Pinpoint Test Z: DTC B1317/B1318
Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
Pinpoint Tests
Pinpoint Test Z: DTC B1317/B1318
Refer to Wiring Diagram Set 46, Supplemental Restraint System for schematic and connector information. Diagrams By Number
NOTE: DTCs B1317, B1318 or B1676 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.
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 volts, it will store DTC B1318 in memory. If the RCM detects input voltage of 20 volts, it will store DTC B1317 in memory. If the RCM sets DTC B1317 or B1318, it will send a message to the Instrument Cluster (IC) module 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 module to illuminate the air bag warning indicator.
DTC B1317-DTC B1318:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RCM
- OCSM
PINPOINT TEST Z: DTC B1317/B1318
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(R) 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.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification
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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Z1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - ALL CMDTC (Continuous Memory).
- Is DTC B1317, B1318 or B1676 present in one or more modules AND P0563, P0620, P0625, P0626 or P065B retrieved from the PCM?
Yes
REFER to Charging System to diagnose the charging system.
No
GO to Z2.
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Z2 TEST BATTERY CONDITION
NOTE: DTCs B1317, B1318 or B1676 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.
- Ignition OFF.
- Carry out the Battery Condition Test. Refer to Battery. Pinpoint Tests
- Did the battery pass the condition test?
Yes
If the battery passed the condition test but required a recharge, REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.
If the battery passed the condition test and did not require a recharge, GO to Z3.
No
INSTALL a new battery. CLEAR all CMDTCs. TEST the SRS for normal operation.
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Z3 CHECK CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 rpm while performing this step or the generator may self excite and result in default charging system output voltage. If engine speed goes above 2,000 rpm, shut the vehicle OFF and restart the engine before performing this step.
- Measure the voltage of the battery:
- For DTC B1317, turn off all accessories and run the engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
- For DTC B1318, turn on headlights and HVAC fan on high and run engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
- Is the voltage between 13 and 15.2 volts?
Yes
For DTC B1318, GO to Z4.
For DTC B1317, GO to Z6.
No
REFER to Charging System to diagnose the charging system. CLEAR all CMDTCs. TEST the SRS for normal operation.
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Z4 CHECK FOR OPEN IGNITION CIRCUIT TO THE MODULE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect the module with the concern:
- For the RCM, disconnect C310a and C310b.
- For the OCSM, disconnect C3285.
- Measure the resistance of the ignition circuit:
- For the RCM, measure the resistance between RCM C310a-24, circuit CBP32 (GN/VT), harness side and Smart Junction Box (SJB) fuse 32.
- For the OCSM, measure the resistance between OCSM C3285-1, circuit CBP46 (WH/BU), harness side and SJB fuse 46.
- Is resistance less than 1 ohm?
Yes
GO to Z5.
No
REPAIR the circuit as necessary. CLEAR all CMDTCs. TEST the SRS for normal operation.
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Z5 CHECK FOR OPEN GROUND TO THE MODULE
- Measure the resistance of the ground circuit:
- For the RCM, measure the resistance between the RCM case and a good ground.
- For the OCSM, measure the resistance between OCSM C3159-14, circuit GD145 (BK), harness side and ground.
- Is resistance less than 5 ohms?
Yes
GO to Z6.
No
For the RCM, MAKE SURE there is no corrosion between the RCM case and mounting. MAKE
SURE the fasteners are clean and tightened to specification with no corrosion. REPAIR as necessary.
For the OCSM, REPAIR circuit GD145 (BK) as necessary.
CLEAR all CMDTCs. TEST the SRS for normal operation.
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Z6 CHECK FOR MODULE OPERATION
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect the module with the concern:
- For the RCM, disconnect C310a and C310b.
- For the OCSM, disconnect C3159.
- Check for the following:
- corrosion.
- damaged pins.
- pushed-out pins.
- Connect the RCM C310a and C310b or OCSM C3159 and make sure the connector seats correctly.
- Repower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new module. REFER to Restraints Control Module (RCM) Service and Repair or Occupant Classification Sensor - Original Equipment Occupant Classification Sensor - Original Equipment or
Occupant Classification Sensor - Service Kit Occupant Classification Sensor - Service Kit.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs. TEST the SRS for normal operation.
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