OBD-II Fault Code

B2345: Seat Switch Reference Voltage Negative Common Open Circuit

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2345.

System family

Body

Generic/SAE

Repair category

Power supply / charging

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What B2345 usually means

Seat Switch Reference Voltage Negative Common Open Circuit.

Common symptoms

Body/accessory warning lamp or feature not working

Likely causes

Weak battery; Charging system fault; Loose/corroded terminals; Poor ground; Open circuit; Disconnected connector; Broken wire; Failed component

Diagnostic checks

Check related fuses, connectors, grounds and switch/module power supply; Test battery state of charge and charging voltage; Inspect terminals and ground straps; Check connector fitment and continuity from module to component

Repair guidance

Clean/tighten terminals, replace weak battery, repair alternator/charging circuit as needed; Repair open wire/connector or replace the failed component after continuity test

Verification after repair

Operate the affected body/accessory system and rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary. A DTC identifies a circuit or system condition, not always the failed part.