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 MANUALSMITSUBISHI2009LANCER L4-2.4L (4B12)REPAIR AND DIAGNOSISRESTRAINTS AND SAFETY SYSTEMSAIR BAG SYSTEMSAIR BAG CONTROL MODULESERVICE AND REPAIR
2009 Mitsubishi Lancer L4-2.4L (4B12)
Air Bag Control Module: Service and Repair
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Service and Repair
SRS CONTROL UNIT (SRS-ECU)
REMOVAL AND INSTALLATION
WARNING:
- Never attempt to disassemble or repair the SRS-ECU. If faulty, replace it.
- Do not drop or subject the SRS-ECU to impact or vibration. If denting, cracking, deformation, or rust are discovered in the SRS-ECU, replace it with a new SRS-ECU.
- After deployment of an air bag, replace the SRS-ECU with a new one.
- Never use an ohmmeter on or near the SRS-ECU, and use only the special test equipment described.
REMOVAL SERVICE POINTS
[A] NEGATIVE (-) BATTERY CABLE DISCONNECTION
DANGER: Wait at least 60 seconds after disconnecting the battery cable before doing any further work.
WARNING: Battery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.
Disconnect the negative (-) battery cable from the battery and tape the terminal to prevent accidental connection and deployment.
[B] SRS-ECU REMOVAL
While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever.
INSTALLATION SERVICE POINTS
[A] SRS-ECU INSTALLATION
WARNING: The SRS may not activate if the SRS-ECU is not installed properly, which could result in serious injury or death to the vehicle's driver or front passenger.
[B] SRS-ECU MOUNTING BOLT (GROUND BOLT) INSTALLATION
Check the head mark "E" and install the ground bolt.
[C] POST-INSTALLATION INSPECTION
1. Reconnect the negative (-) battery cable.
2. Turn the ignition switch to the "ON" position.
3. Does the "SRS" warning light illuminate for approximately seven seconds, and then go out?
4. If yes, the SRS system is functioning properly. If not, refer to Diagnostic Trouble Code Chart [SRS-ECU].
REMOVAL AND INSTALLATION
WARNING:
- Never attempt to disassemble or repair the SRS-ECU. If faulty, replace it.
- Do not drop or subject the SRS-ECU to impact or vibration. If denting, cracking, deformation, or rust are discovered in the SRS-ECU, replace it with a new SRS-ECU.
- After deployment of an air bag, replace the SRS-ECU with a new one.
- Never use an ohmmeter on or near the SRS-ECU, and use only the special test equipment described.
Pre-removal Operation:
Removal Steps 1-4:
REMOVAL SERVICE POINTS
[A] NEGATIVE (-) BATTERY CABLE DISCONNECTION
DANGER: Wait at least 60 seconds after disconnecting the battery cable before doing any further work.
WARNING: Battery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.
Disconnect the negative (-) battery cable from the battery and tape the terminal to prevent accidental connection and deployment.
[B] SRS-ECU REMOVAL
While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever.
INSTALLATION SERVICE POINTS
[A] SRS-ECU INSTALLATION
WARNING: The SRS may not activate if the SRS-ECU is not installed properly, which could result in serious injury or death to the vehicle's driver or front passenger.
[B] SRS-ECU MOUNTING BOLT (GROUND BOLT) INSTALLATION
Check the head mark "E" and install the ground bolt.
[C] POST-INSTALLATION INSPECTION
1. Reconnect the negative (-) battery cable.
2. Turn the ignition switch to the "ON" position.
3. Does the "SRS" warning light illuminate for approximately seven seconds, and then go out?
4. If yes, the SRS system is functioning properly. If not, refer to Diagnostic Trouble Code Chart [SRS-ECU].
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.