Complete Viper 4105v Remote Start Wiring Guide with Diagram
Begin with the central control module–locate the 12-pin harness beneath the dashboard on the driver’s side. Pin 1 (red/white) connects to a constant 12V power source, preferably the battery’s positive terminal via a 15A fuse. Avoid ignition-switched circuits to prevent draining the battery.
For the starter interrupt relay, wire pin 3 (green/black) to the ignition coil’s negative side or the fuel pump relay, depending on your vehicle’s cut-off preference. Use a 30A diode between pin 3 and the relay coil to block voltage spikes. Without this, expect misfires or system failure.
The door trigger input (pin 6, brown/white) must link to the door ajar switch–grounded when closed, open when ajar. Test with a multimeter: resistance should drop to 0 ohms when the door shuts. If readings fluctuate, check for corroded contacts or frayed wires.
For LED status feedback, connect pin 9 (blue/white) to a dashboard indicator with a 1k ohm resistor in series. This prevents LED burnout while ensuring visible notification. Skip this step, and the system will still function, but troubleshooting becomes guesswork.
Remote antenna wiring requires precise placement: route the black/white lead (pin 12) directly to the antenna unit. Keep it at least 30 cm away from metal surfaces to avoid signal degradation. Tape securely–vibrations can loosen connections over time.
Grounding is critical: attach pin 4 (black) to a bare metal chassis point with a ring terminal and sandpaper the surface for a clean contact. Poor grounding causes erratic behavior, including false triggers or failed disarms.
Before finalizing connections, verify each wire’s continuity with a test light. Proceed methodically–skipping this step risks short circuits or permanent damage to the unit. If the siren activates during testing, revisit pin 5 (yellow/black) for proper connection to the alarm output.
Connecting Your Remote Starter: Key Schematics
Begin by locating the ignition harness on your vehicle’s main control module–typically a 6-pin plug labeled “IGN.” Pin 1 (white wire) must connect to the vehicle’s ignition output, Pin 2 (red) to a constant 12V power source, and Pin 3 (black) to ground. Confirm polarity with a multimeter before securing connections, as reversed wiring risks damaging the unit.
Critical Relay and Sensor Hookups
- Brake pedal switch (white/blue wire): Attach to the brake light circuit–failure here prevents engine engagement.
- Tachometer input (green wire): Tap into the ignition coil’s negative terminal for RPM signal; incorrect splicing causes erratic starts.
- Horn relay (gray wire): Route to the vehicle’s horn circuit for alarm chirps; omit if not using security features.
For automatic transmissions, the neutral safety wire (pink/black) requires splicing into the transmission range sensor. Manual transmissions need the clutch pedal switch (white/green) wired to the starter inhibit circuit. Missteps here lead to either non-start conditions or starter burnout.
Auxiliary outputs (blue/white and blue/yellow wires) support features like heated seats or window defrosters–link to the relevant 12V switched circuits. Use 18-gauge wire for these low-current connections to prevent voltage drop. Always test connections with the vehicle off before finalizing harness ties.
- Disconnect the battery negative terminal before handling any wires.
- Use solder sleeves or crimp connectors for permanent joins–twist-and-tape methods degrade over time.
- Route wires away from moving parts (steering column, pedals) and heat sources (exhaust, radiator).
- Label each wire at both ends to simplify troubleshooting.
- After installation, verify all functions via the remote: lock/unlock, start/stop, and accessory activation.
Finding the Security System Harness Interfaces
Begin by identifying the primary power distribution block beneath the dashboard–typically positioned near the vehicle’s fuse box. The main harness bundle branches into three key connectors: a 6-pin white plug (ignition/accessory inputs), a 4-pin black plug (door lock actuators), and a 2-pin red plug (siren or auxiliary outputs). Use a multimeter set to continuity mode to verify pin assignments if the original color-coding is obscured or altered.
| Connector Type | Pin Count | Typical Wire Colors | Function |
|---|---|---|---|
| White | 6 | Red, Black, Blue/White, Green/White, Yellow, Brown | Ignition sense, ground, starter interrupt, LED status |
| Black | 4 | Yellow, Green, Blue, White/Black | Door lock/unlock outputs (polarity-dependent) |
| Red | 2 | Red/Black, Black | Siren power (+12V) and negative trigger |
Tracing Obscured Connections
If connectors are tucked behind interior panels, remove the lower dashboard trim using a plastic pry tool–avoid metal tools to prevent scratching. Follow the bundle toward the firewall; a secondary harness often splits near the driver’s kick panel, linking to sensors (shock/tilt) or valet switch inputs. Label each segment with masking tape to prevent misalignment during reinstallation. For aftermarket installations, confirm compatibility with OEM modules by cross-referencing pin voltage under load (12V nominal, 9V minimum).
