P05B9
Restraint Deployment Signal Circuit Low
P05B9 is an OBD-II diagnostic trouble code meaning: Restraint Deployment Signal Circuit Low. Common causes: signal wire shorted to ground, internal fault in the output stage of the srs module.
Symptoms
- SRS or airbag indicator is on
- The check engine light may also be on
- Possible violation of security algorithms
- Zero or very low voltage on signal wire
Causes
- Signal wire shorted to ground
- Internal fault in the output stage of the SRS module
- Damage to the insulation of the wire with contact to the body
- Moisture entering the signal circuit connector
- Receiving ECU malfunction (incorrect line load)
How to Fix
- ATTENTION: disconnect the battery, wait 10+ minutes before working with SRS
- Read codes from SRS module
- Disconnect the connector and measure the resistance of the signal wire to ground - when shorted it will be close to zero
- Find and eliminate the short circuit (inspect the wiring harness)
- Check the output signal of the SRS module after troubleshooting
- Work with SRS should only be carried out by an authorized service center
Related codes
Error P05B9 by Vehicle Brand
FAQ
What does the P05B9 code mean?
P05B9 is an OBD-II diagnostic trouble code that indicates: Restraint Deployment Signal Circuit Low
What causes a P05B9 error code?
The most common causes of P05B9 include: Signal wire shorted to ground; Internal fault in the output stage of the SRS module; Damage to the insulation of the wire with contact to the body; Moisture entering the signal circuit connector.
How do I fix a P05B9 diagnostic trouble code?
To fix P05B9: ATTENTION: disconnect the battery, wait 10+ minutes before working with SRS. Read codes from SRS module. Disconnect the connector and measure the resistance of the signal wire to ground - when shorted it will be close to zero. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P05B9?
Do not drive — repair immediately
See also: Russian version · NationStat