This service manual for the 2021 Hyundai Elantra (CN7) is your go-to resource for everything you need to maintain, service, and repair your Elantra with precision. Covering all major systems — engine and fuel systems, transmission, suspension, brakes, electrical and electronic systems, body and interior elements — the manual delivers detailed diagnosis instructions, assembly/disassembly procedures, maintenance schedules and technical specifications. Whether you are doing routine maintenance or deeper system checks, the step-by-step guides and technical data ensure that work is done correctly and safely.
By following the guidelines in the manual, owners and mechanics can preserve the performance, safety, and longevity of the vehicle. Regular maintenance as described — checking fluids, inspection of brake, steering, suspension and emissions systems, tire condition, and electrical components — helps prevent wear and avoid unexpected breakdowns. Proper documentation of services also helps maintain warranty coverage and ensures reliability over time.

The emission control system of your vehicle is covered by a written limited warranty. Please see the warranty information contained in the Owner’s Handbook & Warranty Information booklet in your vehicle.
Repair procedures RemovalMood lamp unit1.Disconnect the negative (-) battery terminal.2.Remove the main crash pad assembly.(Refer to Body - "Main Crash Pad Assembly")3.Loosen the mounting screws and remove the main crash pad air duct (A).4.Loosen the mounting screws and remove the mood lamp unit (A).
Inspection1.Check for resistance between terminals in each switch position (LH).[LH : Audio + Hands free] Switch Resistance (±5%) SEEK Up430 ΩSEEK Down1.11 kΩMODE2.11 kΩMUTE3.11 kΩVolume (+)4.