Cobra 4160 Alarm Wiring Diagram Today

| Problem | Likely Cause | Fix | | :--- | :--- | :--- | | Alarm arms but doesn't trigger | Wrong door trigger type | Swap Blue (negative) to Green (positive) or vice versa. | | Siren is weak or silent | Bad ground on siren black wire | Run siren black directly to chassis. | | Alarm won't arm (LED solid) | Valet mode active | Turn ignition on/off 3 times, press valet button. | | Starter kill works but car won't start | Wires reversed on White/White-Black | Swap them. | | Parking lights flash but don't stay on | Low current output | Use an external relay (30A automotive relay). |

The Cobra 4160 features a DSC (Digital Selective Calling) alarm that sounds for distress relays. This guide explains how to wire an external warning device (horn/siren/LED) to the radio’s accessory outputs, as well as the basic power and antenna connections. cobra 4160 alarm wiring diagram

| Wire Color | Function | Connection Point | | :--- | :--- | :--- | | Green | Door Trigger Input (Negative) | Connect to the dome light circuit that shows ground when door opens (Japanese/European cars). | | Blue | Door Trigger Input (Positive) | Connect to the door pin switch that shows +12V when door opens (older GM/Domestic cars). | | Violet | Trunk/Hood Pin Input (Negative) | Connect to a pin switch on trunk or hood that grounds when open. | | Gray | Shock Sensor Input | Connects to the included shock sensor’s signal wire. | | Black/White | Auxiliary Output (Channel 3) | Typically used for trunk release or window roll-up (requires a relay). | | Brown/White | Starter Kill Relay (86 – Coil Trigger) | Part of starter interrupt. | | Yellow/Black | Dome Light Supervision Output | Provides ground to turn on interior light upon disarm (requires relay). | | Red/White | +12V Accessory for Optional Sensors | Powers glass break sensors or back-up batteries. | Pin 2 (Black Wire): Chassis Ground