Vito W639 Rear Light Wiring Diagram - Mercedes

Here is the detailed guide and wiring information for the .

| Relay Input | Connect to Van Wire (Color) | | :--- | :--- | | Tail (58) | Black/White (pre) or White/Black (post) | | Left turn (L) | Black/Yellow or White/Yellow | | Right turn (R) | Black/Yellow (right side) | | Brake (54) | Black/Red or White/Red | | Reverse (R) | Black/Blue or White/Blue | | Fog (NL) | Black/Purple or White/Purple (left only) | | Ground (31) | Brown | 5. Connector Pinout (Visual Reference) Looking at the rear light connector (female side, on vehicle harness) : mercedes vito w639 rear light wiring diagram

Since the W639 Vito (and identical Viano) underwent a facelift in 2010, the wiring changed significantly. Below are the diagrams for and Facelift (2010-2014) , plus the common towing module integration. 1. Pre-Facelift (2003–2010) – Standard Bulbs This version uses P21W (single filament) and P21/5W (dual filament) bulbs. No CAN-bus monitoring for bulbs (uses thermal flasher relay). Left Side (Driver Side – LHD / Nearside – RHD) | Wire Color | Function | Bulb Type | Pin on Connector | | :--- | :--- | :--- | :--- | | Brown | Ground (Earth) | All bulbs | Pin 1 | | Black/White | Tail light (Side light) | P21/5W (5W) | Pin 2 | | Black/Red | Brake light | P21/5W (21W) | Pin 3 | | Black/Yellow | Turn signal | P21W (21W) | Pin 4 | | Black/Blue | Reverse light | P21W (21W) | Pin 5 | | Black/Purple | Rear fog light (left side only) | P21W (21W) | Pin 6 | Right Side (Passenger Side) | Wire Color | Function | Bulb Type | Pin on Connector | | :--- | :--- | :--- | :--- | | Brown | Ground | All bulbs | Pin 1 | | Black/White | Tail light | P21/5W (5W) | Pin 2 | | Black/Red | Brake light | P21/5W (21W) | Pin 3 | | Black/Yellow | Turn signal | P21W | Pin 4 | | Black/Blue | Reverse light | P21W | Pin 5 | | Not used | No fog light on right | – | Pin 6 | Note: Some early W639 vans (2003-2006) use Grey instead of Black as the base color for positive wires. 2. Facelift (2010–2014) – LED & Bulb Hybrid The facelift uses a Lighting Control Module (SAM - Signal Acquisition Module) . It uses PWM (Pulse Width Modulation) and checks for broken bulbs. Do not probe with a test light to ground – use a multimeter or LED tester. Left Side (Rear light assembly) | Wire Color | Function | Notes | | :--- | :--- | :--- | | Brown | Ground | Thick wire | | White/Black | Tail light (LED) | 12V PWM | | White/Red | Brake light (LED) | 12V PWM | | White/Yellow | Turn signal (Bulb) | 12V pulsed | | White/Blue | Reverse light (Bulb) | 12V constant | | White/Purple | Rear fog light (Bulb) | Left side only | Right Side | Wire Color | Function | Notes | | :--- | :--- | :--- | | Brown | Ground | Thick wire | | White/Black | Tail light (LED) | 12V PWM | | White/Red | Brake light (LED) | 12V PWM | | White/Yellow | Turn signal (Bulb) | 12V pulsed | | White/Blue | Reverse light (Bulb) | 12V constant | | Not present | No fog light | | Important: Facelift models often have a separate license plate light wire (Grey/Black) that runs independently to the SAM, not through the rear light connector. 3. Common Problems & Fixes (W639) | Symptom | Likely Cause | Fix | | :--- | :--- | :--- | | One tail light dim/off | Corroded ground (brown wire) | Clean ground point behind rear trim (left side) | | Fast blinking turn signal | Bulb failure or wrong LED bulb | Use standard P21W or CAN-bus LED | | Brake light stays on faintly | Water in connector or SAM failure | Dry connector, check for 12V backfeed | | No reverse light on one side | Broken wire in rubber bellows (tailgate hinge) | Inspect black/blue (pre) or white/blue (post) wire | | Rear fog light on wrong side | Bulb in right side housing (facelift) | Remove bulb – only left side is wired | 4. Trailer/Towing Module Integration (Retrofit) If adding a trailer socket (13-pin or 7-pin), you must use a bypass relay (e.g., Mercedes part or universal like Pyramid 7-way ). Do not cut into the facelift LED wires directly – the SAM will detect overcurrent and shut down. Here is the detailed guide and wiring information for the

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