Step-by-Step Guide to Color-Coded Circuit Connections for 4105v Security Module
Start by identifying the red/white striped lead as the primary 12V constant power source. Connect this directly to the vehicle’s battery or an always-on fuse tap, ensuring a secure crimp with a 10A fuse no further than 7 inches from the power source to prevent voltage drops. Test continuity with a multimeter before finalizing the connection–resistance above 0.2 ohms indicates corrosion or insufficient contact.
The black wire serves as the ground, critical for stable operation. Attach it to a bare metal chassis point within 18 inches of the module’s mounting location, avoiding painted or coated surfaces. Sand the contact area to expose clean metal and use a star washer to improve conductivity. For vehicles with aluminum or composite frames, locate a factory ground bolt near the kick panel or under the dashboard.
Signal and Auxiliary Lead Handling
Match the green/white striped wire to the door trigger–this input requires a negative pulse to activate. Splice into the vehicle’s dome light wire (typically solid green or green/white in most makes) or use a dedicated door switch output if available. Verify the pulse duration with a test light; prolonged signals (over 3 seconds) may cause false alarms. For delayed triggers, insert a 1µF capacitor in parallel to smooth the signal.
The blue/white striped lead manages the starter disable function. Route this to the ignition system’s relay or starter solenoid, using a 30A diode to protect against backfeed. For push-to-start vehicles, tap into the immobilizer control wire instead–check the factory service manual for the correct pin number (usually a thin gauge wire). Confirm functionality by attempting ignition without the key fob; the engine should crank but fail to start.
For auxiliary outputs, the orange (trunk release) and pink/black striped (factory alarm integration) wires require precise matching. The orange lead connects to the trunk popsicle switch or a dedicated release actuator, using a 15A fuse for protection. The pink/black wire interfaces with OEM security systems via a negative trigger; consult the vehicle’s wiring schematic to identify the correct pin (often labeled as “Anti-Theft Output” or “Alarm Confirmation”). Use a relay if the current exceeds 200mA to prevent module damage.
Common Pinout Errors When Integrating Security Systems with Vehicle Electronics
Misconnecting the ignition input to the wrong fuse slot–typically those labeled “ACC” instead of a true 12V battery source–will cause intermittent power drops, triggering false alarms or preventing remote start cycles. Always validate the chosen fuse with a multimeter; sustained 12V should persist even with the key off. Avoid tapping into circuits controlled by body control modules, as these often incorporate low-current triggers that introduce voltage fluctuations unsuitable for system stability.
Reversing polarity on the ground and power leads during installation risks immediate fuse blowouts, overheating of the soldered joints, or permanent damage to the control unit’s internal regulators. Verify wire gauge compatibility–20-18 AWG for primary power and ignition inputs, 22 AWG for data lines–to prevent voltage sag under load. Incorrect grounding, such as attaching to painted surfaces or thin chassis bolts, introduces resistance that mimics sensor faults, particularly in shock detection modules.
Swapping the door trigger leads with trunk or hood pins will invert sensor logic, causing the alarm to arm when doors open or fail to trigger during forced entry attempts. Confirm pin assignments using the system’s reference guide: door triggers typically require negative polarity, while trunk/hood sensors operate on positive inputs. For vehicles with factory pulse-width modulated locks, avoid direct splicing; use a compatible lock interface module to prevent signal degradation or erratic actuator behavior.
Verifying Power Signals in Automated Entry Control Systems
Connect a multimeter set to DC voltage between the 12V input terminal and the designated motor relay output to confirm a steady 12.6V reading under load. Any deviation below 11.8V under active operation indicates either insufficient power supply capacity or resistive losses in the harness. Test each output channel independently, ensuring the polarity matches the schematic–reversed connections risk damaging the control board.
Check the momentary voltage spike at the relay coil terminals when triggering the unlock sequence. A healthy system will show a brief 9-12V pulse lasting 300-500ms, followed by a return to 0V. Absence of this pulse suggests a faulty relay or cut power feed from the main PCB. For auxiliary outputs, measure continuity to ground when activated–open circuits here reveal broken traces or disconnected actuators.
Use an oscilloscope to capture transient signals on the trigger wires during activation. The expected waveform should show a clean square wave with minimal ringing; excessive noise or slow rise times point to poor grounding or inadequate cable shielding. Test both positive and negative trigger inputs, as some configurations invert polarity for different functions.
Inspect each fuse holder with the meter in continuity mode before applying power. A blown fuse often correlates with shorted motor windings or corroded terminals–replace it only after isolating the fault to prevent immediate re-failure. For systems with battery backup, disconnect the main power and verify backup voltage falls within 0.3V of the primary supply to ensure seamless failover.
Measure the quiescent current draw of the module in standby by placing the meter in series with the main power feed. Values exceeding 15mA indicate parasitic loads from damaged components or improperly terminated safety circuits. If troubleshooting remote start outputs, confirm the voltage sag under cranking does not dip below 9V–values outside this range may prevent engine start engagement.