Mazda 6. Manual - part 60

EXTERIOR LIGHTING SYSTEM 

T–19

T

T

Note

•

When the ignition switch is turned to ON, it is normal to hear the headlight leveling acutuator operating for 
a few second, as it verifies system operating condition.

•

When driving on a consistently rough or uneven road, the auto leveling function would cause a flickering 
effect for oncoming traffic. Therefore, to prevent the blinding of oncoming traffic, the auto leveling function 
is slowed down.

A6E8112T118

A6E8112T119

1

Zero setting

2

Acceleration

3

Deceleration

4

Auto leveling control unit (main)

5

Auto leveling control unit (sub)

6

Front auto leveling sensor

7

Rear auto leveling sensor

8

Headlight leveling actuator (LH)

9

Headlight leveling actuator (RH)

10

ABS/TCS HU/CM or DSC HU/CM

11

Difference between two voltage signals

12

Vehicle attitude

13

Acceleration degree calculation

14

Change in vehicle speed

15

Optical axis adjustment amount

16

Optical axis

17

Zero reference

18

High

19

Low

20

Vehicle speed

21

Time

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EXTERIOR LIGHTING SYSTEM 

End Of Sie

AUTO LEVELING CONTROL UNIT

A6E811201052T07

Function

•

In order to prevent the blinding of oncoming traffic and improve visibility, the auto leveling control units 
automatically control the optical axis direction for optimal illumination based on signal inputted from the ABS 
(DSC) HU/CM and the auto leveling sensor.

•

With an on-diagnostic function included for auto leveling control unit, servicing based on display of DTCs using 
the SST (WDS or equivalent) has been improved.

Structural View

Strucutre And Operation

•

The auto leveling control units (main and sub) are installed within the discharge control units, located under the 
front combination lights.

•

The auto leveling control unit (main) verifies changes in vehicle speed and attitude based on signal inputted 
from the ABS (DSC) HU/CM, and front and rear auto leveling sensors. The unit then calculates the optimal 
direction for the optical axis and sends signal to the auto leveling control unit (sub).

•

Based on the calculation of the optical axis adjustment amount, the auto leveling control unit controls the 
headlight leveling actuator.

Caution

•

After performing the following service items, configuration and zeroset must be performed using 
the WDS or equivalent.

×

:Applied

—:Not applied

*1 :  Execute headlight aiming for both headlights and together with headlight zeroset (which is performed by auto 

leveling control unit (main))

End Of Sie

A6E8112T120

1

Auto leveling control unit (main)

2

Auto leveling control unit (sub)

Service Item

Auto Leveling 

Control Unit 

Configuration

Headlight 

Zeroset

 *

1

Headlight 

Aiming

*

1

1

Auto leveling control unit (main or sub) replaced with new 
part.

×

×

×

2

Front combination light removal/installation

—

—

×

3

Front auto leveling sensor or rear auto leveling sensor 
replaced with new part, or harness or connector replaced 
with new part.

—

×

×

4

Front auto leveling sensor connector or rear auto leveling 
sensor connector removal.

—

×

×

5

Front auto leveling sensor or rear auto leveling sensor 
removal/installation.

—

×

×

EXTERIOR LIGHTING SYSTEM 

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T–20BODY ELECTRICAL SYSTEM

ON-BOARD DIAGNOSTIC FUNCTION

A6E811201052T10

Outline

•

The on-board diagnostic function is incorporated into the auto leveling control unit (main) and auto leveling 
control unit (sub). This function can narrow down headlight auto leveling system malfunction locations.

•

The on-board diagnostic function consists of the following functions: a failure detection function, which detects 
malfunctions in headlight auto leveling system-related parts; a memory function, which stores detected DTCs; 
a self-malfunction diagnostic function, which indicates system malfunctions using DTCs and warning lights; 
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

.

Failure Detection Function

•

The failure detection function in each headlight auto leveling system-related module 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.

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).

EXTERIOR LIGHTING SYSTEM

9

8

7

5

4

3

10

11

6

1

2

A6E8112T555

1

Auto leveling control unit (main)

2

Auto leveling control unit (sub)

3

Front auto leveling sensor

4

Rear auto leveling sensor

5

Headlight leveling actuator (LH)

6

Headlight leveling actuator (RH)

7

ABS/TCS HU/CM or DSC HU/CM

8

LHID

9

RHID

10

DLC-2

11

WDS or equivalent

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EXTERIOR LIGHTING SYSTEM 

DTC table

PID/Data Monitor Function

•

The PID/data monitoring function optionally selects monitored input/output signal items that are set in the auto 
leveling control unit (main) or the auto leveling control unit (sub), and performs read out in real time.

•

An SST (WDS or equivalent) is used to read out the PID/data monitor information.

PID/Data monitor table (LHID)

*

: Unnecessary for diagnosis

DTC Description

B1932

Auto leveling control unit system.

B2141

Configuration setting system for auto leveling control unit.

B2390

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

B2477

Auto leveling control unit setting system.

B2607

Auto leveling control unit controlling system.

B2615

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

B2616

Front auto leveling sensor signal system.

B2619

Rear auto leveling sensor signal system.

B2626

Headlight zerosetting system for auto leveling control unit.

B2735

Headlight leveling actuator signal system.

PID name

Definition

Operation/unit

(WDS or equivalent)

CCNT

Number of continuous trouble codes

—

ONDEMDTC

Number of on-demand trouble codes

—

LHIDIGNV

Auto leveling control unit (main) input voltage

VOLTAGE

F_CAL

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

VOLTAGE

F_LEVEL

Current input signal sent from front auto leveling sensor

VOLTAGE

R_CAL

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

VOLTAGE

R_LEVEL

Current input signal sent from rear auto leveling sensor

VOLTAGE

L_REFLECTOR

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

ANGLE

STP_MTR_L

Headlight leveling actuator (LH) current position

STEP

LHID_VSS

Vehicle speed input signal from ABS/TCS HU/CM

KPH

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

GDL_P_L

Output power to discharge headlight bulb (LH)

WATT

GDL_V_L

Output voltage to discharge headlight bulb (LH)

VOLTAGE