Accessory Delay Module: Description and Operation

The Delayed Accessory Bus (DAB) System provides power to operate the Radio and Power Windows when the Ignition Switch has been turned "OFF" but before the driver or passenger door has been opened and if the system battery voltage is greater than 9.5 volts.

Voltage is applied at all times to one side of the DAB Relay Coil and to the DAB Relay "normally open" contacts through the Ignition Fuse. Power to the DAB Relay "normally closed" contacts is supplied through the Ignition Switch when Ignition is in "RUN" or "ACCY."

During Ignition "ON" operation, power is supplied to the Radio and Power Windows through the DAB Relay "normally closed" contacts. When the Central Control Module (CCM) senses an Ignition "ON" to "OFF" transition, it supplies ground to one side of the DAB Relay Coil, energizing the Relay. Once energized, power to operate the Radio and Power Windows will be supplied through the DAB Relay "normally open" contacts for approximately 15 minutes or until the driver or passenger door is opened, whichever occurs first.

The CCM detects the opening of the driver door through the LH Door Ajar Switch, which grounds the CCM LH Door Ajar Input (terminal "C12" - GRY connector). The CCM detects the opening of the passenger door through the RH Door Ajar Switch, which grounds the CCM RH Door Ajar Input (terminal "D16" - GRY connector). The CCM will then remove ground from the DAB Relay Coil, thus de-energizing the relay and removing power to the Radio and Power Windows until Ignition is again turned "ON."