Mazda 6. Manual - part 349

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM] 

T–147

T

TBODY ELECTRICAL SYSTEM

FOREWORD

A6E816467000W01

Outline

• The OBD (on-board diagnostic) test inspects the integrity and function of the headlight auto leveling system 

and output the results when reqested by the specitic tests.

• OBD test also:

— Provides a quick inspection of the headlight auto leveling system.
— Is usually performed at the start of each deagnostic procedure.
— Provides verification after repairs to ensure that no other faults occurred during service.

• Diagnostic DTC can be read/cleared, using the SST (WDS or equivalent).

• The OBD test is divided into 3 tests:

— Read/clear diagnostic results, PID monitor and record and active command modes.

Read/clear diagnostic results

• This function allows you to read or clear DTCs in the auto leveling control unit (main) memory.

Reading DTCs Procedure Using WDS or equivalent

1. Connect WDS or equivalent to the vehicle DLC-2 

16-pin connector.

2. Turn the ignition switch to ON (Engine OFF) or 

start engine.

3. Retrieve DTC by WDS or equivalent.

Clearing DTCs Procedures Using WDS or equivalent

1. After repairs have been made, perform the reading DTCs procedure.
2. Turn the ignition switch to ON (Engine OFF) or start engine.
3. Erase DTC by WDS or equivalent.
4. Ensure that the customer

′s concern has been resolved.

PID/Data Monitor and Record Procedure

1. Connect WDS or equivalent to the vehicle DLC-2 

16-pin connector.

2. Turn the ignition switch to ON (Engine OFF) or 

start engine.

3. Access and monitor PIDs by WDS or equivalent.

Note

• The data monitor function monitors the 

calculated values of input/output signals in 
the auto leveling control unit (main) and the 
auto leveling control unit (sub), and it does 
not directly display monitored value faults as 
faults in input/output parts themselves. If a 
monitored value is not within the 
specification it will be necessary to inspect input/output parts separately by such means as DTC 
inspection or the active command modes function.

End Of Sie

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]

DLC-2

A6E3970W002

DLC-2

A6E3970W002

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM] 

T–147–1

T–147BODY ELECTRICAL SYSTEM

Active Command Modes Procedure

1. Connect WDS or equivalent to the vehicle DLC-2 

16-pin connector.

2. Turn the ignition switch to ON (Engine OFF) or 

start engine.

3. Turn on the headlight (low-beam).
4. Activate active command modes using WDS or 

equivalent.

End Of Sie

DTC TABLE

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• DTCs are common for present and past malfunction diagnosis.

End Of Sie

PID/DATA MONITOR TABLE

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LHID

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]

DLC-2

A6E3970W002

DTC Description

Page

B1932

Auto leveling control unit system.

(See 

T–148 DTC B1932

)

B2141

Configuration setting system for auto leveling control unit.

(See 

T–148 DTC B2141, B2477

)

B2390

Communication system between auto leveling control unit (main) and 
auto leveling contro unit (sub).

(See 

T–149 DTC B2390

)

B2477

Auto leveling control unit setting system.

—

B2607

Auto leveling control unit controlling system.

(See 

T–151 DTC B2607

)

B2615

Front auto leveling sensor or rear auto leveling sensors power supply 
system.

(See 

T–153 DTC B2615

)

B2616

Front auto leveling sensor signal system.

(See 

T–155 DTC B2616

)

B2619

Rear auto leveling sensor signal system.

(See 

T–157 DTC B2619

)

B2626

Headlight zerosetting system for auto leveling control unit.

(See 

T–158 DTC B2626, B2477

)

B2735

Headlight leveling actuator signal system.

(See 

T–159 DTC B2735

)

PID Name

(Definition)

Unit/

Condition

Condition/Specification

 Auto Leveling 

Control Unit 

(Main) 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

—

LHIDIGNV
(Auto leveling control unit (main) input voltage)

VOLTAGE

Ignition switch at ON:

B+

L

F_CAL
(Signal input from front auto leveling sensor at time 
of headlight zeroset (stored in memory))

VOLTAGE

Ignition switch at ON:

0.5—4.5 V

—

F_LEVEL
(Current input signal sent from front auto leveling 
sensor)

VOLTAGE

Ignition switch at ON:

0.5—4.5 V

G,H,K

R_CAL
(Signal input from rear auto leveling sensor at time 
of headlight zeroset (stored in memory))

VOLTAGE

Ignition switch at ON:

0.5—4.5 V

—

R_LEVEL
(Current input signal sent from rear auto leveling 
sensor)

VOLTAGE

Ignition switch at ON:

0.5—4.5 V

F,G,K

L_REFLECTOR
(Headlight leveling actuator angle control output 
signal sent to auto leveling control unit (sub))

