B1806

Symptoms

• The airbag malfunction lamp on the instrument panel comes on
• Passenger airbag does not deploy when testing diagnostic equipment
• Visible damage to wiring in the interior area under the passenger seat
• The error persists after turning the ignition on and off
• The SRS system is completely disabled or is unstable

Causes

• Oxidation or corrosion of squib connector contacts
• Broken or damaged wire in the SRS wiring harness
• Incorrect reconnection of the connector after removing the passenger seat
• Malfunction of the squib itself (internal break)
• Problems with the SRS control module (airbag control unit)
• Damage to the wiring harness due to moisture or mechanical impact
• Incorrect installation of the airbag after replacement
• Low voltage in the system power supply circuit

How to Fix

1. Connect the OBD-II scanner to the diagnostic connector and clear the error code B1806
2. Disconnect the battery, wait until the SRS capacitors are completely discharged (at least 15 minutes)
3. Visually inspect the wiring harness and connectors in the front passenger seat area for damage.
4. Disconnect the squib connector and check the contacts for oxidation or corrosion.
5. Clean the connector contacts using a special brush or fine-grit sandpaper
6. Measure the resistance of the squib circuit using a multimeter (usually 2-3 Ohms)
7. If necessary, replace the damaged wire or wiring harness
8. Reconnect the connector and make sure the connection is tight
9. Connect the battery and use a scanner to check if the code disappears
10. If you save the code, replace the squib itself with the original component
11. After repair, perform a full diagnostic of the SRS system

Related codes

FAQ