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 stores DTC B1318 in memory. If the OCSM detects input voltage above 17.2 volts, it stores DTC B1317 in memory. If the OCSM sets DTC B1317 or B1318, it sends a fault message to the RCM. The RCM then sends a message to the IPC module to illuminate the air bag warning indicator.

DTC DESCRIPTION

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 sets 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 sets this DTC.
B1317 - Battery Voltage High	If the OCSM detects voltage above 17.2 volts, it sets this DTC.
B1318 - Battery Voltage Low	If the OCSM detects voltage below 8 volts, it sets this DTC.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
RCM
OCSM