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

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SECURITY INDICATOR LIGHT: 15, DTC: B13D3:51/P1260:00 [START STOP UNIT]

Description	Unregistered remote transmitter is detected
Detection condition	Start stop unit detects that the remote transmitter has not been programmed.
Fail-safe	Not applicable
Possible cause	Remote transmitter malfunction The remote transmitter is not programmed after replacing the start stop unit. Unprogrammed remote transmitter was used. Start stop unit malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY IF REMOTE TRANSMITTER BROUGHT INTO VEHICLE IS FOR THAT VEHICLE Does the remote transmitter belong to another vehicle?	Yes	Have the correct remote transmitter for the vehicle ready inside the vehicle, then go to Step 3.
		No	Go to the next step.
2	VERIFY IF MALFUNCTIONING LOCATION IS REMOTE TRANSMITTER DEPENDING ON REPEATABILITY Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Program key ID number of the remote transmitter. (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING.) Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the security indicator light: 15, DTC B13D3:51/P1260:00 displayed?	Yes	Replace the malfunctioning remote transmitter, then go to the next step. (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING.)
		No	Go to Step 4.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) Is the security indicator light: 15, DTC B13D3:51/P1260:00 displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
		No	Go to the next step.
4	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 [START STOP UNIT].)
		No	DTC troubleshooting completed.

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