B1806 Toyota Avalon – Open in Front Passenger Side Squib Circuit

Toyota logoToyota-specific code — factory diagnostic data
DTC Data Sheet
CodeB1806
Vehicle2014 Toyota Avalon (XX40)
SystemAirbag System
Fault typeCircuit Open
Official meaningOpen in Front Passenger Side Squib Circuit
Source2014 Toyota Avalon factory diagnostic information

Definition source: Toyota factory description. Diagnostic guidance is based on factory-defined fault logic for this code.

B1806 on the 2014 Toyota Avalon means: Open in Front Passenger Side Squib Circuit. It is a circuit open code reported by the Airbag System.

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⚠ Scan tool requirement: This is a Toyota-specific code. A generic OBD2 reader will retrieve the code but cannot access the module-level data, live PIDs, or bi-directional tests needed for diagnosis. A professional-grade scan tool with Toyota coverage is required for complete diagnosis.
⚠ SRS Safety Warning: The Supplemental Restraint System (SRS) contains explosive devices. Incorrect diagnosis or handling can cause accidental airbag deployment or system failure. Always disable the SRS before working on related circuits. This repair should be performed by a qualified technician with SRS-certified training and equipment.

B1806 Quick Answer

B1806 on a 2014 Toyota Avalon indicates Open in Front Passenger Side Squib Circuit. Start with a freeze-frame check and a careful inspection of the connector and wiring at the affected device before replacing any parts.

What Does B1806 Mean on a Toyota Avalon?

On the 2014 Toyota Avalon, the Airbag System sets B1806 when it detects a fault matching its official definition: Open in Front Passenger Side Squib Circuit. This is a manufacturer-specific definition from Toyota factory diagnostic data and applies to the XX40-generation Avalon.

Symptoms

  • Warning light for the affected system (check engine, ABS, airbag, or a system indicator depending on the module)
  • Reduced or lost function of the airbag system
  • Possible related codes from other modules on the Avalon CAN/LIN network

Common Causes

  • Fault in the component named in the definition (open in front passenger side squib circuit)
  • Open, shorted, or high-resistance wiring in the affected circuit
  • Connector corrosion, water ingress, or a backed-out terminal
  • Loss of supply voltage or a poor ground at the device
  • Module internal fault — confirm wiring and supplies before condemning the module

Diagnostic Approach

For B1806 on the 2014 Toyota Avalon you’ll want a scan tool with Toyota-enhanced coverage (Techstream-class) — generic OBD-II readers usually will not read B-codes — plus a digital multimeter and the wiring diagram.

  • Confirm the code is current, not stored history, and record freeze-frame data.
  • Read all modules — related codes often pinpoint the root cause faster than the headline code.
  • Inspect and wiggle-test the connector at the named device while watching live data.
  • Measure supply voltage and ground integrity at the device; verify the circuit against the Avalon wiring diagram.
  • Substitute or isolate the suspect device only after wiring and supplies check out.
  • Clear the code and road-test through one or two drive cycles to confirm the repair.

Possible Fixes

  • Repair open/short/high-resistance wiring or a corroded connector
  • Restore supply voltage or ground at the affected device
  • Replace the failed component named in the definition
  • Replace and, where required, initialise/program the module if it is internally faulty

Can I Still Drive With B1806?

It depends on the system. Airbag System faults that affect braking, the airbag/restraint system, power steering, or stability control should be repaired before further driving. Comfort or convenience faults can usually be deferred briefly, but related codes can mask one another on the Avalon network — diagnose promptly.

Compare nearby Toyota side squib trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • B2321 – Toyota Avalon – Driver Side Door ECU Communication Stop
  • B2322 – Toyota Avalon – Front Passenger Side Door ECU Communication Stop
  • C1242 – Toyota Avalon – Open in IG1 / IG2 Power Source Circuit
  • B1570 – Toyota Avalon – Manual (SOS) Switch Red Indicator Malfunction
  • B1206 – Toyota Avalon – P/W Master Switch Communication Stop
  • B1571 – Toyota Avalon – Manual (SOS) Switch Green Indicator Malfunction

FAQ

Is B1806 specific to the Toyota Avalon?

The definition here is taken from 2014 Toyota Avalon (XX40) factory diagnostic data. The same code may appear on other Toyota models, but the affected module and exact criteria can differ between platforms.

Can I clear B1806 without fixing it?

You can clear it, but if the underlying fault is still present the Avalon will reset the code on the next drive cycle that runs the relevant monitor. Diagnose the cause first.

Will a generic OBD-II reader show B1806?

Often not — B-codes are manufacturer-specific and usually require a scan tool with Toyota-enhanced coverage such as a Techstream-class tool.

Source

Code definition from 2014 Toyota Avalon (XX40) factory diagnostic information (Airbag System). Symptom, cause, and diagnosis guidance summarised from standard OBD-II diagnostic practice for this platform.