The windshield washer is one of the elements responsible for road safety. When it fails, visibility deteriorates, especially in rainy or snowy weather. Let's go through the steps of how to check the windshield washer pump, including the example of the VAZ 2109, and also answer the question, how often should glow plugs be changed on a diesel — these two topics often concern drivers at the same time.

What the washer pump consists of

Inside the washer reservoir, a compact electric motor with an impeller is installed. When voltage is applied to it, it pumps fluid through the tubes to the nozzles. If the wipers work but the stream does not flow, possible causes:
  • the fuse has blown;
  • the contacts have oxidized;
  • the motor itself has stopped working;
  • the hoses or nozzles are clogged.

Ways to check the washer pump

1. Inspection

  • Make sure the reservoir is filled with fluid.
  • Inspect the hoses and their connection points.

2. Listening

  • Activate the washer. If a hum is heard but water does not flow, there is likely a clog in the hoses or nozzles.
  • If there is no sound, it is worth checking the electrical part.

3. Checking with a multimeter

For accurate diagnostics, you will need a multimeter:
  1. Disconnect the power connector from the pump.
  2. Set the steering column switch to the washer mode.
  3. Measure the voltage at the connector — it should be about 12 V.
    • If voltage is present, the pump itself is faulty.
    • If it is absent, look for the problem in the wiring or fuses.

4. Direct connection

  • Remove the pump from the reservoir.
  • Apply 12 V directly from the battery to it.
  • If the motor does not rotate, the part must be replaced.

Checking the washer pump on the VAZ 2109

On the VAZ 2109, the pump is installed in the reservoir under the hood. The procedure:
  1. Remove the reservoir or provide access to it from above.
  2. Disconnect the power connector and check the voltage with a multimeter when switched on.
  3. If there is power but the pump is silent, remove it and check it by direct connection to the battery.
  4. If the pump is working, look for a clog in the hoses or nozzles.

Service life and replacement intervals for glow plugs on a diesel

In addition to the question about the washer pump, many drivers are interested in: how often should glow plugs be changed on a diesel?
  • On average, such plugs last 80–100 thousand km, although the service life greatly depends on fuel quality and engine condition.
  • It is worth checking their performance every 50–60 thousand km.
  • If the starter takes longer to start, the engine is hard to start in frost, or an error appears on the dashboard, it may be time to replace the plugs.

How often should glow plugs be changed on a diesel?

  • Usually, once every 100 thousand km or earlier if signs of malfunction appear.
  • Sometimes individual plugs fail earlier, so it is important to check each one separately.

Summary

Now it is clear how to check the washer pump, including on the VAZ 2109 and other models. For diagnostics, a multimeter and a few minutes of time are enough. If voltage is present but the motor does not spin, the pump is replaced. As for glow plugs on a diesel — how often to change, the answer here is simple: on average, once every 80–100 thousand km, but earlier at the first signs of problems.