B1378 – Front driver side airbag (DSAB) resistance too high (Kia)

Kia-specific code — factory diagnostic data

B1378 means the airbag system has detected a problem that can disable the front driver airbag on your Kia EV6. In plain terms, the SRS warning light comes on and the vehicle may not protect you as designed in a crash. According to Kia factory diagnostic data, this code indicates the front driver side airbag (DSAB) circuit shows resistance that is too high. High resistance usually comes from a poor connection, damaged wiring, or a fault in the airbag module path. Treat this as safety-critical and follow Kia SRS depowering procedures before touching any connectors.

🔍Decode any Kia EV6 VIN — free recalls, specs & safety ratings — free VIN decoder with NHTSA data

B1378 Quick Answer

B1378 on a Kia EV6 points to excessive resistance in the front driver side airbag (DSAB) circuit. Diagnose the connectors and wiring first, using OEM-approved SRS test methods, before replacing any parts.

What Does B1378 Mean?

Official definition (Kia): “Front driver side airbag (DSAB) resistance too high.” The AB (Airbag) module set this code because it sees too much resistance in the driver front airbag circuit. In practice, the SRS warning lamp stays on and the driver airbag may not deploy as intended.

What the module is checking: The AB module continuously monitors the DSAB firing circuit integrity. It looks for a resistance value outside its acceptable window. Why that matters: “Resistance too high” usually points to an open circuit or added resistance, not a guaranteed bad airbag. You must confirm the circuit condition at the correct connectors using Kia-approved procedures, since improper testing can deploy an airbag or damage the module.

Theory of Operation

Under normal conditions, the Kia EV6 AB (Airbag) module monitors each airbag igniter circuit for continuity. The module uses a low-energy diagnostic signal to verify the circuit stays within a normal resistance range. The module also checks for shorts to power or ground, depending on circuit design.

B1378 sets when the module interprets the DSAB circuit as “too high” resistance. That typically happens when the circuit goes partially open. Loose terminals, connector fretting, corrosion, or a damaged clock spring path can add resistance. Any added resistance changes the expected circuit signature, so the AB module commands the warning lamp and stores the fault to prevent unsafe deployment logic.

Symptoms

You will usually notice at least one of these symptoms when B1378 sets on a Kia EV6:

• SRS warning light illuminated on the instrument cluster
• Airbag status message or warning indicator present, depending on cluster configuration
• Stored DTC B1378 in the AB (Airbag) module memory
• No airbag readiness system fails its self-check and stays in a faulted state
• Intermittent warning light that changes with steering wheel position or driver seat movement
• Related codes additional SRS circuit DTCs may appear if the fault affects shared routing
• Post-service onset warning appears after interior or steering column work near SRS connectors

Common Causes

• Loose DSAB connector fitment: A partially seated connector adds contact resistance and pushes the AB module’s measured loop resistance high.
• Connector terminal fretting or oxidation: Micro-movement and humidity create a thin insulating layer on terminals, which raises resistance under vibration.
• Harness damage in the driver-side airbag circuit: A stretched, pinched, or chafed harness can break conductor strands and increase resistance without an obvious open.
• Poor pin retention or spread terminals: Terminals that lost tension touch lightly, so the circuit reads high resistance even though it “looks connected.”
• Previous repair contamination or wrong terminals: Non-OEM terminals, solder, or incorrect crimp work can change impedance and trigger a circuit-high fault.
• High-resistance ground or power feed affecting AB module sensing: A weak supply or ground can distort the module’s resistance calculation and set a high-resistance code.
• Internal resistance change in the driver-side airbag module (DSAB): An aged or damaged inflator module can drift out of the expected resistance window and set B1378.
• Water intrusion at connectors or along the harness: Moisture introduces corrosion and electrolyte paths that quickly increase resistance and create intermittent faults.

Diagnosis Steps

Use a scan tool with full Kia SRS access, plus a DMM for power and ground voltage-drop checks. Follow Kia depowering procedures before touching any SRS connectors. Use only OEM-approved SRS test adapters and methods. Avoid back-probing with standard leads or using ohmmeters across airbag circuits. Plan to inspect connectors and harness routing closely on the Kia EV6.

