Diagnostic Procedure

WARNING: This page is about a different car, the 2010 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1026:87 (ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY RELATED STORED DTC 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 DTC B1026:08, B1026:51, B1026:71 or B1026:96 also present?	Yes	Go to the applicable DTC inspection. (See DTC B1026:08 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .) (See DTC B1026:51 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .) (See DTC B1026:71 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .) (See DTC B1026:96 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .)
1		No	Go to the next step.
2	INSPECT STEERING LOCK UNIT CONNECTOR AND TERMINALS Switch the ignition to off. Disconnect the negative battery cable. Disconnect the steering lock unit 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 6.
2		No	Go to the next step.
3	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 6.
3		No	Go to the next step.
4	INSPECT STEERING LOCK UNIT COMMUNICATION CIRCUIT FOR OPEN CIRCUIT Steering lock unit and keyless control module connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Steering lock unit terminal G-Keyless control module terminal 21 Is there continuity?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 6.
5	INSPECT STEERING LOCK UNIT Reconnect the steering lock unit connector. Reconnect the negative battery cable. Inspect the steering lock unit. (See STEERING LOCK UNIT INSPECTION [WITH ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .) Is there any malfunction?	Yes	Replace the steering lock unit and perform the steering lock unit programming, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [WITH ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .) (See STEERING LOCK UNIT ID CODE REGISTRATION .)
5		No	Go to the next step.
6	VERIFY TROUBLESHOOTING COMPLETED Make sure to reconnect the disconnected connectors. Reconnect the negative battery cable. 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, 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 .)
6		No	Go to the next step.
7	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] .)
7		No	DTC troubleshooting completed.