Air Bag Systems

PINPOINT TEST 25: DTCs B1317, B1318, U3003:16 AND U3003:17

Normal Operation - Restraints Control Module (RCM)

The Restraints Control Module (RCM) continuously monitors the input voltage for correct operation. If the RCM detects input voltage below 9.5 volts, it will store DTC U3003:16 in memory. If the RCM detects input voltage of 20 volts, it will store DTC U3003:17 in memory. If the RCM sets DTC U3003:16 or U3003:17, it will send a message to the Instrument Cluster (IC) to illuminate the air bag warning indicator.

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 to illuminate the air bag warning indicator.
NOTE:DTCs B1317, B1318, B1676 U3003:16 and U3003:17 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.

U3003:16-U3003:17 / B1317-B1318:

Possible Causes
- Wiring, terminals or connectors
- OCSM
- RCM

Diagnostic Procedure

WARNING:Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the safety canopy and cause serious personal injury or death.

WARNING:Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.

CAUTION:Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

CAUTION:Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE:Supplemental Restraint System (SRS) components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE:The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

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