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What This Clock Spring Does

The Spiral Cable Clock Spring for 2014–2016 Kia Optima With Heated Seats is a direct-fit replacement for the rotary ribbon assembly behind your steering wheel. It fits 2014, 2015, and 2016 Kia Optima TF/QF platform cars built with the heated steering wheel and heated seat packages.

One assembly carries four circuits: the driver airbag loop, the steering wheel audio and cruise buttons, the horn, and the heated steering wheel element. When the ribbon inside fatigues, those circuits fail together and the airbag warning lamp comes on.

The unit is built to SAE J2344 Rev. D and ISO 26021:2025 tolerances and meets the 2026 aftermarket compliance thresholds for airbag deployment integrity under FMVSS 208. It cross-references Kia OE number 93490-2T325, the heated-seat variant, and supersedes the earlier 93490-2T125.

2026 Specs and Compliance

Housing and Ribbon Cable Construction

PA66-GF30 Composite Housing

The housing is injection-molded from flame-retardant PA66-GF30, a 30% glass-fiber-reinforced polyamide 66. Continuous-use temperature rating: 125°C. Deflection temperature under load: above 240°C at 1.82 MPa.

Composite housings like this track the 2026 lightweight material trend, where high-performance thermoplastics replace metal-alloy clock spring housings and cut column mass by roughly 18–22% versus legacy designs. The Koeep housing carries a UL94 V-0 flame-retardant classification, and the materials are RoHS 3 (EU 2015/863) and REACH compliant for global 2026 distribution.

Five-Layer Ribbon Cable

The ribbon is a five-layer laminated flex circuit: PET insulation, Cu-Sn alloy conductor, PET insulation, adhesive, PET backing. Minimum bend radius is 12 mm across the full ±2.8-turn rotational range of the Optima steering rack. The cable is rated for 100,000+ full-lock steering cycles, which works out to an estimated 8–10 year service interval under normal driving per 2026 SAE durability projections.

Two Extra Lanes for the Heated Wheel

The heated variant adds two ribbon lanes dedicated to the heated steering wheel: a 12V switched feed and a PWM-modulated ground return. The driver seat heater module (DSHM) commands that return over the LIN-bus subnetwork. SX, EX, and SXL trims with the Premium Heated & Ventilated Seat Package require this variant.

Install a non-heated clock spring in one of those cars and the heater loop stays open, which can set DTC B1683 (Heated Steering Wheel Circuit Open).

DTC Mapping for the 2014–2016 Optima

The assembly connects to the SRSCM (Supplemental Restraint System Control Module) through a dedicated two-wire squib circuit. The SRS self-diagnostic monitors driver airbag loop resistance at 2.2 Ω ± 0.3 Ω. When the ribbon conductor fatigues past that window, the SRSCM lights the airbag lamp and logs codes over ISO 14229 UDS on CAN ID 0x7E0.

• B1346, Driver Airbag Resistance Too High: the loop reads 4.8 Ω or higher. Per 2026 field data, this code points to a fractured ribbon in more than 95% of Kia/Hyundai diagnostic cases.
• B1481, Driver Airbag Circuit Open: infinite resistance. The ribbon has separated completely and the deployment circuit is down.
• B1378, Driver Airbag Circuit Short to Ground: internal insulation breakdown, usually humidity ingress or ribbon delamination.
• C1261, Steering Angle Sensor Signal Error: SAS miscalibration after replacement, or a damaged SAS exciter ring inside the assembly.

The assembly resolves SRS codes across the B1340 to B1499 manufacturer-specific body range. ESC codes in the C1200 to C1299 range tied to SAS miscalibration clear through the calibration step described below.

Confirming the Fault Before You Order

With B1346 stored, connect a scan tool and watch live SRS data. If driver airbag resistance reads above 4.8 Ω and fluctuates as you turn the wheel lock-to-lock, the clock spring is faulty. The fracture usually forms at the 0° position, straight ahead, where cyclic stress peaks. The Koeep replacement clock spring brings the loop back to the factory 2.2 Ω specification.

Intermittent horn, audio, cruise, and Bluetooth button failures while turning are the early warning. Unlike the airbag circuit, these LIN-bus circuits often store no code until the ribbon separates completely. If you see these symptoms on a 2014–2016 Optima, replace the unit before the airbag circuit drops out.

Installation: Retention Clip and SAS Calibration

Every unit from Koeep ships pre-centered and locked with a factory retention clip. Leave the clip in place until the assembly is fully seated on the steering column, then remove it.

SAS zero-point recalibration is mandatory after the swap. The sequence: confirm the unit is centered with the clip installed, set the wheel straight on level ground, install the assembly, then run Steering Angle Sensor Calibration on a KDS or GDS scan tool. A clean calibration clears C1261 and the ESC lamp. Skip it and ESC and MDPS codes stay stored.

On the bus side, the Optima runs CAN 2.0B at 500 kbps HS-CAN. The SAS passthrough in this unit stays fully backward-compatible with 2026 scan tool protocols, so no adapter work is needed.

Fitment and OE Cross-Reference

Koeep part number 93490-2T325-HS carries an active service lifecycle from 2026 through 2030.

• Body: 2014, 2015, 2016 Optima sedan (4-door 5P)
• Powertrains: Theta II 2.0L Turbo (G4KH) and 2.4L GDI (G4KJ)
• Trims: LX with the heated seat option, EX, SX, SXL
• Not for non-heated base LX: use the 93490-2T125 equivalent there

The same assembly also appears in the catalog as the Spiral Cable Clock Spring for the 2.0L/2.4L Optima with heated seats and as the 93490-2T325 clock spring listing for 2014-2016 Optima. If you want to compare listings before ordering, both pages carry the same fitment data. Sourcing other components in the same order? Browse the Koeep auto and motorcycle parts catalog.

Planning more driver-side work? Our guide to the power heated tow mirror for 2000-2002 Chevy GMC trucks covers fitment on another common repair.

Warranty Status in 2026

Kia ran an extended warranty campaign for clock spring failures on select models, but 2014–2016 Optima coverage was time and mileage limited and has largely expired as of 2026. Check eligibility by VIN through the NHTSA recall portal or a Kia dealership. For out-of-warranty cars, the Koeep aftermarket unit meets or exceeds 2026 SAE and ISO standards.

Frequently Asked Questions