Auto Headlamp Leveling System Diagnosis Hyundai Santa Fe III

DTC INDEX

DTC INDEX

Scheme 1

General Description

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. The AHLS ECU detects the vehicle speed to use it as a compensation factor for the actuator control. In other words, when the vehicle speed is low the actuator needs to respond slowly though the linkage of height sensor moves quickly. (response filter value is high) But when the vehicle speed is high, AHLS ECU operates the actuator quickly in proportion to the height sensor variation.

DTC Description

The AHLS ECU sets DTC C1212 if the speed signal line carries a higher frequency than defined maximum value (approx. 1760Hz) for 1.5 ± 0.5 seconds.

DTC Detecting Condition

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1. Connect GDS and Engine "ON".
2. Select "Vehicle Speed" parameter on the GDS. NOTE: (check wheel speed output value at ABS (ESC) system. And, check vehicle speed at ECM and Air conditioner system.)
3. Check the "vehicle speed" Parameter on the GDS. Specification : It is changeable according to vehicle speed
4. Are all the parameters normal? YES Fault is intermittent caused by poor contact in the sensor's and/or AHLS ECU connector or was repaired and AHLS ECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__verification-of-vehicle-repair) " procedure. NO Incorrect Vehicle Speed Output (Including ABS (ESC) wheel speed output): --> Repair or replace wheel speed sensor and ABS (ESC) system according to ABS (ESC) troubleshooting guide as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__verification-of-vehicle-repair) " procedure. Incorrect Vehicle Speed Output only at AHLS ECU: --> Go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__verification-of-vehicle-repair) " procedure.

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found? YES Repair as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__verification-of-vehicle-repair) " procedure. NO Go to " «SIGNAL CIRCUIT INSPECTION»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__signal-circuit-inspection) " procedure.

Signal circuit Inspection

1. Check vehicle speed sensor Ignition "OFF". Disconnect Auto Head Lamp Leveling Sensor harness connector. After lifting up the vehicle, keep the engine "ON" for measurement condition. Measure signal waveform at AHLS ECU harness connector. Specification : B+ Is "waveform" measured near the specified form in General information? YES This is a intermittent problem caused by poor contact of component or Control Unit. Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__verification-of-vehicle-repair) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. NO Check the dashboard, wheel speed sensor and ABS (ESC) system. Check for open/short in harness. Repair as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis__verification-of-vehicle-repair) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.

Verification of Vehicle Repair

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs) mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

ETM

For wiring diagram information, refer to appropriate SYSTEM WIRING DIAGRAMS article.

Scheme 4

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. The height sensor measures the angular displacement of lever by measuring the magnetic field of stator parts formed by rotation of rotor.

The AHLS ECU sets DTC C1255 if the usable range of ± 45° is overridden caused by separation of actuator clamping bolt or lifting of vehicle.

Scheme 5

1. Park the vehicle in a flat land and remove all the loads from the vehicle.
2. Connect GDS to Data Link Connector (DLC).
3. Monitor DTC (Diagnostics Trouble Code) on the GDS.
4. Monitor the "Sensor Angle" Parameter on the GDS. Specification : Below - 0.4 ± 2 DEG (Unloaded Vehicle Condition)
5. Is parameter displayed within the Specification? YES This is a intermittent problem caused by poor contact of component or Control Unit. Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. NO Go to "Inspection and Repair" procedure.

Scheme 6

Scheme 7

1. Check Status of Linkage of height sensor Check the separation or faulty assemblage of linkage of height sensor with the vehicle lifted. Has the problem found? YES Repair as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Go to "AHLS-ECU" procedure.

Scheme 8

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Scheme 11

1. Engine "ON" and Head lamp "ON".
2. Lift the vehicle.
3. Disconnect the linkage of height sensor.
4. Monitor the "Sensor Angle" Parameter on the GDS while moving linkage vertically.
5. Is there any change in "Sensor Angle" Parameter? YES Fault is intermittent caused by poor contact in the AHLS ECU connector or was repaired and AHLS ECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. Check Head Lamp movement with actuation test and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Substitute with a known-good "AHLS ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs) mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 12

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. The height sensor measures the angular displacement of lever by measuring the magnetic field of stator parts formed by rotation of rotor.

