The LATCH system holds a child restraint during driving and in an accident. This system is designed to make installation of the child restraint easier and reduce the possibility of improperly installing your child restraint. The LATCH system uses anchors in the vehicle and attachments on the child restraint. The LATCH system eliminates the need to use seat belts to secure the child restraint to the rear seats.
Lower anchors are metal bars built into the vehicle. There are two lower anchors for each LATCH seating position that will accommodate a child restraint with lower attachments.
To use the LATCH system in your vehicle, you must have a child restraint with LATCH attachments.
The child seat manufacturer will provide you with instructions on how to use the child seat with its attachments for the LATCH lower anchors.

LATCH anchors have been provided in the left and right outboard rear seating positions.
Their locations are shown in the illustration. There are no LATCH anchors provided for the center rear seating position.
WARNING
Do not attempt to install a child restraint system using LATCH anchors in the rear center seating position. There are no LATCH anchors provided for this seat. Using the outboard seat anchors can damage the anchors which may break or fail in a collision resulting in serious injury or death.

The lower anchor position indicator symbols are located on the left and right rear seat backs to identify the position of the lower anchors in your vehicle (see arrows in illustration).
The LATCH anchors are located between the seatback and the seat cushion of the rear seat left and right outboard seating positions.
Installing a Child Restraint System (CRS)
Securing a child restraint with the LATCH anchors systemHyundai Elantra AD (2016-2020) Service Manual: Input Speed Sensor Repair procedures
Inspection
1.
Using the GDS, check the input/output speed sensor waveforms.
A.
Turn OFF the ignition switch.
B.
Connect the GDS to the Data Link Connector(DLC) on the lower crash pad.
C.
Ignition "ON" & Engine "ON".
D.
Check the input/output speed sensor waveforms at high spe ...
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Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the heater and blower assembly.
(Refer to Heater - "Heater Unit")
3.
Remove the heater unit lower case (A) after loosening the mounting screws.
4.
Pull out the evaporator core (A) from the heater unit.
5.
T ...