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THE HEADLIGHT AUTO LEVELING SYSTEM DOES NOT OPERATE IN RESPONSE TO VEHICLE POSTURE [HEADLIGHT AUTO LEVELING SYSTEM]

NOTE:

  • If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [HEADLIGHT AUTO LEVELING SYSTEM] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [HEADLIGHT AUTO LEVELING SYSTEM].)

Description

  • The headlight auto leveling system does operate in response to the number of occupants, cargo load in trunk, and the fuel level.

  • One side of the headlight leveling actuator does not operate.

Possible malfunction

  • Open circuit in wiring harness between AFS control module terminal O and headlight leveling actuator (LH)/(RH) terminal F

  • Short to ground in wiring harness between AFS control module terminal O and headlight leveling actuator (LH)/(RH) terminal F

  • Headlight leveling actuator malfunction

  • AFS control module malfunction

  • Open circuit in wiring harness between the following terminals:

    • AFS control module terminal P—Headlight leveling actuator (LH)/(RH) terminal I

    • AFS control module terminal M—Headlight leveling actuator (LH)/(RH) terminal L

  • Short to ground in wiring harness between the following terminals:

    • AFS control module terminal P—Headlight leveling actuator (LH)/(RH) terminal I

    • AFS control module terminal M—Headlight leveling actuator (LH)/(RH) terminal L

  • Poor installation of the auto leveling sensor

  • Auto leveling sensor malfunction

System wiring diagram

Diagnostic Procedure

Step

Inspection

Action

1

 DETERMINE IF MALFUNCTIONING LOCATION IS AUTO LEVELING SENSOR

  • Verify the malfunction symptom.

  • Does only one side of the headlight auto leveling system operate?

Yes

Go to the next step.

No

Go to Step 6.

2

 LEVELING OPERATION SIGNAL INSPECTION

Yes

Go to Step 8.

No

Go to the next step.

3

 INSPECT LEVELING OPERATION SIGNAL CIRCUIT FOR OPEN CIRCUIT

  • Inspect the wiring harness for continuity between the AFS control module and headlight leveling actuator on the side in which the auto leveling system does not operate.

    • AFS control module terminal O—Headlight leveling actuator (LH)/(RH) terminal F

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify if there is a common connector between AFS control module terminal O and headlight leveling actuator (LH)/(RH) terminal F.

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.

  • Repair or replace the malfunctioning location and go to Step 10.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit and go to Step 10.

4

 INSPECT LEVELING OPERATION SIGNAL CIRCUIT FOR SHORT TO GROUND

  • Inspect for continuity between the ground and the wiring harness between the AFS control module and headlight leveling actuator on the side in which the auto leveling system does not operate.

    • AFS control module terminal O—Body ground

  • Is there continuity?

Yes

Refer to the wiring diagram and verify if there is a common connector between AFS control module terminal O and headlight leveling actuator (LH)/(RH) terminal F.

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.

  • Repair or replace the malfunctioning location and go to Step 10.

    If there is no common connector:

  • Repair or replace the wiring harness which is shorted to ground and go to Step 10.

No

Go to the next step.

5

 DETERMINE IF MALFUNCTION CAUSE IS HEADLIGHT LEVELING ACTUATOR OR AFS CONTROL MODULE

Yes

Troubleshooting completed.

No

Replace the AFS control module and go to Step 10.

(See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION)

6

 INSPECT WIRING HARNESS BETWEEN HEADLIGHT LEVELING ACTUATOR AND AFS CONTROL MODULE FOR OPEN CIRCUIT

  • Inspect for continuity in the wiring harness between the following terminals:

    • AFS control module terminal P—Headlight leveling actuator (LH)/(RH) terminal I

    • AFS control module terminal O—Headlight leveling actuator (LH)/(RH) terminal F

    • AFS control module terminal M—Headlight leveling actuator (LH)/(RH) terminal L

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

  • AFS control module terminal P—Headlight leveling actuator (LH)/(RH) terminal I

  • AFS control module terminal O—Headlight leveling actuator (LH)/(RH) terminal F

  • AFS control module terminal M—Headlight leveling actuator (LH)/(RH) terminal L

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.

  • Repair or replace the malfunctioning location and go to Step 10.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit and go to Step 10.

7

 INSPECT WIRING HARNESS BETWEEN HEADLIGHT LEVELING ACTUATOR AND AFS CONTROL MODULE FOR SHORT TO GROUND

  • Inspect for continuity between body ground and the following terminals.

    • AFS control module terminal P

    • AFS control module terminal O

    • AFS control module terminal M

  • Is there continuity?

Yes

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

  • AFS control module terminal P—Headlight leveling actuator (LH)/(RH) terminal I

  • AFS control module terminal O—Headlight leveling actuator (LH)/(RH) terminal F

  • AFS control module terminal M—Headlight leveling actuator (LH)/(RH) terminal L

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.

  • Repair or replace the malfunctioning location and go to Step 10.

    If there is no common connector:

  • Repair or replace the wiring harness which is shorted to ground and go to Step 10.

No

Go to the next step.

8

 VERIFY AUTO LEVELING SENSOR INSTALLATION

  • Verify the auto leveling sensor installation condition.

  • Is a bracket bent, is there damage, or is a link disconnected?

Yes

Repair or replace the malfunctioning location and go to Step 10.

No

Go to the next step.

9

 AUTO LEVELING SENSOR INSPECTION

Yes

Replace the AFS control module.

(See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION)

Go to the next step.

No

Replace the auto leveling sensor.

(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION)

Go to the next step.

10
    VERIFY IF MALFUNCTION CAUSE IS CORRECTED

  • Switch the ignition to ACC or ON (engine off or on).

  • Does the LED headlight warning light illumination turn off?

Yes

Troubleshooting completed. (explain the contents of the servicing to the customer)

No

Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.

(See SYMPTOM TROUBLESHOOTING [HEADLIGHT AUTO LEVELING SYSTEM].)
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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