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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC B1044:01 [AUTO LEVELING CONTROL MODULE]

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	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 to off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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.
		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.
		No	Repair or replace the connector, then go to Step 7.
3	INSPECT AUTO LEVELING SENSOR CIRCUIT FOR SHORT TO GROUND 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.
		No	Go to the next step.
4	INSPECT AUTO LEVELING SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY Verify that the auto leveling sensor and auto leveling control module connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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.
		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 AUTO LEVELING SENSOR CIRCUIT FOR OPEN CIRCUIT Switch the ignition to off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Verify that the auto leveling sensor and auto leveling control module connectors are disconnected. 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.
		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.
		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. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Clear the auto leveling control module DTCs using the M-MDS. (See CLEARING DTC [AUTO LEVELING CONTROL MODULE].) 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 [AUTO LEVELING CONTROL MODULE].) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the auto leveling control module, then go to the next step. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUTO LEVELING CONTROL MODULE].)
		No	DTC troubleshooting completed.

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