B1998 Code: Meaning, Symptoms, Causes & Fix

Overview

Code B1998 indicates a fault in Passenger Sid, Side mount Airbag Circuit Open, typically within safety restraint and occupant protection.

Symptoms

airbag/SRS warning lamp
restraint system fault stored
safety system disabled message

Common causes

Open circuit in wiring affecting passenger sid, side mount airbag circuit open
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose B1998

Confirm B1998 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to passenger sid, side mount airbag circuit open for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code B1998

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with B1998?

Most vehicles can be driven short-term with B1998, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the passenger sid, side mount airbag circuit open circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify B1998 remains cleared under the conditions that originally set the code.

Fix options

Repair open circuit and secure connector lock.
Clear corrosion and protect terminals.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$250-$1300

Common mistakes when diagnosing B1998

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

B1998 in common vehicles

B1998 appears across makes such as Mazda, Subaru, Lexus, Jeep. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes B1998?

B1998 is commonly set by open faults affecting passenger sid, side mount airbag circuit open.

How much does it cost to fix B1998?

For B1998, repair costs are typically $250-$1300 depending on exact root cause, labor rates, and part quality.

Can I clear B1998 without repair?

You can clear B1998 temporarily, but the code usually returns until the underlying fault is corrected.