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.
Chart F - DERM Cannot Communicate Through Serial Data Line: Description
When DERM recognizes IGNITION 1 voltage, applied to terminals A9 and A10, is in normal operating voltage range, AIR BAG light is flashed 7 times to verify operation. At this time DERM performs TURN-ON tests followed by CONTINUOUS MONITORING tests. When no malfunctions are detected, DERM proceeds to INITIATOR ASSEMBLY RESISTANCE TEST. When a malfunction is detected, DERM sets a current diagnostic trouble code and turns on AIR BAG light. DERM will clear current diagnostic trouble codes and move them to a history file when malfunction is no longer detected and/or ignition switch is cycled, except for DTC 51. DTC 51 can only be cleared using Tech 1 scan tester.
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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.