1. Confirm B1378 in the AB (Airbag) module and record code status. Save freeze frame data, especially ignition state, system voltage, and any related SRS DTCs. Freeze frame shows the conditions when the fault set. Use a scan-tool snapshot later to capture intermittent events during a wiggle test or road test.
2. Perform a fast visual inspection before meter work. Check for recent steering wheel, column, or interior work that could disturb SRS connectors. Inspect visible harness routing and any accessible connectors for water tracks, damaged locks, or stress points. Depower the SRS per Kia procedures before disconnecting anything.
3. Check fuses and power distribution that feed the SRS/AB system. Verify fuse integrity and correct seating, not just continuity. Look for heat discoloration or loose fuse blades. A weak feed can skew module sensing and create false circuit-high symptoms.
4. Verify AB module power and ground with voltage-drop testing under load. Keep the circuit operating as designed during the test. Measure ground drop and confirm it stays under 0.1 V with load. Load-test the power feed side the same way. Do not rely on unloaded voltage or simple continuity.
5. With the SRS depowered, inspect the DSAB circuit connectors you can access without disassembling unsafe areas. Focus on connector lock engagement, secondary locks, terminal push-outs, and bent pins. Look for fretting debris, green corrosion, or moisture. Replace damaged terminals only with approved parts and methods.
6. Check harness integrity along the suspected DSAB circuit path using OEM-approved procedures. Inspect for pinch points, sharp bends, and rub-through areas that can increase resistance. Pay attention to areas that move or vibrate. Do not pierce insulation on SRS wiring.
7. Use the scan tool to review SRS data that supports a high-resistance diagnosis. Look for any available “resistance,” “circuit status,” or “squib/airbag loop” state indicators. Compare left/right or driver/passenger loop status only if the service information lists them as comparable. Do not assume values match across different circuits.
8. If service information allows, perform an approved substitute load/test adapter procedure at the harness side. This isolates the harness and module inputs from the DSAB unit. The goal is to see whether the AB module still reports high resistance with the airbag disconnected and the approved test device installed. Never measure airbag inflator resistance directly with a standard ohmmeter.
9. Run a controlled wiggle test while monitoring the scan tool status or snapshot. Move one harness segment at a time and avoid stressing connectors. If the status flips between normal and high resistance, you found an intermittent connection or conductor damage. Reinspect the exact segment that triggered the change.
10. After repairs, reassemble connectors with locks fully seated and routing restored. Repower the SRS per Kia procedure and run a full AB module self-check. Clear codes only after you complete repairs and confirm proper setup. Verify B1378 does not return on key-on and after a short validation drive, if safe and allowed.

Professional tip: Treat B1378 like a high-resistance connection first, not a failed airbag. Most proven fixes come from terminal tension, connector seating, and harness damage found during a targeted wiggle test. Use freeze frame to decide if it fails at key-on or only after driving. A fault that returns immediately on key-on points to a hard circuit issue.

Possible Fixes

• Restore connector engagement: Reseat the DSAB-related connectors, confirm secondary locks, and correct any pin push-outs found during inspection.
• Repair terminal tension or corrosion: Clean only where Kia procedures allow, then replace affected terminals or connector bodies using OEM-approved crimp tools and parts.
• Repair or replace damaged harness section: Correct chafing, broken strands, or pinch damage using approved SRS wiring repair methods and proper routing retention.
• Correct AB module power/ground issues: Repair high-resistance grounds, loose fasteners, or power feed faults confirmed by voltage-drop under load.
• Replace the driver-side airbag module only after circuit proof: Replace the DSAB unit only when approved isolation tests show the harness and AB module inputs operate correctly.
• Address water intrusion: Repair leak sources and replace any water-damaged connectors or terminals that create recurring high resistance.

Can I Still Drive With B1378?

You can usually drive a Kia EV6 with B1378, but you should treat the SRS system as compromised. This DTC comes from the AB (Airbag) module and points to high resistance in the front driver side airbag (DSAB) circuit. High resistance can prevent proper deployment, or it can disable part of the system. Do not unplug yellow SRS connectors, probe squib circuits, or move steering column wiring to “see if it changes.” Follow Kia depowering procedures before any inspection near SRS harnesses. Schedule diagnosis as soon as possible, and use a scan tool that can access Kia SRS data and code details.

How Serious Is This Code?

This code is serious from a safety standpoint, not a drivability standpoint. B1378 rarely causes stalling or reduced power. It often acts like an “inconvenience” because the vehicle drives normally. The real risk sits in a crash. The AB (Airbag) module logged a circuit high condition, which matches excessive resistance. That can disable the driver airbag circuit or change how the system manages deployment. Treat the SRS as potentially unable to protect you as designed. Proper diagnosis requires SRS-safe procedures, OEM-approved test methods, and technician training. Avoid DIY SRS circuit testing, since the wrong tools or steps can cause damage or injury.

Common Misdiagnoses

Technicians often replace the driver airbag module or clockspring too early. They chase the most expensive parts first. High resistance almost always comes from connection problems, harness damage, or terminal fit issues. Another frequent mistake involves using standard multimeter leads on SRS circuits. That can spread terminals or violate OEM test rules. Some techs also ignore Kia-specific SRS freeze frame and event data. They miss clues like an intermittent open during steering movement. Finally, many skip a connector inspection at the AB module. A small amount of fretting corrosion there can add enough resistance to trigger B1378.

Most Likely Fix

The most commonly confirmed repair path involves correcting resistance at a connection point, not replacing the AB (Airbag) module. Start with Kia-approved depowering and then inspect the DSAB circuit connectors and terminals for poor pin fit, fretting, or water intrusion. Pay close attention to the steering wheel side interface and any in-line SRS connectors. If inspection shows damage, repair the harness using OEM-approved SRS repair methods, then confirm with a full SRS scan and a proper post-repair self-test. Do not assume a clockspring or airbag needs replacement until you prove the circuit fault.

Repair Costs

SRS/airbag repair costs vary significantly by component. Diagnosis must be performed by a qualified technician with SRS-capable equipment. Do not attempt airbag system repairs without proper training and safety procedures.

Last updated: April 9, 2026

Definition source: Kia factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.