Hyundai Elantra: Button Engine Start System / Start/Stop Button Repair procedures

Removal

1.	Disconnect the negative(-) battery terminal.

2.	Remove the crash ped lower panel. (Refer to Body - "Crash Ped Lower Panel")

3.	Remove the start/stop button (B) after disconnect the connector (A).

Installation

1.	Install the start/stop button.

2.	Install the crash pad lower panel.

3.	Connect the negative (-) battery terminal.

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Hyundai Elantra AD (2016-2020) Service Manual: Variable Intake Solenoid(VIS) Actuator Repair procedures
Removal and Installation 1. Disconnect the vacuum hose (A). 2. Remove the variable Intake solenoid (VIS) actuator connector (B) and actuator (C). Tightening torque : 9.8 ~ 11.8N.m (1.0 ~ 1.2kgf.m, 7.2 ~ 8.7lb-ft) 3. Install in the reverse order of removal. ...

Hyundai Elantra AD (2016-2020) Service Manual: Underdrive Brake Control Solenoid Valve(UD/B_VFS) Description and Operation
Description • Underdrive brake control solenoid valve(UD/B) is attached to the valve body. • This variable force solenoid valve directly controls the hydraulic pressure inside the underdrive brake. ...