Normal Operation - Occupant Classification System Module (OCSM)

The Occupant Classification System Module (OCSM) continuously monitors the input voltage for correct operation. If the OCSM detects input voltage below 8 volts, it will store DTC B1318 in memory. If the OCSM detects input voltage above 17.2 volts, it will store DTC B1317 in memory. If the OCSM sets DTC B1317 or B1318, it will send a fault message to the RCM . The RCM will then send a message to the IC module to illuminate the air bag warning indicator.

DTC DESCRIPTION CHART

DTC Description	Fault Trigger Conditions
U3003:16 - Battery Voltage: Circuit Voltage Below Threshold	If the RCM detects voltage below 9.5 volts with a Supplemental Restraint System (SRS) fault, it will set this DTC.
U3003:17 - Battery Voltage: Circuit Voltage Above Threshold	If the RCM detects voltage above 16 volts with a SRS fault or above 20 volts without a SRS fault, it will set this DTC.
B1317 - Battery Voltage High	If the OCSM detects voltage above 17.2 volts, it will set this DTC.
B1318 - Battery Voltage Low	If the OCSM detects voltage below 8 volts, it will set this DTC.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
RCM
OCSM