| Description | 

| 1. | 
 General description 
WU is a sensor placed in the tire that reports pressure and temperature. 
The WU is mounted inside the wheels, fixed to the valve. The angle between the valve and the housing of the WU is variable. 
This allows adaptation to various types of rims. 
The Wheel Unit is made of a PCB supporting the electronic 
hardware and encapsulated inside a housing which is potted with 
polyurethane. 
It is self-powered by a battery and includes all systems for 
parameter measurement (pressure, temperature and centrifugal 
acceleration and optionally rotation direction), RF transmission and LF 
detection. 
To achieve the specified battery lifetime, the WU supports 
various measurement and transmission timings, depending on WU operation 
mode. 
For RF transmission, WU uses an internal antenna.  | 
| 2. | 
 First Block Mode 
: When vehicle start driving, Sensor enter Mode First Block. 
 Typical period of RF emissions is 16 sec. for 40 times for Auto-learning and Auto-location function.  | 
| 3. | 
 Driving Mode 
: After 19 min. parking and then finishing Mode First Block mode, WU enter Driving mode. 
Typical period of RF emissions are 64 sec above 4g vehicle speed.  | 
| 4. | 
 Parking Mode 
: at below 3g Vehicle speed, enter Parking mode. 
 Typical periodicities of RF emissions are 13 hours.  | 
Description and Operation
TPMS Sensor Repair proceduresHyundai Elantra AD (2016-2020) Owners Manual: SRS Care
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by yourself. If the SRS air bag warning light does not illuminate when the ignition 
switch is in the ON position, or continuously remains on, have your vehicle immediately 
inspected by an authorized HYUNDAI deal ...
   
Hyundai Elantra AD (2016-2020) Service Manual: Alternator Repair procedures
   Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable. 
2.
 Remove the drive belt. 
(Refer to Engine Mechanical System - "Drive Belt") 
3.
Disconnect the alternator connector (A) and the cable (B) from alternator "B" terminal.
4.
 Remove the alternator (B ...