Universal · OBD cables
Adapter cable that physically converts the old type round Mercedes 38-pin diagnostic socket to a standard 16-pin OBD2 device connection.
The exact plan and total amount will be shown again at the payment step.
Verify that the diagnostic socket under your vehicle's hood is indeed a round 38-pin and that your main device supports a 16-pin input.
Product information
The adapter provides physical conversion between the old type Mercedes 38-pin diagnostic socket and a compatible device with a standard 16-pin OBD2 input. Not every round socket found on a vehicle is 38-pin; the body, pin count, and key orientation must be checked.
Physical Connection Coverage
Connecting the cable, adapter, or communication module to the vehicle does not prove that the vehicle is supported by the software. The physical connector, pin layout, main device, and vehicle software must be compatible simultaneously.
Product details
The gallery shows the round multi-pin vehicle connector and the standard 16-pin OBD2 female socket at the other end from four angles. This product is a passive adapter; it only carries the connected lines to the compatible device.
Product details
Compatibility is not determined solely by the Mercedes brand name. The pin count, key gaps, and position of the socket on the vehicle, along with the software scope of the device to be used and the control unit to be accessed, must be checked together. Connectors that are forced or do not seat properly are not used.
Product details
The package is one 38-pin to 16-pin adapter cable. The SD Connect C4/C5 main cable, diagnostic device, computer, software, and power cable are not included. Some control units in older vehicles may require separate power or different line routing.
Product details
The round diagnostic socket under the hood can accumulate moisture, dust, or oxidation over time. The contact is turned off before the adapter is plugged in; if bending, greening, or foreign matter is observed on the pins, cleaning is performed according to the manufacturer's service procedure. The adapter body is fitted in the direction of the key, and the cable is not twisted.
When finished, the 38-pin plug is removed by holding the body, the vehicle cover is closed again, and the adapter pins are protected against impact. This product is not an electrical wiring repair tool; forcing it into a damaged vehicle socket can damage both the adapter and the vehicle connection.
Product details
In an old Mercedes vehicle, first, the location of the diagnostic socket is confirmed from the service manual; opening the round cover alone is not proof of a 38-pin socket. With the socket de-energized, the number of pins, key gaps, and outer body are compared with the detailed photos in the gallery. If pins are missing, oxidized, or bent, the adapter is not installed.
The 38-pin end must be placed in the correct orientation and fit snugly into the body. The main device's OBD cable is connected to the 16-pin female socket on the other side of the adapter.
If a standard in-cabin OBD2 socket is also available on the vehicle, the control unit to be accessed and the manufacturer's procedure are checked to determine which connection to use; the two connections are not used randomly at the same time.
Product details
If the device is receiving power but no modules are visible, first check that the adapter is fully seated on the 38-pin end, the 16-pin connection is not loose, and the vehicle battery is sufficient.
In some older vehicles, not all lines merge into a single standard OBD protocol; the target module, main device's pin routing, and software coverage are important. If a comparison can be made with another known good adapter or device, the faulty part is isolated. Do not attempt by twisting the cable or applying external power to the pins.
If access is unavailable only on some control units, the vehicle schematic and XENTRY procedure should be reviewed, and the adapter should not be attributed non-existent electronic conversion functions.
Related pages
Technical Resources
Technical information verified with official sources on October 12, 2026.
FAQ
No. The product is for the round 38-pin socket; adapters for sockets with different pin counts and bodies are required.
Cannot be guaranteed. Access depends on the main device's hardware, software, vehicle wiring, and the control unit to be accessed.
No. The passive cable carries physical lines; protocol support is determined by the diagnostic device, software, and the network structure in the vehicle.
No. The pin count, key orientation, vehicle year, and the vehicle system to be connected must be checked. The round appearance alone is not proof of compatibility.
No. The sale only includes the 38-pin to 16-pin adapter; the C4/C5 main cable and diagnostic device are required separately.
Comparison
Compare products in the same class with information on usage level, service tasks, and price.
| Model | Level | Usage | Price | View |
|---|---|---|---|---|
| Mercedes 38 Pin - 16 Pin OBD2 Converter CableUniversal | Specialty operation |
| ≈ $401,990 TL charged · VAT included · import duties excluded | View |
| BMW 20 Pin OBD CableUniversal | Specialty operation |
| ≈ $401,990 TL charged · VAT included · import duties excluded | View |
| Renault CAN Clip OBD CableUniversal | Specialty operation |
| ≈ $401,990 TL charged · VAT included · import duties excluded | View |
| Autocom CDP+ Compatible OBD2 Main CableUniversal | Specialty operation |
| ≈ $401,990 TL charged · VAT included · import duties excluded | View |
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