What Does B1680 Mean?
This code indicates that the Body Control Module (BCM) has detected a short to ground in the alarm panic button input circuit. The panic button circuit voltage has dropped below the expected threshold, causing the BCM to register a fault. This affects the vehicle's security and alarm system, specifically the panic function that activates the horn and lights when the panic button is pressed on the key fob or interior switch.
Common Causes
45%
Damaged or chafed wiring harness causing the panic input circuit to contact ground, typically at pinch points near doors, hood, or under seats
30%
Faulty panic button switch internally shorted to ground in key fob or dashboard switch assembly
15%
Corroded or water-damaged BCM connector terminals causing cross-circuit short to ground
10%
Failed Body Control Module with internal short circuit on panic input channel
Diagnostic Steps
1
Step 1: Perform visual inspection of panic button wiring harness from BCM to panic switches, checking for damaged insulation, chafing, or pinched wires at common failure points (door hinges, under seats, behind kick panels). Look for signs of water intrusion at connectors.
2
Step 2: Disconnect the BCM connector and use a digital multimeter to measure resistance between the panic input circuit terminal and ground. Reading should be infinite (open circuit). If resistance is low (under 10 ohms), the short is in the wiring harness or switches.
3
Step 3: Disconnect panic button switches (key fob receiver connector and any interior panic switches) one at a time and recheck resistance to ground. If resistance returns to infinite after disconnecting a switch, that switch is faulty. If resistance remains low, wiring harness is shorted.
4
Step 4: If wiring and switches test good, inspect BCM connector for corrosion, pushed-back pins, or water damage. Clean and repair connector as needed. If connector is good, suspect internal BCM failure.
5
Step 5: Repair or replace faulty component (wire harness, switch, or BCM). Reconnect all components, clear codes, and cycle panic button function multiple times to verify proper operation and confirm no code return.
Estimated Repair Cost
$75 - $650
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a short to ground in the alarm panic button input circuit. The panic button circuit voltage has dropped below the expected threshold, causing the BCM to register a fault. This affects the vehicle's security and alarm system, specifi...
The most common cause of B1680 (Alarm Panic Input Circuit Short To Ground) is: Damaged or chafed wiring harness causing the panic input circuit to contact ground, typically at pinch points near doors, hood, or under seats
Typical repair costs for B1680 range from $75 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle drivability or safety systems and is safe to drive. The panic alarm function may not work properly, reducing emergency alert capability, but repair is not urgent.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1680 to identify the root cause.
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Quick Info
Category
Body
System
Vehicle Security and Alarm System
Difficulty
Type
Manufacturer
Recommended Tools
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