Pinpoint Tests AO: DTC B1318

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AO: DTC B1318

Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number

Normal Operation
- DTC B1318 (Battery Voltage Low) - sets in continuous memory and on-demand if the IC detects low battery voltage below 9 volts for 5 seconds on the voltage supply circuit.

This pinpoint test is intended to diagnose the following:

- Fuse(s)
- Wiring, terminals or connectors
- High circuit resistance
- IC



PINPOINT TEST AO: 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.

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AO1 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 AO2.

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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AO2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM


- Enter the following diagnostic mode on the scan tool: PCM 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.

No
GO to AO3.

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AO3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE


- Check the battery condition and verify that the battery is fully charged. Refer to Battery.
- Is the battery OK and fully charged?

Yes
GO to AO4.

No
REFER to Battery.

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AO4 CHECK THE IC VOLTAGE PID


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Monitor and compare the IC voltage PID (VBAT_1) against the measured battery voltage.
- Is the voltage PID within 0.2 volt of the recorded battery voltage?

Yes
GO to AO6.

No
GO to AO5.

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AO5 CHECK THE IC VOLTAGE SUPPLY


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: IC C220.
- Ignition ON.
- Measure the voltage between the IC C220-13, circuit SBP26 (YE/RD), harness side and ground.




- Is the voltage within 0.2 volt of the recorded battery voltage?

Yes
GO to AO6.

No
REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.

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AO6 CHECK THE IC GROUND CIRCUITS


- Ignition OFF.
- Measure the resistance between the IC C220-8, circuit GD133 (BK), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

No
REPAIR the circuit for high resistance. TEST the system for normal operation.

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