ANGLE

Ignition switch at ON:

-5—4

°

I

STP_MTR_L
(Headlight leveling actuator (LH) current position)

STEP

Ignition switch at ON:

12—520

Q,R,S,T

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM] 

T–147–2

*

: Unnecessary for diagnosis

RHID

*

: Unnecessary for diagnosis

End Of Sie

LHID_VSS
(Vehicle speed input signal from ABS/TCS HU/CM)

KPH

• Vehicle is stopped: 0 KPH {0 MPH}

• Vehicle is driving: Indicates vehicle 

speed

P

PART#SUF*
(Part number identification should be displayed)

—

—

—

SERIAL#1*
(Auto leveling control unit serial number part 1 
should be displayed)

—

—

—

SERIAL#2*
(Auto leveling control unit serial number part 2 
should be displayed)

—

—

—

SOFTVER*
(Software version number should be displayed)

—

—

—

L_VOLT_L
(Discharge headlight control (LH) input voltage)

VOLTAGE

Headlight switch at ON: 

B+

D

GDL_P_L
(Output power to discharge headlight bulb (LH))

WATT

Headlight switch at ON: 

35—65 W

—

GDL_V_L
(Output voltage to discharge headlight bulb (LH))

VOLTAGE

Headlight switch at ON: 

68—112 V

—

PID Name

(Definition)

Unit/

Condition

Condition/Specification

 Auto Leveling 

Control Unit 

(Main) terminal

PID Name

(Definition)

Unit/Condition

Condition/Specification

 Auto Leveling 

Control Unit 

(Sub) 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

—

RHIDIGNV
(Auto leveling control unit (sub) input 
voltage)

VOLTAGE

Ignition switch at ON: 

B+

L

R_REFLECTOR
(Headlight leveling actuator angle control 
input signal sent from auto leveling 
control unit (main))

ANGLE

Ignition switch at ON: 

-5—4

°

P

STP_MTR_R
(Headlight leveling actuator (RH) current 
position)

STEP

Headlight switch at ON: 

12—520

Q,R,S,T

PART#SUF*
(Part number identification should be 
displayed)

—

—

—

SERIAL#1*
(Auto leveling control unit serial number 
part 1 should be displayed)

—

—

—

SERIAL#2*
(Auto leveling control unit serial number 
part 2 should be displayed)

—

—

—

SOFTVER*
(Software version number should be 
displayed)

—

—

—

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

—

T–148

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM] 

TBODY ELECTRICAL SYSTEM

ACTIVE COMMAND MODE TABLE

A6A816467000W13

LHID

Note

• Select the following four commands at the same time and carry out simulation inspection.

End Of Sie

DTC B1932

A6E816467000W03

Diagnostic procedure

End Of Sie

DTC B2141, B2477

A6E816467000W04

Diagnostic procedure

End Of Sie

ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]

Command name

Definition

CALAXLSN#

Command for headlight zeroset use (See 

T–31 HEADLIGHT ZEROSET

)

Command name

Definition

Operation

Note

HDL_POS#

Select “Calibration” operation, verify that the headlight actuator 
moves to the position at time of headlight zeroset

Calibration/

High/Low/Auto

Ignition key at ON 

(Engine OFF), and 

headlight ON

Select “High” operation, verify that headlight actuator moves 
upward

Select “Low” operation, verify that headlight actuator moves 
downward

Select “Auto” operation, verify that headlight actuator is under 
automatic control

DTC B1932

Auto leveling control unit 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 

T–25 

DISCHARGE HEADLIGHT SERVICE WARNINGS

Auto leveling control unit does not work properly.

POSSIBLE 

CAUSE

• Auto leveling control unit malfunction

• Poor fit of auto leveling control unit

STEP

INSPECTION

ACTION

1

INSPECT AUTO LEVELING CONTROL 

UNIT CONNECTION

• Check fit of auto leveling control unit.

• Is condition of the fit okay?

Yes

Replace auto leveling control unit.
(See 

T–30 DISCHARGE HEADLIGHT CONTROL UNIT 

REMOVAL/INSTALLATION

)

No

After correcting fit, clear DTC and check DTC again.

• If DTC is displayed again, replace auto leveling control 

unit. (See 

T–30 DISCHARGE HEADLIGHT CONTROL 

UNIT REMOVAL/INSTALLATION

)

DTC B2141, 

B2477

Configuration setting 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 

T–25 

DISCHARGE HEADLIGHT SERVICE WARNINGS

)

Configuration for auto leveling control unit is not set.

POSSIBLE 

CAUSE

• Configuration 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 configuration.
(See 

T–30 AUTO LEVELING CONTROL UNIT CONFIGURATION

)