Mercedes-Benz Sprinter wiring harness replacement — W906, 2006–2025

Harness assemblies we build for the Mercedes-Benz Sprinter

Each assembly is a separate part number with its own drawing and test fixture, so you can order the complete set or replace one failed loom. All five share the same splice points as the factory harness.

Assembly	Build specification
Engine & ECU harness	Firewall-to-engine routing with injector, coil, O2, cam and crank branches, sealed ECU header and the OEM connector series retained so the loom plugs in without re-pinning.
Body / cabin harness	Main body loom carrying the fuse and relay block, BCM connectors, interior lighting, audio, immobilizer and convenience circuits on the original circuit count.
Upfitter & rear-body harness	Body-builder interface loom with its own fuse and relay block, so nothing is tapped into the OEM BCM.
HVAC & blower harness	Blower motor, resistor pack, evaporator sensor and cabin-fan sub-looms with heat-rated insulation.
Door & step harness	Sliding-door and electric-step loom on high-flex cable with sealed pass-through grommets.

Fitment

Chassis / generation	W906 / W907
Production years	2006–2025
Engine variants	2.1 CDI OM651 · 3.0 V6 CDI · 2.0 CDI OM654
Main markets	Global
Body styles	Commercial Van & Chassis Cab
Order basis	OEM part number, VIN, or physical sample

Known failure points on high-mileage Sprinters

These are the faults that bring Sprinter owners to us. If your symptom matches one of them, the loom — not the component — is usually the cause, and a section replacement is often enough.

• Upfitter interface loom faults after body conversion
• Rear-body loom chafe at the chassis-to-body joint
• AdBlue and NOx sensor sub-loom failure
• Sliding-door loom fatigue on parcel vans

How we build it

• Drawing first. We map your sample or OEM drawing into a circuit list, connector list and 2D layout, and send it for approval before production.
• Connector parity. The original connector series is retained for the W906 / W907 so the loom plugs into the existing ECUs, BCM and sensors without adapters or re-pinning.
• Wire spec matched to the branch. 0.35–0.5 mm² for signal, 1.0–2.5 mm² for lighting and motors, 4–6 mm² for feeds, with heat-rated insulation on engine-bay runs.
• 100% test. Continuity, short and pin-out test against the drawing; hipot where HV is involved; bend test on hinge loops. Test record ships with the carton.

Specifications

Wire	TXL / GXL stranded copper, 0.22–6 mm² (AWG 24–10)
Connectors	Sumitomo, Yazaki, Aptiv, TE, Molex, KET — original series or documented equivalent
Protection	Tape, corrugated conduit, heat-shrink breakouts, grommets, sealed pass-throughs
Temperature	-40 °C to +125 °C continuous, +150 °C engine-bay branches
Testing	100% continuity & pin-out · crimp pull test · bend test · salt spray on chassis runs
MOQ	50 sets per part number, 1 unit for a paid sample
Lead time	25–30 days production · 7–10 days sample
Warranty	24 months / 50,000 km against manufacturing defect

Mercedes-Benz Sprinter harness questions

What does a full wiring harness for a Mercedes-Benz Sprinter cost?

A complete set for a Mercedes-Benz Sprinter (W906 / W907, 2006–2025) typically runs USD 320–1,450 depending on circuit count, connector count and whether HV sections are included. A single engine or body assembly is USD 120–520. Send the OEM part number and a photo of the label for an exact figure — quotes are issued within 24 hours.

Can you supply a Mercedes-Benz Sprinter harness when the factory part is discontinued?

Yes. For discontinued Mercedes-Benz Sprinter looms we rebuild from your original harness: we map every circuit, identify the connector families and produce a new drawing. This is the standard route for the W906 / W907 generation now that dealer stock has dried up in most markets.

What is the lead time and MOQ for a Mercedes-Benz Sprinter harness?

Sample in 7–10 days after drawing approval, production in 25–30 days. MOQ is 50 sets per part number, with one unit accepted for a paid sample. Repeat orders on an approved drawing are faster because the test fixture is already built.