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.
DTC B0688: Security Indicator Circuit Fault: Description
Security indicator is a hard wired light to instrument panel cluster (IPC) and controlled by Passlock(tm) module. Security indicator light receives ignition voltage form the GAUGES fuse. When DTC B0688 sets, security indicator will illuminate. Security indicator may be illuminated when ignition switch is in OFF position, if security indicator control circuit is shorted to battery voltage. Current DTCs will clear after an ignition cycle occurs without the fault recurring. Passlock(tm) module history DTCs clear after 100 ignition cycles with no current codes active or using a scan tool.
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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.
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