Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSHYUNDAI1994SONATA GLS, 2.0 F, STANDARDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSDEFOGGER - REAR WINDOWSYSTEM TESTING
1994 Hyundai Sonata GLS, 2.0 F, Standard
System Testing
1994 Hyundai Sonata GLS, 2.0 F, StandardSECTION System Testing
- Check fuse panel fuse No. 7 (20-amp). Turn ignition on. Push defogger control switch to ON position. Use a voltmeter or test light to check battery voltage at rear window grid feed wire connector.
- If battery voltage does not exist at grid connector and indicator light is on, there is an open circuit between grid connector and defogger relay. Defogger relay is located in trunk, behind right side panel.NOTE: Sonata ETACS module uses 2 14-pin connectors (M24-1 and M24-2). Use wire colors given in test procedure to identify connector terminals. See WIRING DIAGRAM .
- If battery voltage does not exist at grid connector and indicator light is NOT on, check defogger relay connector terminal No. 2 for input voltage from fuse. SeeFig 1 . If voltage does not exist, repair open in circuit. If voltage does exist, use a test light to backprobe ETACS module 14-pin connector (M24-2) terminal No. 11 (Red/Black wire, defogger switch terminal) to ground. SeeFig 1 . ETACS module is located behind left, lower instrument panel, on left side of steering column.
- Using voltmeter, check rear window grid connector voltage. If voltage exists, replace control switch. If voltage does not exist at grid connector, use a voltmeter to check voltage at the ETACS module 14-pin connector (M24-2) terminal No. 3 (Green/Black wire). SeeFig 1 . If voltage does not exist, replace ETACS module. If voltage does exist, replace defogger relay.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.