Pinpoint Test C: DTC B1318
Smart Junction Box (SJB)
Pinpoint Tests
Pinpoint Test C: DTC B1318
Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number
Normal Operation
- DTC B1318 (Battery Voltage Low) - a continuous memory DTC that sets when the SJB detects battery voltage below 10 volts.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- High circuit resistance
- SJB
PINPOINT TEST C: DTC B1318
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed results in false resistance readings. Refer to Battery, Mounting and Cables Service and Repair.
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C1 RECHECK THE SJB DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test .
- Clear the DTCs. Repeat the SJB self-test.
- Is DTC B1318 still present?
Yes
GO to C2.
No
The system is operating normally at this time. The DTC may have been set due to a previous low battery voltage condition.
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C2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM
- Enter the following diagnostic mode on the scan tool: PCM Self-Test .
- Carry out the PCM KOEO self-test.
- Retrieve the continuous memory DTCs from the PCM.
- Is DTC P0562, P0620, P0622, P0625, P0626 or P065B set in the PCM?
Yes
REFER to Charging System Testing and Inspection.
No
GO to C3.
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C3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Ignition OFF.
- Check the battery condition and verify the battery is fully charged. Refer to Battery, Mounting and Cables Testing and Inspection.
- Is the battery OK and fully charged?
Yes
GO to C4.
No
REFER to Charging System Testing and Inspection.
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C4 CHECK THE SJB VOLTAGE PID
- Ignition ON.
- Measure and record the voltage at the battery.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB voltage PID (GEM_VBAT).
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to C7.
No
GO to C5.
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C5 CHECK THE SJB VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: SJB C2280g .
- Ignition ON.
- Measure the voltage between the SJB C2280g-1, circuit SBB01 (RD), harness side and ground.
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to C6.
No
REPAIR circuit SBB01 (RD) for high resistance. CLEAR the DTC. REPEAT the self-test.
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C6 CHECK THE SJB GROUND CIRCUIT FOR HIGH RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable .
- Disconnect: SJB C2280d .
- Measure the resistance between the SJB and ground as follows:
- Are the resistances less than 5 ohms?
Yes
GO to C7.
No
REPAIR the ground circuit in question for high resistance. CLEAR the DTC. REPEAT the self-test.
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C7 CHECK FOR CORRECT SJB OPERATION
- Disconnect the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. REFER to Smart Junction Box (SJB) Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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