Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20113 MAZDASPEED, 2.3 3REPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSON-BOARD DIAGNOSTIC [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]DTC B1026:4A [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]

2011 Mazda 3 Mazdaspeed, 2.3 3

DTC B1026:4A [Advanced Keyless Entry And Push Button Start System]

2011 Mazda 3 Mazdaspeed, 2.3 3SECTION DTC B1026:4A [Advanced Keyless Entry And Push Button Start System]

DESCRIPTION	Improper installation of steering lock unit
DETECTION CONDITION	Keyless control module detects voltage of steering lock unit GND terminal (terminal 1D) as less than 3.2 V for 0.2 s or more
POSSIBLE CAUSE	Keyless control module connector or terminals malfunction Parts are assembled which have no keyless control module configuration setting in terminal 1D Keyless control module malfunction

DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS Disconnect the keyless control module connector. Inspect the connector and terminals (corrosion, damage, pin disconnection). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 4.
1		No	Go to the next step.
2	PARTS ARE ASSEMBLED WHICH HAVE NO KEYLESS CONTROL MODULE CONFIGURATION SETTING Verify that parts are not assembled to the keyless control module terminal 1D. Are parts assembled?	Yes	Remove the parts and go to the next step.
2		No	Go to the next step.
3	VERIFY TROUBLESHOOTING COMPLETED Make sure to reconnect the disconnected connectors. Reconnect the negative battery cable. Operate the advanced key to activate the keyless control module. Clear the DTC from the keyless control module using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Switch the ignition to off using the advanced key, then open the door to lock the steering. Perform the advanced keyless entry and push button start system DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ). Is the same DTC present?	Yes	Replace the keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION ).
3		No	Go to the next step.
4	VERIFY THAT NO OTHER DTCs ARE PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] ).
4		No	DTC troubleshooting completed.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.