B1600 – Driver frontal airbag not connected (BYD)

B1600 means your 2020 BYD Dolphin has detected that the driver’s front airbag is not connected, which can leave the airbag system unable to protect you properly in a crash. For most owners, the real-world effect is an SRS/airbag warning light and a safety system that may be partially disabled until the fault is corrected. According to BYD factory diagnostic data, this is a BYD-defined code indicating “Driver frontal airbag not connected.” Because this is an SRS safety-critical concern, do not touch yellow SRS connectors or steering wheel airbag wiring without following BYD depowering procedures and OEM-approved test methods.

B1600 Quick Answer

On BYD vehicles, B1600 points to the driver frontal airbag circuit being seen as not connected by the SRS system; the airbag warning light will typically be on and the system may not deploy as intended.

What Does B1600 Mean?

B1600 means the car’s airbag control system believes the driver’s front airbag isn’t electrically connected. In technical terms, on BYD platforms this is a manufacturer-specific Body/SRS-related DTC set when the SRS controller detects an open circuit/not-present condition for the driver frontal airbag circuit (as defined by the scan-tool description), and it will command the SRS warning indicator and inhibit normal deployment logic for the affected stage(s) until the issue is resolved and verified.

Theory of Operation

On BYD vehicles, the SRS (airbag) control unit continuously monitors the driver frontal airbag circuit for electrical integrity. It does this by checking whether the circuit appears present and within an expected range so it can differentiate a properly connected airbag module from a disconnected connector or broken wiring. If the controller determines the driver frontal airbag is not connected, it stores B1600 and turns on the SRS warning lamp to alert the driver that protection may be reduced.

The driver frontal airbag circuit typically routes from the SRS control unit through the vehicle harness and a steering-column/steering-wheel connection path (often involving a rotating coupling/clock-spring type interface, depending on BYD platform design) to the airbag module in the steering wheel. Because SRS circuits are designed to be handled only with OEM-approved methods, diagnosis must begin with safe depowering and scan-tool confirmation, then careful inspection and continuity/connection verification using approved adapters—not standard multimeter probing into SRS terminals.

Symptoms

Common symptoms you may notice with B1600 on a BYD Dolphin include:

• SRS warning light illuminated on the instrument cluster
• Airbag system message warning displayed (wording varies by BYD software/cluster)
• DTC stored B1600 present in SRS/Body-related diagnostics
• Reduced protection driver frontal airbag may be disabled or deployment strategy altered
• Failed inspection vehicle may fail safety/roadworthiness checks due to SRS lamp
• Intermittent fault warning may come and go with steering wheel movement or temperature/vibration changes
• Related SRS codes additional driver airbag/steering wheel circuit codes may appear depending on what the SRS module detects

Common Causes

• Driver airbag module connector not fully seated: If the connector at the steering wheel airbag module is partially latched or misaligned, the SRS control unit can detect a “not connected” condition.
• Open circuit in the driver airbag squib circuit: A break in the wiring path between the SRS control unit and the driver frontal airbag inflator circuit will be interpreted by BYD as the airbag not connected.
• High resistance due to terminal fretting/corrosion: Oxidation or micro-movement at terminals (airbag side, clockspring side, or harness side) can raise resistance enough for the module’s plausibility checks to flag a connection fault.
• Damaged or worn clockspring (steering wheel spiral cable): Because the driver airbag circuit typically routes through the steering column clockspring, an internal open/intermittent can present as an airbag not connected, often changing with steering angle.
• Connector damage from improper probing or handling: Using standard meter leads, back-probing, or test lights on SRS connectors can spread terminals or damage shorting bars, creating a real connection fault afterward.
• Harness damage in the steering column/under-dash area: Pinched, chafed, stretched, or previously repaired wiring near moving column components can intermittently open the driver airbag circuit.
• Incorrect or incompatible airbag/steering wheel components installed: If parts were replaced with non-matching BYD-specific components or incorrectly assembled, the SRS control unit may not recognize the driver frontal airbag as properly connected.
• SRS control unit connector seating/pin fit issue: A loose connector, poor pin tension, or contamination at the SRS control unit harness interface can interrupt the driver airbag circuit continuity and set B1600.

Diagnosis Steps

Tools typically needed include a BYD-capable scan tool with full SRS access (DTCs, data list, and network scan), OEM-approved SRS test adapters/breakout leads, and a quality multimeter used only per BYD procedures. Follow SRS depowering and wait-time requirements before touching any yellow SRS connector. Do not use test lights or standard probes on airbag circuits.

