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.
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HOMESERVICE MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSSECURITY SYSTEM - TROUBLESHOOTINGOVERVIEW
1991 Hyundai Sonata V6-3.0L
Security System - Troubleshooting: Overview
1991 Hyundai Sonata V6-3.0LSECTION Overview
91hyundai02
Group: Electrical
Number: 019
Date: June, 1991
Model: 1991 Sonata
Subject
1991 SONATA SECURITY SYSTEM TROUBLESHOOTING
This TSB is provided to assist you in troubleshooting of three conditions which may occur on 1991 Sonata's equipped with a Hyundai security system.
Condition 1. The alarm chirps repeatedly when armed, instead of the correct single chirp.
Condition 2. The alarm will not always arm, but when it does, opening the trunk will not trigger it.
Condition 3. The alarm will not always enter the valet mode. (Valet mode is when the main
alarm switch is "off"). The security system never actually turns off, but the
alarm is prevented from completing its arming sequence. The alarm switch LED
will glow steadily when in valet mode.
RENDER: 1.0x
NO RELATED
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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.