To set the value of the initial position sensor, must be set the position between Magnet and Hall sensor. Otherwise it detects the DTC C1258.

Scheme 13

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Scheme 16

1. Check ECU (AHLS) Connect GDS to Data Link Connector (DLC). Engine "ON" and Head lamp "ON". Erase the DTC with GDS. Is it possible to erase the DTC with GDS? YES Check head lamp movement with actuation test, and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " Procedure. NO Substitute with a known-good "AHLS-ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS-ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 17

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. The height sensor measures the angular displacement of lever by measuring the magnetic field of stator parts formed by rotation of rotor.

AHLS ECU sets DTC C1367 if AHLS ECU detects no signal changes inside of axle (height) sensor while vehicle is driving over 30km/h (approx. 18.64 MPH) for 5min.

GDS Diagnostics

1. Connect GDS to Data Link Connector (DLC).
2. Engine "ON" and Head lamp "ON".
3. Erase the DTC with GDS.
4. Is it possible to erase the DTC with GDS? YES This is a intermittent problem caused by poor contact of component or Control Unit. Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure.

Scheme 18

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Scheme 21

1. Check ECU (AHLS) Engine "ON" and Head lamp "ON". Lift the vehicle. Disconnect the linkage of height sensor. Monitor the "Sensor Angle" Parameter on the GDS while moving linkage vertically. Is there any change in "Sensor Angle" Parameter? YES This is a intermittent problem caused by poor contact of component or Control Unit. Repair or replace as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Substitute with a known-good "AHLS ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 22

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. The height sensor measures the angular displacement of lever by measuring the magnetic field of stator parts formed by rotation of rotor.

The Hall sensor transfers to the MCU an angle of present sensor in the AHLS system.

If there are communication error or wrong signals, it sets the DTC C1381.

Scheme 23

Scheme 24

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Scheme 26

1. Check ECU (AHLS) Connect GDS to Data Link Connector (DLC). Engine "ON" and Head lamp "ON". Erase the DTC with GDS. Is it possible to erase the DTC with GDS? YES Check head lamp movement with actuation test, and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " Procedure. NO Substitute with a known-good "AHLS-ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS-ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs) mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 27

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. AHLS ECU detects the signal of headlamp switch which is operated by multi-function switch to diagnose the Headlamp light signal line.

AHLS ECU sets DTC C1522 if AHLS ECU detects HEAD Lamp signal circuit is open.

Scheme 28

1. Connect GDS with Diagnostic Connector.
2. Engine "ON" and Turn on the auto head light system.
3. Check the "HEAD LAMP status" parameter on GDS. Specification: When Head Lamp is ON: "ON"
4. Is the current data normal? YES This is a intermittent problem caused by poor contact of component or Control Unit. Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Go to "Inspection and Repair" procedure.

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found? YES Repair as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Go to " «SIGNAL CIRCUIT INSPECTION»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure.

1. Check power in harness Ignition "OFF". Disconnect Auto Head Lamp Leveling Sensor harness connector. Ignition "ON", HEAD LAMP "ON" (ENGINE "OFF"). Measure voltage between Head Lamp (LOW) ON/OFF Signal terminal of AHLS ECU harness connector and chassis ground. Specification : B+ Is "voltage" display near the specified value? YES Check the condition of connected part and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Check for circuit in harness between AHLS ECU and headlamp switch signal line. Repair as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

For wiring diagram information, refer to appropriate SYSTEM WIRING DIAGRAMS article.

Scheme 29

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and Headlamp actuator. AHLS ECU is composed of many IC components, such as A/D (AD converter), EEPROM, ROM, RAM and others. It also contains several different parameter-sets which defines the behavior in different car types and respect different mounting places. For efficient operation of system, The internal components of AHLS ECU (A/D, EEPROM, ROM, RAM) are checked internally during every start-up sequence.

The AHLS ECU sets DTC C1604 if one of component self-test result is negative.

