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

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STEERING LOCK FUNCTION DOES NOT OPERATE [SECURITY AND LOCKS]

Description	Switch the ignition from ON (engine off or on) to OFF and do not lock the steering when opening/closing the door.
Possible Causes	Open circuit in wiring harness between the following terminals: Start stop unit terminal 1P and door lock link switch (driver's side) terminal D Start stop unit terminal 1AF and ground Start stop unit terminal 2A and ground Start stop unit terminal 2B and ground Short to ground in wiring harness between start stop unit terminal 1P and door lock link switch (driver's side) terminal D Customer's mis-operation or misunderstanding

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY STEERING WHEEL CONDITION Operate the steering lock function with no load applied to the steering wheel. Does the steering lock function operate normally?	Yes	System is normal. (Explain the operation conditions to the customer.)
		No	Go to the next step.
2	INSPECT IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN START STOP UNIT AND DOOR LOCK LINK SWITCH (DRIVER-SIDE) Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Disconnect the start stop unit and door latch and lock actuator connector. Inspect for continuity between the following terminals (vehicle wiring harness). Start stop unit terminal 1P and door lock link switch terminal D 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. Start stop unit terminal 1P and door lock link switch terminal D 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. If there is no common connector: Repair or replace the wiring harness which has an open circuit. After replacement, go to Step 5.
3	INSPECT IF MALFUNCTION CAUSE IS SHORT TO GROUND IN WIRING HARNESS BETWEEN START STOP UNIT AND DOOR LOCK LINK SWITCH (DRIVER-SIDE) Verify that the start stop unit connector is disconnected. Inspect for continuity between the following wiring harness terminals (vehicle wiring harness side) and body ground. Start stop unit terminal 1P Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. Start stop unit terminal 1P and door lock link switch terminal D If there is a common connector: Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an short to ground to determine the malfunctioning location. Repair or replace the malfunctioning location. If there is no common connector: Repair or replace the wiring harness which has an short to ground. After replacement, go to Step 5.
		No	Go to the next step.
4	INSPECT IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN START STOP UNIT AND GROUND Verify that the start stop unit connector is disconnected. Inspect for continuity between the following terminals (vehicle wiring harness). Start stop unit terminal 1AF and ground Start stop unit terminal 2A and ground Start stop unit terminal 2B and ground 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. Start stop unit terminal 1AF and ground Start stop unit terminal 2A and ground Start stop unit terminal 2B and ground 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. If there is no common connector: Repair or replace the wiring harness which has an open circuit. After replacement, go to the next step.
5	VERIFY IF MALFUNCTION CAUSE WAS CORRECTED Is the steering lock operation normal?	Yes	Troubleshooting completed. (Explain the contents of the servicing to the customer.)
		No	If the malfunction has not been resolved, repeat the inspection from Step 1.

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