Alarm System - Troubleshooting Tips
Group90 - ELECTRICAL
Number
91-90-020
Date
06-1991
Model
Sonata 1991
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.
SECURITY SYSTEM ARMING PROCEDURE:
(These procedures are needed for troubleshooting)
1. TURNING SECURITY SYSTEM ON:
Turn ignition switch to "IGN" position.
2. Turn main alarm switch on (in position).
3. Turn ignition switch off.
4. ARMING SYSTEM:
Base security system will arm 20 seconds after the ignition switch is off and all doors and trunk are closed.
5. Remote security system will arm whenever ignition switch is off all doors and trunk are closed and button 1 on remote is pushed. Arming is indicated by one chirp and one flash of parking lights. (Disarming is indicated by three flashes of parking lights.)
TROUBLESHOOTING PROCEDURE:
Condition 1: The alarm chirps repeatedly when armed.
CAUSE:
Incorrect wire harness installed.
DIAGNOSIS:
The dome light switch must be set in the middle position (door activated). Arm the system with the door open, then close the door. The siren should chirp once. If the chirping continues until the dome light is fully out, then the alarm was installed with an incorrect wire harness.
CORRECTION:
Order 1991 Sonata Security System Installation Kit, P/N: 00207-Y1000. Remove existing wire harness and replace with the new harness. Be sure to make the new T-tap connections as per Section E of the installation instructions.
TROUBLESHOOTING PROCEDURE:
Condition 2: The alarm will not always arm (one chirp and one flash), but when it does, it will not trigger when the trunk is opened.
CAUSE:
6. TWO CONDITIONS WILL PREVENT THE ALARM FROM ARMING:
No power to alarm control module due to incomplete electrical connections.
7. Incomplete connections from alarm control module to trunk or door switches.
DIAGNOSIS:
8. Try to arm system with the main alarm switch - the LED should glow steadily. If the LED does not illuminate, check to see that the switch is connected to the adapter cable, which is connected to the security system wire harness. If that is correct, check for correct ignition and battery voltage levels shown.
9. Also check that the black ground wire is tightly secured under the alarm module mounting bracket bolt (to the right of the steering column). If these voltage levels are correct, all connectors are connected, and the system still will not enter the valet mode, then either the main alarm switch or the alarm control module is malfunctioning.
10. If the alarm enters the valet mode properly, but will not arm, then there is an input to the alarm module indicating either a door or the trunk is open.
Trunk input verification: The alarm trunk input wire is a blue alarm wire connected behind the instrument cluster to the blue w/yellow stripe vehicle wire. The blue w/yellow stripe vehicle wire is routed to connector M07-5. Early Ulsan, Korea produced vehicles with VINs ending in MU256000 or lower, (VINS with MBXXXXXX are Canadian built) may have an extra blue w/yellow stripe wire in the same bunch. With the lower crash pad and the alarm module mounting bracket removed, look up behind the instrument cluster (I.C.). Near the speedometer cable, a wire harness bundle leads to the back of the I.C. Pull gently on the wire bundle until you can see the end of the sheath. The wires divide into two branches to connector M07-4 and M07-5. The connection should be to the blue w/yellow stripe wire that is routed with the blue w/red stripe wire to connector M07-5.
The door input verification: The light green alarm wire connected to the blue w/black stripe vehicle wire at the E.T.A.C. connector M80-1 is the door input. Be sure all doors are closed. Connect a test light between + 12v and this wire and then open one of the doors to be sure that the test light glows. indicating a ground signal.
TROUBLESHOOTING PROCEDURE:
Condition 3: The alarm will not always enter the valet mode, even though the switch is off (out).
CAUSE:
Faulty main alarm control switch.
DIAGNOSIS:
Arm the alarm, turn the ignition key on 10 the ignition position to disarm the alarm, push the alarm button so it comes to its full out position (valet mode), then turn the ignition key off. If the LED on the alarm switch comes on and stays on, the system is in the valet mode and is operating properly. If the system chirps when the key is turned off then it is not entering the valet mode. This is caused by a faulty alarm switch.
CORRECTION:
Remove the radio fascia panel to the remove and replace switch. Install 1991 Sonata Main Control Switch P/N = 00207-Y1020.
WARRANTY INFORMATION
INSTALLATION NOTES:
The initial batch of 1991 Sonata Installation Kits have slight differences between the installation instructions and the kit contents. The main branch of the wire hamess, with eight wires, has been separated into two (2) branches; one of six wires, and one of two wires. Simply route these two together during the installation. It does not impact the kits operation.
The door lock circuit wire is easy to misconnect. The green w/white stripe vehicle wire used for the door lock circuit is in connector MD01 near another green w/white stripe wire. Be sure to connect the green w/white stripe alarm wire to the light green w/white stripe vehicle wire, NOT the dark green w/white stripe vehicle wire. If the alarm module 15 amp fuse blows every time the system is armed, causing the parking lights not to flash, this is probably the problem.
The Security System vendor provides a Technical Service hotline. Call 1-800-782-8246 8AM - 5PM Pacific time or 1-800-645-4994, 8AM - 5PM Eastern time, Monday through Friday. Ask for Tech Services or Customer Service.