Mazda 6. Manual — part 352
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
T–157
T
DTC B2619
A6E816467000W09
Diagnostic procedure
DTC B2619
Rear auto leveling sensor signal 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
Output signal is not sent from the rear auto leveling sensor.
POSSIBLE
CAUSE
• Rear auto leveling sensor malfunction
• Open or short circuit in wiring harness between rear auto leveling sensor and headlight (LH)
• Headlight (LH) malfunction
STEP
INSPECTION
ACTION
1
INSPECT REAR LEVELING SENSOR
CONNECTION
• Check installation condition of rear auto
leveling sensor and fit of connector.
• 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 BETWEEN
REAR AUTO LEVELING SENSOR
CONNECTOR AND HEADLIGHT (LH)
CONNECTOR
• Disconnect rear auto leveling sensor
connector (6-pin) and headlight (LH)
connector (4-pin).
• Is there continuity between the following
connectors?
— Rear auto leveling sensor connector
(terminal B) and headlight (LH) connector
(terminal 2D)
Yes
Go to next step.
No
Repair or replace wiring harness between rear auto leveling
sensor and headlight (LH).
T–158
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
End Of Sie
DTC B2626, B2477
A6E816467000W10
Diagnostic procedure
End Of Sie
3
INSPECT WIRING HARNESS BETWEEN
REAR AUTO LEVELING SENSOR
CONNECTOR AND HEADLIGHT (LH)
CONNECTOR
• Disconnect rear auto leveling sensor
connector (6-pin) and headlight (LH)
connector (4-pin).
• Is there no continuity between the following
connectors?
— Rear auto leveling sensor connector
(terminal B) and headlight (LH) connector
(terminal 2B)
— Rear auto leveling sensor connector
(terminal B) and headlight (LH) connector
(terminal 2A)
Yes
Go to next step.
No
Repair or replace wiring harness between rear auto leveling
sensor and headlight (LH).
4
INSPECT HEADLIGHT (LH)
• Disconnect auto leveling control unit (main)
connector (20-pin) and headlight (LH)
connector (4-pin).
• Is there continuity between the following
connectors?
— Auto leveling control unit (main) connector
(terminal F) and headlight (LH) connector
(terminal 2D)
Yes
Go to next step.
No
Possible cause is an open circuit in headlight (LH). Replace
headlight (LH). (See
5
INSPECT HEADLIGHT (LH)
• Disconnect auto leveling control unit (main)
connector (20-pin) and headlight (LH)
connector (4-pin).
• Is there continuity between the following
connectors?
— Auto leveling control unit (main) connector
(terminal G) and headlight (LH) connector
(terminal 2D)
— Auto leveling control unit (main) connector
(terminal K) and headlight (LH) connector
(terminal 2D)
— Auto leveling control unit (main) connector
(terminal E) and headlight (LH) connector
(terminal 2D)
Yes
Replace rear auto leveling sensor.
(See
T–32 REAR AUTO LEVELING SENSOR REMOVAL/
No
Possible cause is an open circuit in headlight (LH). Replace
headlight (LH). (See
STEP
INSPECTION
ACTION
DTC B2626,
B2477
Headlight zeroset system for auto leveling control unit.
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
Headlight zeroset for auto leveling control unit is not set.
POSSIBLE
CAUSE
• Headlight zeroset for auto leveling control unit is not set or the setting is invalid
ACTION
Check connections of each sensor and the unit. Then connect WDS or equivalent and perform headlight zeroset.
(See
)
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
T–159
T
DTC B2735
A6E816467000W11
Diagnostic procedure
End Of Sie
DTC B2735
Headlight leveling actuator signal 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
Output signal to headlight leveling actuator is abnormal.
POSSIBLE
CAUSE
• Headlight leveling actuator malfunction
• Auto leveling control unit malfunction
• Headlight malfunction
STEP
INSPECTION
ACTION
1
INSPECT CONNECTOR CONNECTION
• Check fit of auto leveling control unit.
• Is condition of the fit okay?
Yes
Possible cause is headlight wiring harness malfunction or
malfunctioning headlight leveling acutuator.
Replace headlight and go to next step. (See
COMBINATION LIGHT REMOVAL/INSTALLATION
No
After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
2
• Does headlight leveling actuator work
properly?
Yes
Troubleshooting completed.
No
Replace auto leveling control unit.
(See
T–160
ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
FOREWORD
A6E817067000W01
Reading DTCs procedure
• If there is a failure to display a DTC using the security light or SST (WDS or equivalent), check the symptom
and inspect malfunctioning parts.
Caution
• When the engine does not start or stalls and the following DTCs are not indicated, go to engine
symptom troubleshooting.
Note
• When the immobilizer system is defective, the engine cannot be started.
• If engine condition is normal but light stays on, inspect for short circuit between security light. Repair or
replace the wiring harness if necessary.
• The vehicle may fail to start or a DTC may be stored in the PCM if the following occurs:
— If a large, metal object is close to a valid key
— If an electrical device is close to a valid key
— If two or more valid keys are on the same key ring
• If any malfunction cannot be identified, verify that no metal object or electrical device is on the key ring.
• The security light displays a DTC 10 times.
1. Turn the ignition switch to ON position.
• If there is any malfunction, the security light flashes rapidly for approx. 1 minute and start displaying a
DTC.
• If there is no malfunction, the security light illuminates for approx. 3 seconds and goes off.
2. Verify the security light condition and read the DTC by security light flashing pattern
3. Verify the DTC with WDS or equivalent.
4. If the DTC is indicated, go to troubleshooting referring to the DTC table.
PID/Data Monitor and Record Procedure
1. Connect SST (WDS or equivalent) to the vehicle
DLC-2 16-pin connector.
2. Access and monitor PIDs using SST (WDS or
equivalent).
ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM]
Symptom
Possibly malfunctioning part
Security light is stuck on or does not illuminate.
• Instrument cluster (security light)
• PCM
• Related harness
Engine does not start.
(When ignition switch is turned to ON, security light illuminates
for approx. 3 seconds and goes off.)
• PCM
• Stater relay
• Key (transponder)
• Key ID number
• Related harness
DLC-2
A6E3970W002
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