SL L4-1.9L SOHC VIN 9 (1991)
Audible Warning Device: Description and Operation
The chime system provides audible warnings for an unbuckled lap belt, unbuckled shoulder belt, key-in-ignition reminder and a lights-on reminder.
For information on the seat belt reminder, refer to AUTOMATIC SEATBELTS.
The chime sound consists of repetitive pulses of a 1000 Hz tone. The amplitude of each pulse decays gradually, as opposed to an abrupt beeping
sound. The following repetition rates distinguish the various reminders:
^
Seat belt - 40 cycles per minute
^
Key-In - 120 cycles per minute
^
Lights-On - 180 cycles per minute.
The chime module for the up-level Sedan and Coupe also provides a delayed dome lamp turnoff feature.
The chime system consists of a chime module (located in the I/P junction block), door jamb switch and an ignition switch with a key alarm switch.
Power to the chime system is supplied at all times.
CHIME MODULE OPERATION
Key Minder Audible
The chime module provides an audible warning if the key is in the ignition and conditions outlined in the following chart are present. The key minder
audible does not occur if the driver's door is closed. The following chart assumes the driver's door is open, the key is inserted into the ignition and the
ignition switch is moved through the positions in the order shown in the chart.
Audible Warnings Key Switch Positions
Key in LOCK position Audible
The chime module provides a delay so when the ignition switch is moved through the ACC position during normal starting of the vehicle, and the
driver's door is open, no audible occurs.
The key minder warning is provided on exit, not on entry, if the key is in the LOCK position. This enables the driver to enter the vehicle, insert the key
in the ignition switch before closing the driver's door and not hear the audible warning.
Lights On Minder Audible
The chime module provides an audible warning if the park lamps or headlamps are on, the driver's door is open and one of two conditions exist: The
key is out of the ignition switch, or the key is in the ignition at the LOCK position and has not been turned. If a condition exists calling for the key
minder audible and the lights on minder audible, the key minder audible takes priority.
Door Jamb Switch
The door jamb switch is a plunger type switch mounted in the B-pillar. When the driver's door is opened beyond a prescribed distance, the switch
contacts close signalling to the chime module that the door is open.
Ignition and Key Alarm Switch Assembly
The key minder circuit is a set of contacts which are activated by the ignition module mechanical driver. Closing this circuit pulls the chime module
and passive restraint control module inputs to ground. The ground circuit is provided by a wire ground to the switch.
