Question about 1991 Buick Regal
If its shorting then the fuse should have already blown if it was of the correct amperidge
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
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Oct 10, 2017 | Cars & Trucks
Dec 21, 2016 | GMC Cars & Trucks
The CTD system commands the instrument cluster to control the telltale only when the ignition switch is OFF. The CTD system uses the telltale to identify system status.
Telltale FLASHING -- The system is in standby mode. The system is not ready to arm (a door is open).
Telltale ON STEADY -- The system is in delay mode. The system is ready to arm and is executing a time delay of 15 seconds before turning the lamp OFF and transitioning to armed mode.
Telltale OFF -- The system may or may not be armed.
Body Control Module (BCM) The body control module (BCM) monitors several inputs in order to arm and disarm the CTD system. The BCM controls the alarm function outputs. When the BCM detects an unauthorized entry (any door opened), the BCM applies ground to the horn, the park lamp and the headlamp relays. The BCM will send messages to the security telltale in the instrument cluster through the Class 2 serial data link. The BCM has the following 8 basic modes for operating the CTD system. The more detailed descriptions are below.
Arm initiated state
Arm delay state
The BCM has the following 6 discrete inputs in order to monitor the CTD system:
Driver door latch (door jamb) switch
Passenger door latch (door jamb) switch
Door lock relay
Door key switch
Passenger door unlock relay
The BCM applies ground once per second for approximately 2 minutes, or until a valid input to disarm the system is received by the BCM.
Check the door lock relay !
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