B1464

Code

Other B — Body

Seat Belt Switch Circuit Short To Battery

Brand: Other

Type: B — Body

Views: UK: 20 EN: 29 RU: 20

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Causes

Shorted wiring or pin to battery voltage (B+) on the seat belt switch circuit
Failed or internally shorted seat belt buckle/switch
Corroded or damaged connector, terminal, or harness insulation
Aftermarket seats/heated seats or recent seat work with damaged wiring
Water intrusion in connector or seat area
Faulty control module (less common)

Symptoms

Seat belt reminder lamp or chime may behave incorrectly (always indicate buckled or unbuckled)
Airbag/SRS or restraint system warning light illuminated
Related diagnostic trouble indicators set in vehicle body/control modules
Possible loss of occupant classification or seatbelt-specific interlocks

What to check

Read and record freeze frame and stored DTCs with a scan tool; confirm B1464 is current
Visually inspect seat, seat track area, and wiring harness for damage, chafe, or pinched wires
Inspect and unplug seat belt switch connector(s); check for corrosion, bent pins or moisture
Backprobe the switch harness and measure voltage with key ON (do not operate airbag circuits while powering connectors exposed)
Wiggle test harness/connector while monitoring live data or voltages to replicate fault
Compare readings to the same circuit on the opposite seat (if applicable)

Signal parameters

Expected: signal line normally toggles between near 0 V and battery voltage depending on switch position and vehicle design
With a short-to-battery fault: measured permanent ~12 V (B+) on signal line regardless of buckle position
Switch resistance: closed = near 0 Ω to ground (if switch is grounded when buckled) or near 0 Ω to B+ depending on design; open = high resistance
Refer to vehicle wiring diagram for exact expected voltages and switch polarity before measuring

Diagnostic algorithm

Confirm DTC B1464 is present and note whether it is current or history. Scan for related B1xxx codes and freeze-frame data.
Perform a visual inspection of seat area wiring, connectors, and switches for damage, corrosion, DMV or aftermarket modifications.
With ignition ON (engine off), backprobe the seat belt switch signal wire at the connector. Observe voltage while operating the buckle. If the signal remains ~12 V regardless of buckle position, suspect a short to battery.
Unplug the switch connector. Measure voltage at the harness side (module side). If harness still shows ~12 V, the wiring is shorted to B+ upstream — trace harness toward fuse/relay/battery to find contact point.
Disconnect any nearby 12 V sources (heated seat, power seat motors) and re-check to isolate if an accessory feed is contacting the signal wire.
Check continuity between signal wire and battery positive with circuit isolated; do not check continuity with live battery connected. Repair any chafed wire, connector, or splices found.
If harness measures normally when connector unplugged but switch shows 12 V when connected, replace the seat belt buckle/switch assembly and retest.
After repairs, clear codes, perform functional test of buckle input with scan tool, and verify DTC does not return. Re-inspect after road test/use cycles if intermittent.
If wiring and switch check good but DTC remains, consult wiring diagrams and consider control module input fault — verify with manufacturer diagnostics before replacing module.