in front combination light may be malfunctioning.
Replace front combination light.
(See
T–26 FRONT COMBINATION LIGHT REMOVAL/
)
DTC B2387
Ignitor circuit malfunction
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Ignitor in front combination light is malfunctioning or poorly connected.
POSSIBLE
CAUSE
• Ignitor in front combination light is malfunctioning.
• Ignitor in front combination light is poorly connected.
STEP
INSPECTION
ACTION
1
INSPECT CONNECTOR CONNECTION
• Check fit of discharge headlight control unit and
headlight connectors on both sides (discharge
headlight control unit (LH) and (RH)).
• Are installation condition and fit okay?
Yes
Ignitor in front combination light may be malfunctioning.
Replace front combination light.
(See
T–26 FRONT COMBINATION LIGHT REMOVAL/
)
No
After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, replace front combination
light.
(See
)
ON-BOARD DIAGNOSTIC [DISCHARGE HEADLIGHT]
T–146–3
T
End Of Sie
DTC B2388
A6E818867000W07
Diagnostic procedure
End Of Sie
DTC B2389
A6E818867000W08
Diagnostic procedure
DTC B2388
Discharge headlight operating voltage out of range.
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Discharge headlight operating voltage is outside specification (68V—112V) when inspected 3 minutes
after illumination.
POSSIBLE
CAUSE
• Discharge headlight bulb malfunction
• Discharge headlight bulb life
STEP
INSPECTION
ACTION
1
INSPECT DISCHARGE HEADLIGHT BULB
• Does discharge headlight illuminate normally?
Yes
After correcting fit, clear DTC and check DTC again after
more then 3 minutes low beam on.
• If DTC is displayed again, replace discharge
No
Replace discharge headlight bulb.
(See
DTC B2389
Discharge headlight illumination malfunction
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Automatic reillumination (discharge headlight reilluminates automatically when illumination is
interrupted during normal illumination) occurs twice within 1 minute.
POSSIBLE
CAUSE
• Discharge headlight bulb malfunction
• Discharge headlight bulb life
STEP
INSPECTION
ACTION
1
INSPECT DISCHARGE HEADLIGHT BULB
• Does discharge headlight illuminate normally?
Yes
After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, replace discharge
No
T–146–4
ON-BOARD DIAGNOSTIC [DISCHARGE HEADLIGHT]
End Of Sie
DTC B2391
A6E818867000W09
Diagnostic procedure
DTC B2391
Discharge headlight input resistance too high
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Discharge headlight does not illuminate because of voltage drops caused by high impedance on input
path for supply voltage.
POSSIBLE
CAUSE
• Resistance in related wiring harness too high
• Resistance in front combination light internal harness too high.
STEP
INSPECTION
ACTION
1
INSPECT CONNECTOR CONNECTION
• Check fit of discharge headlight control unit and
headlight connectors.
• 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 WIRING HARNESS
• Disconnect headlight connector (12-pin).
• Measure resistance of headlight connector
terminal 1C to battery negative terminal.
• Measure resistance of headlight connector
terminal 1B to battery positive terminal.
• Is sum of resistances more than 1.5 ohms?
Yes
Repair related wiring harness.
No
Front combination light internal harness may have too
high impedance. Replace front combination light.
(See
T–26 FRONT COMBINATION LIGHT REMOVAL/
)
HEADLIGHT (LH)
HARNESS SIDE CONNECTOR
1K
1I
1G 1E
1H 1F
1L
1J
1C 1A
1D 1B
HEADLIGHT (RH)
HARNESS SIDE CONNECTOR
1K
1I
1G 1E
1H 1F
1L
1J
1C 1A
1D 1B
ON-BOARD DIAGNOSTIC [DISCHARGE HEADLIGHT]
T–146–5
T
End Of Sie
DTC B2392
A6E818867000W10
Diagnostic procedure
End Of Sie
DTC B2393
A6E818867000W11
Diagnostic procedure
End Of Sie
DTC B2392
Discharge headlight Input voltage high
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Voltage detected at discharge headlight control unit terminals D is more than 19 V.
POSSIBLE
CAUSE
• Short to power circuit between generator and PCM
• Generator malfunction
• Battery malfunction
• Discharge headlight control unit malfunction
STEP
INSPECTION
ACTION
1
INSPECT BATTERY VOLTAGE
• Measure battery voltage.
• Is voltage less than 19 V?
Yes
Go to next step.
No
Inspect charging system.
2
INSPECT DISCHARGE HEADLIGHT CONTROL
UNIT
• Clear DTC.
• Read DTCs using SST (WDS or equivalent).
• Is DTC B2392 displayed again?
Yes
Replace discharge headlight control unit.
(See
T–30 DISCHARGE HEADLIGHT CONTROL UNIT
No
Troubleshooting completed.
DTC B2393
Discharge headlight control unit output circuit malfunction
DETECTION
CONDITION
Warning
• Incorrect servicing of the discharge headlight control unit could result in electrical shock.
Before servicing the discharge headlight control unit, always refer to “Discharge headlight
service warnings”. (See
T–25 DISCHARGE HEADLIGHT SERVICE WARNINGS
• Abnormal output from discharge headlight control unit to ignitor.
POSSIBLE
CAUSE
• Open circuit, short to ground or short to power circuit in front combination light internal harness
STEP
INSPECTION
ACTION
1
INSPECT CONNECTOR CONNECTION
• Check fit of discharge headlight control unit and
headlight connectors on both sides (discharge
headlight control unit (LH) and (RH)).
• 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 DISCHARGE HEADLIGHT CONTROL
UNIT
• Replace discharge headlight control unit.
(See
CONTROL UNIT REMOVAL/INSTALLATION
)
• Does discharge headlight illuminate normally?
Yes
Troubleshooting completed.
No
Ignitor in front combination light may be malfunctioning.
Replace front combination light.
(See
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