Scheme 30

Scheme 31

Scheme 32

Scheme 33

1. Check ECU (AHLS) Connect GDS to Data Link Connector (DLC). Engine "ON" and Head lamp "ON". Erase the DTC with GDS. Is it possible to erase the DTC with GDS? YES Check head lamp movement with actuation test, and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " Procedure. NO Substitute with a known-good "AHLS-ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS-ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 34

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and Headlamp actuator. AHLS ECU is composed of many IC components, such as A/D (AD converter), EEPROM, ROM, RAM and others. It also contains several different parameter-sets which defines the behavior in different car types and respect different mounting places. For efficient operation of system, The internal components of AHLS ECU (A/D, EEPROM, ROM, RAM) are checked internally during every start-up sequence.

The AHLS ECU sets DTC C1606 if the parameter-sets are incompletely coded.

Scheme 35

Scheme 36

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Scheme 38

1. Check ECU (AHLS) Connect GDS to Data Link Connector (DLC). Engine "ON" and Head lamp "ON". Erase the DTC with GDS. Is it possible to erase the DTC with GDS? YES Check head lamp movement with actuation test, and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " Procedure. NO Substitute with a known-good "AHLS-ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS-ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 39

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. To ensure an optimum operation of the system, The AHLS (Auto Head Lamp Levelling System) has to be adjusted at end-of line procedure. The mechanical basic setting of the headlamps is to be performed with ignition being switched ON. It is important to adjust the system electronically and mechanically at the same place. Only by this way it is guaranteed that the car is in the same suspension condition.

The AHLS ECU sets DTC C1620 if the headlamp leveling system has not been adjusted since installation.

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Scheme 45

1. Connect GDS with Diagnostic Connector.
2. Perform vehicle selection and Level Initialization with GDS as follows. And then, check "Actuator" parameter on GDS. (It must be unloaded vehicle condition) Specification: 80% ± 2% .
3. Are "Vehicle selection & Level Initalization" and current data normal? YES Go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Substitute with a known-good "AHLS ECU (Sensor)" and check for proper operation. If the problem is corrected, replace "AHLS ECU (Sensor)" and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation. CAUTION: Perform Vehicle Selection and Level Initialization with GDS if AHLS ECU is replace. (Auto Levelling Sensor)

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

Scheme 46

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. AHLS ECU outputs the signal based on the driving and loading condition and delivers it to actuator, and then the actuator changes vertical direction of the headlamp.

AHLS ECU sets DTC C2226 If AHLS ECU detects Signal circuit of Actuator is short to ground or battery.

1. Connect GDS to Data Link Connector (DLC).
2. Engine "ON" and Head lamp "ON".
3. Erase the DTC with GDS.
4. Is it possible to erase the DTC with GDS? YES This is a intermittent problem caused by poor contact of component or Control Unit. Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Go to "Inspection and Repair" procedure.

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found? YES Repair as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Go to " «SIGNAL CIRCUIT INSPECTION»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure.

1. Check short to ground in harness Ignition "OFF". Disconnect AHLS ECU and leveling actuator (LH/RH) harness connector. Measure resistance between Signal terminal of leveling actuator (LH/RH) harness connector and chassis ground. Specification : Infinity Is the measured resistance within specification? YES Go to 2 Check short to battery in harness as follows. NO Check for short to ground in signal harness. Repair as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.
2. Check short to battery in harness Ignition "OFF". Disconnect AHLS ECU and leveling actuator (LH/RH) harness connector. Ignition "ON", HEAD LAMP "ON". (ENGINE "OFF") Measure voltage between Signal(+) terminal of leveling actuator (LH/RH) harness connector and chassis ground. Specification : 1V below Is the measured resistance within specification? YES Check the condition of connected part and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. NO Check for short to battery circuit in leveling actuator output harness. Repair as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(/hyundai/santa-fe/iii-2012-2016/remont/headlights/#auto-headlamp-leveling-system-diagnosis) " procedure. After its repair done, Perform the lamp actuation by GDS in order to verify its normal operation.

After a repair, it is essential to verifying that the fault has been corrected.

1. Connect GDS and select "Diagnostic Trouble Codes (DTCs) mode.
2. Using GDS, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System is performing to specification at this time.

For wiring diagram information, refer to appropriate SYSTEM WIRING DIAGRAMS article.

See also:
• DTC C1212
• VERIFICATION OF VEHICLE REPAIR
• SIGNAL CIRCUIT INSPECTION