Jaltest (JDC203A) | Mercedes 14-pins OBD1 - 16-pins OBD2 Adapter Cable | Commercial and Work Vehicle
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Warranty directly via AsTools
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2 years warranty on all products
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The Jaltest JDC203A connects the round 14-pin diagnostic connector of older Mercedes-Benz commercial vehicles to the 16-pin OBD2 input of your Jaltest diagnostic cable. On the vehicle side there is a black round connector with a knurled coupling ring and fourteen pins in a circular pattern. The cable is 28 to 30 cm long and the connection is located in the cab.
With the cable connected, the Jaltest software accesses the control units behind the connector, from the engine control MR and driving control FR to brakes, air suspension and the instrument panel. How many units there are depends on the series: an SK/MK/LK from the nineties has only a fraction of what an Actros has. The cable works with the Jaltest Link V8.1 and V9 and falls under Jaltest CV.
Advantages
Points to note
Applications and functions
The cable is intended for workshops that read out older Mercedes-Benz trucks, distribution trucks and Unimogs with the Jaltest Link. An Atego distribution truck carries different modules to an Actros tractor unit; the units listed below come from Jaltest's Mercedes-Benz coverage.
Control units you can access
- MR: Engine control with unit pumps.
- FR: Driving control.
- GS, AG and KS: Gear shifting and clutch.
- ABS 6 and BS: Anti-lock and brake control.
- RS: Retarder management.
- NR: Air suspension.
- INS and WS: Instruments and service.
- PSM: Programmable body module.
- ART, SPA and SRS: Distance, lane and airbag.
What you can do
- Fault codes: Read and clear per system.
- Measured values: View in figures and graphs.
- Components: Actuate and test parts.
- Parameters: Write settings back.
- Calibrations: Where Jaltest offers a procedure.
- Maintenance: Resetting the service counter.
How to use it
- Check the connector: Locate the round 14-pin connection in the cab.
- Connect: Plug the JDC203A in and tighten the coupling ring.
- Link pairing: Connect the OBD2 end to the diagnostic cable.
- Ignition on: Switch the ignition on, without starting the engine.
- Read out: Select Mercedes-Benz, the series and the system.
Compatible vehicles and applications
The connector determines compatibility, not the model. The cable fits Mercedes-Benz commercial vehicles with the round 14-pin diagnostic connection. The series in Jaltest CV coverage are listed below; the final year is October 2005, when the 16-pin OBD2 connection became mandatory for trucks.
Mercedes-Benz:
- SK / MK / LK: 1989 - 1998.
- Actros (MP1): 1996 - 2002.
- Actros 2 (MP2): 2002 - 2005.
- Atego (1st generation): 1998 - 2005.
- Axor: 2001 - 2005.
- Vario: 1996 - 2005.
- Econic: 1998 - 2005.
- Unimog U 300 / U 400 / U 500: 2000 - 2005.
Package contents
- 1x Jaltest (JDC203A) | Mercedes 14-pin OBD1 - 16-pin OBD2 Adapter Cable | Business and Commercial Vehicles
Technical specifications
General
- The brand of the cable or adapter. It often has to match the brand of your diagnostic tool.Brand
- Jaltest
- The type of product: a separate adapter cable, an adapter without a cable or a complete set.Product type
- Adapter cable
- The cable set that also includes this cable. If you already own that set, you do not need to buy the cable separately.Part of cable set
- Truck and bus cable set
Suitable for
- The brand of diagnostic tool the cable works with. A cable for one brand usually does not fit a tester of another brand.Compatible diagnostic tool
- Jaltest
- The version of the Jaltest Link interface the cable fits. Some cables only work with the latest V9.Jaltest Link version
- Link V8.1
- Link V9
- The Jaltest module required to use the cable. Without the correct licence, the cable will not work.Jaltest software module
- CV commercial vehicles
Connections
- The connector that plugs into the diagnostic port of the vehicle or machine. It must fit exactly.Vehicle-side connector
- 14-pin OBD1
- The connector on the side of your diagnostic tool or interface. Usually a 16-pin OBD2 connector.Tool-side connector
- 16-pin OBD2
Diagnostic functions
- Shows the current sensor readings while the vehicle is running. Useful for tracing faults.View live data
- Yes
- Allows you to activate components yourself to test whether they are faulty. This saves time when fault finding.Component activation
- Yes
- Allows you to adjust control unit settings and perform calibrations after repair or replacement.Parameters and calibrations
- Yes
- Allows you to reset the service message or service interval after maintenance.Service reset
- Yes
Size and weight
- Reference number
- JDC203A
Other specifications
- Application
- Mercedes-Benz commercial vehicles with round 14-pin diagnostic connector
- Length
- 28 - 30 cm
- Control units
- MR (engine), FR (driving control), GS, AG and KS (drivetrain), ABS 6 and BS (brakes), RS (retarder), NR (air suspension), INS and WS (instrument panel and maintenance), PSM, ART, SPA and SRS
- Segment
- Business and Work Vehicle
- Part of cable set
- Truck and bus cable set (29362)
- Required for use
- Jaltest Link V8.1 or V9 with OBD2 diagnostic cable, Jaltest software with licence for Jaltest CV

To ensure you always have access to the latest software updates and releases for your Jaltest device, it's important that you register the correct distributor.
Only the authorized distributor can perform new software installations and updates. When you designate us as your distributor, we can handle this for you and guarantee that your device stays current and runs smoothly.
How does it work?
-
Download and complete the change form
You can find the form as a PDF file here. -
Send us the completed form
You can easily do this by email to support@astools.eu. -
We'll take care of the rest
With the form, we can notify Jaltest of the change and officially register you as our customer.






