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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 562 (ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)])SECURITY LIGHT 14, DTC B1602/P1260 [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]DIAGNOSTIC PROCEDURE

2010 Mazda 5 Sport, 2.3 L, Standard

Diagnostic Procedure

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.

B1602/P1260 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY WHETHER KEY IS VALID OR NOT Using another registered key, turn the ignition switch to the ON position. If there is not another registered key, register an additional key using the M-MDS and turn the ignition key to the ON position using the registered key. (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM] .) Is the DTC displayed again? Security light: 14 M-MDS: B1602/P1260	Yes	Replace the coil antenna, then go to the next step. (See COIL ANTENNA REMOVAL/INSTALLATION .)
1		No	Dispose of the malfunctioning key. Register a new key if necessary. (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM] .)
2	INSPECT INSTRUMENT CLUSTER Using another registered key, turn the ignition switch to the ON position. Is the DTC displayed again? Security light: 14 M-MDS: B1602/P1260	Yes	Replace the instrument cluster and perform the resetting procedure for the immobilizer system when replacing the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) (See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM] .)
2		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.