DTC B1044:01 [HEADLIGHT AUTO LEVELING SYSTEM]

id0902i7934200

Description

Auto leveling sensor circuit malfunction

Detection condition

•  Auto leveling control module detected the auto leveling sensor circuit voltage of 0.25 V or less or 4.75 V or more for 10 s or more with the ignition switched ON (engine off or on).

Fail-safe function

•  The headlight leveling actuator is stopped at the position when the malfunction is determined.

Possible cause

•  Auto leveling sensor connector or terminal malfunction

•  Auto leveling control module connector or terminal malfunction

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

―  Auto leveling control module terminal I—Auto leveling sensor terminal C

―  Auto leveling control module terminal K—Auto leveling sensor terminal B

―  Auto leveling control module terminal C—Auto leveling sensor terminal A

•  Short to power supply in wiring harness between the following terminals:

―  Auto leveling control module terminal I—Auto leveling sensor terminal C

―  Auto leveling control module terminal K—Auto leveling sensor terminal B

―  Auto leveling control module terminal C—Auto leveling sensor terminal A

•  Open circuit in wiring harness between the following terminals:

―  Auto leveling control module terminal I—Auto leveling sensor terminal C

―  Auto leveling control module terminal K—Auto leveling sensor terminal B

―  Auto leveling control module terminal C—Auto leveling sensor terminal A

•  Auto leveling sensor malfunction

•  Auto leveling control module malfunction

Description	Auto leveling sensor circuit malfunction
Detection condition	• Auto leveling control module detected the auto leveling sensor circuit voltage of 0.25 V or less or 4.75 V or more for 10 s or more with the ignition switched ON (engine off or on).
Fail-safe function	• The headlight leveling actuator is stopped at the position when the malfunction is determined.
Possible cause	• Auto leveling sensor connector or terminal malfunction • Auto leveling control module connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Auto leveling control module terminal I—Auto leveling sensor terminal C ― Auto leveling control module terminal K—Auto leveling sensor terminal B ― Auto leveling control module terminal C—Auto leveling sensor terminal A • Short to power supply in wiring harness between the following terminals: ― Auto leveling control module terminal I—Auto leveling sensor terminal C ― Auto leveling control module terminal K—Auto leveling sensor terminal B ― Auto leveling control module terminal C—Auto leveling sensor terminal A • Open circuit in wiring harness between the following terminals: ― Auto leveling control module terminal I—Auto leveling sensor terminal C ― Auto leveling control module terminal K—Auto leveling sensor terminal B ― Auto leveling control module terminal C—Auto leveling sensor terminal A • Auto leveling sensor malfunction • Auto leveling control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT AUTO LEVELING SENSOR CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Disconnect the auto leveling sensor connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 7.
2	INSPECT AUTO LEVELING CONTROL MODULE CONNECTOR CONDITION • Disconnect the auto leveling control module connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT FOR SHORT TO GROUND IN AUTO LEVELING SENSOR CIRCUIT • Verify that the auto leveling sensor and auto leveling control module connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Auto leveling sensor terminal C ― Auto leveling sensor terminal B ― Auto leveling sensor terminal A • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Auto leveling control module terminal I—Auto leveling sensor terminal C • Auto leveling control module terminal K—Auto leveling sensor terminal B • Auto leveling control module terminal C—Auto leveling sensor terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 7.
3		No	Go to the next step.
4	INSPECT FOR SHORT TO POWER SUPPLY IN AUTO LEVELING SENSOR CIRCUIT • Verify that the auto leveling sensor and auto leveling control module connectors are disconnected. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): ― Auto leveling sensor terminal C ― Auto leveling sensor terminal B ― Auto leveling sensor terminal A • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Auto leveling control module terminal I—Auto leveling sensor terminal C • Auto leveling control module terminal K—Auto leveling sensor terminal B • Auto leveling control module terminal C—Auto leveling sensor terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 7.
5	INSPECT FOR OPEN CIRCUIT IN AUTO LEVELING SENSOR CIRCUIT • Verify that the auto leveling sensor and auto leveling control module connectors are disconnected. • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Inspect for continuity between the following terminals (wiring harness-side): ― Auto leveling control module terminal I—Auto leveling sensor terminal C ― Auto leveling control module terminal K—Auto leveling sensor terminal B ― Auto leveling control module terminal C—Auto leveling sensor terminal A • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Auto leveling control module terminal I—Auto leveling sensor terminal C • Auto leveling control module terminal K—Auto leveling sensor terminal B • Auto leveling control module terminal C—Auto leveling sensor terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	INSPECT AUTO LEVELING SENSOR • Inspect the auto leveling sensor. (See AUTO LEVELING SENSOR INSPECTION.) • Is the auto leveling sensor normal?	Yes	Go to the next step.
6		No	Replace the auto leveling sensor, then go to the next step. (See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the disconnected negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the auto leveling control module using the M-MDS. (See CLEARING DTC [HEADLIGHT AUTO LEVELING SYSTEM].) • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Retrieve the auto leveling control module DTCs using the M-MDS. (See DTC INSPECTION [HEADLIGHT AUTO LEVELING SYSTEM].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [HEADLIGHT AUTO LEVELING SYSTEM].)
8		No	DTC troubleshooting completed.