A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
Possible causes
- The sensor connector or wiring behind the front bumper: water, dirt, damage after an impact
- The impact sensor itself (often replaced after an impact)
- The SRS unit (less often)
What you can do yourself
- You can drive, but don’t put off the repair: the airbags may not deploy in a crash.
- Don’t test squibs or airbags with a multimeter and don’t take them apart: the airbag can deploy and injure you. Touch the connectors only with the battery terminal disconnected and after waiting several minutes. Don’t fit airbag “emulators”: there will be no protection in a crash.
- If there was even a minor accident or the bumper, door or pillar was repaired, check that the sensor is connected.
- After the repair the code won’t go away by itself: it is cleared with a scan tool.
OOleg’s tip: check the connector
Often the cause is simple — there is no contact in the connector (plug). Look at the connector from the back: remove the rubber seal and you will see whether a wire is corroded or has come off completely. Corrosion shows up as green deposits. Ideally, gently pull each wire towards you one at a time: a sound wire stays in place, while a corroded one simply comes off — it needs to be repaired.
Unplug and inspect connectors with the ignition off.
This is the Toyota and Lexus meaning. On other makes this number means something else: if your car isn’t a Toyota or Lexus, change the make at the top.
Source: Toyota T-SB-0035-13 (static.nhtsa.gov)
The explanation comes from the error code reference in the AvtoElektrik PRO app.