1. Confirm DTC B1600 is present in the SRS/airbag system and record all stored/pending DTCs plus freeze frame/event data and timestamps; note whether the fault is current or history and whether it returns immediately after key-on self-check.
2. Before any measurements, perform a careful visual inspection of the driver frontal airbag circuit path: steering wheel airbag module area, clockspring/steering column harness routing, under-dash harness, and SRS control unit connector area; look for signs of prior repairs, pinched wiring, water intrusion, or disturbed connectors.
3. Check relevant fuses and power distribution feeding the SRS system (and any related ignition/backup supply circuits) using the vehicle’s fuse map; verify correct fuse fit and signs of overheating, and correct any power supply issue before testing at the control unit.
4. Verify SRS control unit power and ground integrity under load using OEM-approved methods (do not pierce insulation); confirm grounds are secure and free of corrosion and that power feeds remain stable during key-on and while gently moving harness sections.
5. Depower the SRS system following BYD procedures (ignition off, battery disconnected, required wait time observed); only after depowering, disconnect the steering wheel airbag connector(s) and inspect for bent pins, pushed-out terminals, damaged CPA/secondary locks, contamination, or evidence of improper probing.
6. Inspect the clockspring/spiral cable connections at both ends (steering wheel side and column harness side) for secure seating and terminal condition; if the fault is intermittent, correlate it to steering position by reviewing scan tool data/event history rather than manipulating the circuit energized.
7. Using only OEM-approved SRS test adapters and procedures, perform circuit integrity checks on the driver airbag squib circuit between the SRS control unit connector and the steering wheel side of the harness/clockspring; the goal is to identify an open circuit, poor pin fit, or abnormal resistance/continuity without directly measuring through an undeployed airbag module.
8. If the harness tests indicate an intermittent, conduct a controlled wiggle test on non-SRS portions of the harness routing (under-dash/column harness supports and connectors) while monitoring scan tool SRS status/data list for a driver airbag connection state change; do not wiggle the airbag connector with the system powered.
9. If a wiring/connector fault is found, repair or replace the affected harness/connector components using BYD-approved repair methods (correct terminals, crimping, seals, and locking features); ensure harness is resecured to prevent future chafing or tension from steering column movement.
10. After repairs, reassemble connectors with proper secondary locks engaged, restore SRS power following the correct sequence, then use the scan tool to clear DTCs only after the underlying fault is corrected; cycle ignition and confirm B1600 does not reset and the SRS warning lamp performs a normal self-check.
11. Perform a final validation: rescan for any additional SRS codes, confirm no related DTCs remain, and document findings/repairs; if B1600 persists with verified power/grounds and verified harness integrity, escalate to model-specific BYD service information for component-level isolation rather than replacing the SRS control unit first.

Professional tip: For a BYD “driver frontal airbag not connected” fault, prioritize connector seating, pin fit, and the clockspring path, but keep the system depowered whenever handling SRS connectors. Use only OEM-approved SRS test harnesses/adapters; direct probing or resistance testing across an airbag module connector with standard leads can damage terminals or violate safe testing practices, creating new faults and safety risks.

Possible Fixes

• Reseat and correctly lock the driver airbag connector(s): Ensure the connector is fully engaged with secondary locks/CPA installed and terminals not pushed back.
• Repair/replace damaged clockspring (spiral cable) after confirmation: If testing indicates an internal open/intermittent correlated with steering movement, replace the clockspring and verify proper routing and centering.
• Repair harness damage in the driver airbag circuit: Correct opens/high resistance by repairing chafed/pinched wiring and restoring proper harness retention and strain relief.
• Replace damaged terminals/connectors using OEM-approved parts and methods: Address poor pin tension, corrosion, or prior probing damage by replacing terminals and ensuring correct sealing and locking features.
• Correct incorrect component fitment: If prior work installed incompatible steering wheel/airbag components or incorrect connectors, restore the correct BYD-matched parts and assembly.
• Service SRS control unit connector interface if faulty: Clean/repair connector seating or terminal fit issues at the SRS control unit only after power/ground and circuit-path checks confirm the issue is at that interface.

Can I Still Drive With B1600?

You may be able to drive a 2020 BYD Dolphin with DTC B1600 stored, but you should treat it as a safety-critical condition. On BYD vehicles, B1600 is defined as “Driver frontal airbag not connected,” which indicates the SRS (airbag) controller is not detecting the driver frontal airbag circuit as connected/valid. The vehicle will typically operate normally from a powertrain standpoint, but the restraint system may be disabled or partially disabled, and the airbag warning lamp will usually remain on. Do not attempt DIY checks at the steering wheel/airbag connectors. Follow BYD SRS depowering procedures and use only OEM-approved test methods; improper handling can risk accidental deployment or damage.

How Serious Is This Code?

This code is serious because it involves the driver frontal airbag circuit, not a convenience feature. While B1600 usually will not cause a drivability complaint (no stalling, no limp mode by itself), it can mean the SRS system is potentially compromised: the driver frontal airbag may not deploy when commanded, or the system may inhibit deployment due to an “open/not connected” detection. Because this is an SRS/squib-related fault, diagnosis should be performed only with SRS-certified equipment, correct BYD scan-tool access to the airbag/SRS module, and technician training. Repairs should not be attempted as a DIY task, and connectors must not be probed with standard leads or test lights.

Common Misdiagnoses

Common wasted-spend scenarios with BYD B1600 start with replacing the driver airbag module (or the SRS control unit) before confirming the “not connected” condition is actually in the airbag circuit and not caused by a connector, harness routing, or a poor terminal fit. Another frequent error is skipping SRS depowering and then “checking continuity” with non-approved tools, which can damage the circuit or create new faults. Technicians also misread freeze-frame/event data: if B1600 set during steering column service or interior work, the root cause is often an unplugged connector or connector lock not seated. Avoid guessing: confirm SRS module power/ground health, verify the scan tool can read SRS data and DTC status, and perform only OEM-approved resistance/line checks using the proper adapters.

Most Likely Fix

The most common repair directions for BYD B1600 align with the official definition: restore a proper electrical connection between the SRS controller and the driver frontal airbag circuit. In practice, that often means correcting a loose/unseated SRS connector, damaged terminals, or a harness issue in the steering wheel/steering column area (exact routing varies by BYD platform). Do not treat these as certain: the correct fix should be chosen only after confirming the fault is present (current vs history), verifying connector locks/terminal tension per BYD procedures, and validating the circuit with OEM-approved SRS test equipment—without replacing the SRS ECU as an initial step.

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: March 29, 2026