Pinpoint Test AG: DTC B1318
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AG: DTC B1318
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number
- DTC B1318 (Battery Voltage Low) - a continuous memory DTC that sets if the Instrument Cluster (IC) detects battery voltage below 9 volts on the keep-alive voltage input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- High circuit resistance
- IC
PINPOINT TEST AG: 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 will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.
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AG1 RECHECK THE IC DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC Self-Test.
- Clear the DTCs. Repeat the IC self-test.
- Is DTC B1318 still present?
Yes
GO to AG2.
No
The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.
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AG2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM
- Enter the following diagnostic mode on the scan tool: PCM Self-Test.
- Carry out the PCM Key ON Engine OFF (KOEO) self-test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC P0620, P0622, P0625, P0626 or P065B set in the PCM?
Yes
REFER to Charging System Testing and Inspection.
No
GO to AG3.
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AG3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Check the battery condition and verify that the battery is fully charged. Refer to Battery, Mounting and Cables Testing and Inspection.
- Is the battery OK and fully charged?
Yes
GO to AG4.
No
REFER to Battery, Mounting and Cables Testing and Inspection.
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AG4 CHECK THE IC VOLTAGE INPUT
- Ignition ON.
- Measure and record the voltage at the battery.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Monitor the IC voltage PID (VBAT_1).
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to AG7.
No
GO to AG5.
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AG5 CHECK THE IC VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: IC C220.
- Ignition ON.
- Measure the voltage between the IC C220-1, circuit 1566 (RD/YE), harness side and ground.
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to AG6.
No
REPAIR circuit 1566 (RD/YE) for high resistance. CLEAR the DTC. REPEAT the self-test.
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AG6 CHECK THE IC GROUND CIRCUIT
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the IC C220-2, circuit 676 (PK/OG), harness side and ground; and between the IC C220-18, circuit 57 (BK), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
GO to AG7.
No
REPAIR the circuit in question for high resistance. CLEAR the DTCs. REPEAT the self-test.
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AG7 CHECK FOR CORRECT IC OPERATION
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). 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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