RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
The microprocessor in the Side Impact Airbag Control Module (SIACM) contains the side curtain airbag system logic circuits and controls all of the
features of only the side curtain airbag mounted on the same side of the vehicle as the SIACM. The SIACM uses On-Board Diagnostics (OBD) and can
communicate with other electronic modules in the vehicle as well as with the DRB III scan tool using the Programmable Communications Interface
(PCI) data bus network. This method of communication is used by the SIACM to communicate with the Airbag Control Module (ACM) and for
supplemental restraint system diagnosis and testing through the 16-way data link connector located on the driver side lower edge of the instrument panel.
The ACM communicates with both the left and right SIACM over the PCI data bus.
The SIACM microprocessor continuously monitors all of the side curtain airbag electrical circuits to determine the system readiness. If the SIACM
detects a monitored system fault, it sets an active and stored Diagnostic Trouble Code (DTC) and sends electronic messages to the ACM over the PCI
data bus. The ACM will respond by sending an electronic message to the EMIC to turn on the airbag indicator, and by storing a DTC that will indicate
whether the left or the right SIACM has stored the DTC that initiated the airbag indicator illumination. An active fault only remains for the current
ignition switch cycle, while a stored fault causes a DTC to be stored in memory by the SIACM. For some DTCs, if a fault does not recur for a number of
ignition cycles, the SIACM will automatically erase the stored DTC. For other internal faults, the stored DTC is latched forever.
The SIACM receives battery current on a fused ignition switch output (run-start) circuit through a fuse in the Integrated Power Module (IPM). The
SIACM has a case ground through its mounting bracket and also receives a power ground through a ground circuit and take out of the body wire harness.
This take out has a single eyelet terminal connector that is secured by a ground screw to the body sheet metal. These connections allow the SIACM to be
operational whenever the ignition switch is in the Start or On positions. An electronic impact sensor is contained within the SIACM. The electronic
impact sensor is an accelerometer that senses the rate of vehicle deceleration, which provides verification of the direction and severity of an impact. A
pre-programmed decision algorithm in the SIACM microprocessor determines when the deceleration rate as signaled by the impact sensor indicates a
side impact that is severe enough to require side curtain airbag protection. When the programmed conditions are met, the SIACM sends the proper
electrical signals to deploy the side curtain airbag.
The hard wired inputs and outputs for the SIACM may be diagnosed and tested using conventional diagnostic tools and procedures. However,
conventional diagnostic methods will not prove conclusive in the diagnosis of the SIACM, the PCI data bus network, or the electronic message inputs to
and outputs from the SIACM. The most reliable, efficient, and accurate means to diagnose the SIACM, the PCI data bus network, and the electronic
message inputs to and outputs from the SIACM requires the use of a DRB III scan tool. Refer to the appropriate diagnostic information.
