B1679
Alarm Panic Input Circuit Short To Battery
Body Chassis/Safety Alarm System 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The panic alarm button circuit is receiving excessive voltage, like a light switch stuck in the ON position due to a short wire touching the battery. This prevents the alarm system from functioning properly.

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Symptoms You May Notice
3 known symptoms for this code
Panic alarm button does not work or is unresponsive
Alarm system remains triggered or constantly active
Dashboard warning light for security/alarm illuminated
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the panic input circuit voltage level to detect button presses. When the circuit shorts directly to battery voltage, the ECU reads a constant high signal instead of the normal low state, preventing proper button detection and alarm triggering.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Panic Input Voltage 0.5V - 4.5V (varies with button state) >11V (shorted to battery)
Circuit Resistance 10kΩ - 100kΩ (open/pressed states) <1Ω (direct short)
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the panic button connector at the door module or steering wheel to eliminate poor connection.
2
Panic button switch
Replace the panic button if stuck or internally shorted to restore normal circuit operation.
3
Wiring and protective loom
Check for damaged insulation or pinched wires in the panic circuit harness and repair or replace affected sections.