Hyundai Elantra: Body Electrical System / Rear Glass Defogger

Hyundai Elantra AD (2016-2020) Service Manual / Body Electrical System / Rear Glass Defogger

Components and Components Location

Component Location

1. Body control module (BCM)
2. Rear glass defogger switch

3. Rear glass defogger

Rear Glass Defogger Printed Heater Repair procedures

Inspection

•	Wrap tin foil around the end of the voltmeter test lead to prevent damaging the heater line. Apply finger pressure on the tin foil, moving the tin foil along the grid line to check for open circuits.

1.	Turn on the defogger switch and use a voltmeter to measure the voltage of each heater line at the glass center point. If a voltage of approximately 6V is indicated by the voltmeter, the heater line of the rear window is considered satisfactory.

2.	If a heater line is burned out between the center point and (+) terminal, the voltmeter will indicate 12V.

3.	If a heater line is burned out between the center point and (-) terminal, the voltmeter will indicate 0V.

4.	To check for open circuits, slowly move the test lead in the direction that the open circuit seems to exist. Try to find a point where a voltage is generated or changes to 0V. The point where the voltage has changed is the open-circuit point.

Use an ohmmeter to measure the resistance of each heater line between a terminal and the center of a grid line, and between the same terminal and the center of one adjacent heater line. The section with a broken heater line will have a resistance twice that in other sections. In the affected section, move the test lead to a position where the resistance sharply changes.

Repair Of Broken Heater Line

Prepare the following items :

1.	Conductive paint.

2.	Paint thinner.

3.	Masking tape.

4.	Silicone remover.

Using a thin brush :

Wipe the glass adjacent to the broken heater line, clean with silicone remover and attach the masking tape as shown. Shake the conductive paint container well, and apply three coats with a brush at intervals of about 15 minutes apart. Remove the tape and allow sufficient time for drying before applying power. For a better finish, scrape away excess deposits with a knife after the paint has completely dried. (Allow 24 hours).

Rear Glass Defogger Switch Repair procedures

Inspection

The body electrocal system can be quickly diagnosed failed parts with vehicle diagnostic system(GDS).

The diagnostic system(GDS) provides the following information.

(1)	Self diagnosis : Checking the failure code (DTC) and display

(2)	Current data : Checking the system input/output data state

(3)	Actuation test : Checking the system operation condition

(4)	Additional function : Other controlling such as he system option and zero point

2.	Select the "Car Model" and the system to be checked in order to check the vehicle with the tester.

3.	Select the "Smart Junction Box (SJB)" to check the windshield deicer.

4.	Select the "Current Date" menu to search the current state of the input/output data. The input/output data for the sensors corresponding to the "Smart Junction Box(SJB)" can be checked.

5.	Select "Actuation Test", if you want to check the Smart Junction Box (SJB) data operation forcefully.

Removal

1.	Disconnect the negative (-) battery terminal.

2.	Remove the heater and A/C controll unit. (Refer to Heating, Ventilation, Air conditioning - "Heater & A/C Control Unit (Dual)")

Installation

1.	Install the heater and A/C control unit.

2.	Connect the negative (-) battery terminal.

Other information:

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