Troubleshooting INPA IFH-0009: How to Fix "No Response from Control Unit"

If you experience the IFH-0009 No Response error in INPA, it indicates a breakdown (or lack of) communication between the vehicle and the laptop. More often than not, IFH-0009 errors in INPA are caused by the following issues:

1. Poor quality or incorrectly wired interfaces: IFH-0009 errors are most common with D-Can+K USB interface leads. Often, these interfaces originate from China or Hong Kong, and they may be poorly constructed, incorrectly wired, or contain the wrong chipset drivers—or no drivers at all! While not all Chinese interfaces are of poor quality, buying cheap, imported leads is a gamble, and when problems arise, the seller is often unresponsive. It is crucial to buy an interface lead from a reputable vendor with good quality.

2. Wrong or incorrect interface drivers: Mass-produced interfaces often come with CDs containing the wrong chipset drivers, or sometimes with no CD at all. Without the correct (latest) USB drivers, your interface lead will not install properly under Windows. Our software package includes a popular driver that is compatible with most Chinese and Western-produced USB interfaces, which will often work if the driver provided by your interface lead vendor doesn’t or hasn’t been included.

3. Incorrectly configured interface lead: This is another common issue with USB-type leads. When installing a D-Can or USB interface lead, you need to reconfigure the Windows-based COM port settings so that the USB lead appears to replicate an old RS-232 serial port. To replicate the port correctly, change the COM port setting of the USB interface in Windows to COM Port 1, set the latency to ‘1’, and check any ‘FIFO’ box.

4. Incorrectly wired interface: There is no set standard for the pin wiring configurations used within D-Can + K interfaces by various manufacturers. Some interface leads have pin 8 disconnected, others have pin 8 physically linked (bridged) to pin 7, and some have pins 7 and 8 connected individually with no bridge link. If you still have problems connecting to the vehicle and continue to receive ‘IFH’ style errors, you should open the OBD socket of the lead and check the pin wiring to identify the type of interface you have. You should try your interface lead with the following configurations:

   • Pin 8 joined to Pin 7 using a small wire link.

   • Pin 8 is physically disconnected.

   • Pin 7 and Pin 8 are individually connected to their pins with no link.

More often than not, one of these configurations will work with your vehicle. I recommend trying it with pins 7 and 8 linked together first, as this is the most popular vehicle configuration. Also, don’t assume that once you find the pin 8 solution that works with one vehicle, it will automatically work with another model. If you have more than one D-Can-equipped vehicle, you may need to obtain a second interface lead and configure ‘pin 8’ differently.

If you don’t own a soldering iron or don’t feel confident about soldering electrical connectors, there are adaptors available that will bridge pins 7 and 8 together without the need to open the OBD socket or solder.

5. Incomplete versions of INPA: There are many versions of INPA around, many of which are incomplete or lack the necessary configuration files to work correctly. If you have tried all of the above and the IFH-0009 problem still persists, you will need to consider buying and installing the full version of INPA, which includes EDIABAS and BMW Standard Tools.

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