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

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DTC B1D01:13 [AUTO LEVELING CONTROL MODULE]

Description	Headlight (RH) circuit malfunction
Detection condition	The auto leveling control module detected an open circuit in the headlight (RH) circuit during the headlight LO on control with the ignition switched ON (engine off or on).
Fail-safe	Control of the headlight auto leveling system is continued.
Possible cause	DTCs are stored in the electrical supply unit (ESU). Headlight LO (RH) circuit malfunction Front combination light (RH) connector or terminal malfunction Auto leveling control module connector or terminal malfunction Short to ground in wiring harness between auto leveling control module terminal H and front combination light (RH) terminal N Open circuit in wiring harness between auto leveling control module terminal H and front combination light (RH) terminal N Front combination light (RH) malfunction Auto leveling control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ELECTRICAL SUPPLY UNIT (ESU) DTCs Retrieve the electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].) Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRICAL SUPPLY UNIT (ESU)].)
		No	Go to the next step.
2	INSPECT FRONT COMBINATION LIGHT (RH) CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the front combination light (RH) 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 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.
4	INSPECT HEADLIGHT (RH) MALFUNCTION DETECTION CIRCUIT FOR SHORT TO GROUND Verify that the front combination light (RH) and auto leveling control module connectors are disconnected. Inspect for continuity between front combination light (RH) terminal N (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between auto leveling control module terminal H and front combination light (RH) terminal N. 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.
5	INSPECT HEADLIGHT (RH) MALFUNCTION DETECTION CIRCUIT FOR OPEN CIRCUIT Verify that the front combination light (RH) and auto leveling control module connectors are disconnected. Inspect the wiring harness for continuity between auto leveling control module terminal H (wiring harness-side) and front combination light (RH) terminal N (wiring harness-side). 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 auto leveling control module terminal H and front combination light (RH) terminal N. 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	VERIFY IF MALFUNCTIONING LOCATION IS FRONT COMBINATION LIGHT (RH) DEPENDING ON REPEATABILITY Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Clear the DTC for the auto leveling control module using the M-MDS. (See CLEARING DTC [AUTO LEVELING CONTROL MODULE].) Operate the light switch to the HEAD position and the dimmer switch to the LO position. Retrieve the auto leveling control module DTCs using the M-MDS. (See DTC INSPECTION [AUTO LEVELING CONTROL MODULE].) Is the same DTC displayed?	Yes	Replace the front combination light (RH), then go to the next step. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
		No	Go to Step 8.
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 DTC for the auto leveling control module using the M-MDS. (See CLEARING DTC [AUTO LEVELING CONTROL MODULE].) Operate the light switch to the HEAD position and the dimmer switch to the LO position. 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. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
		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 [AUTO LEVELING CONTROL MODULE].)
		No	DTC troubleshooting completed.

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