Pinpoint Tests AP: DTC B1318

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AP: 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) - a continuous and on-demand DTC that sets in the Instrument Cluster (IC) if the IC detects low battery voltage on the B+ keep-alive memory voltage input, circuit 1001 (WH/YE).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- High circuit resistance
- IC



PINPOINT TEST AP: 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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AP1 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 AP2.

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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AP2 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 AP3.

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AP3 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 AP4.

No
REFER to Battery.

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AP4 CHECK THE IC VOLTAGE SUPPLY


- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: IC C220.
- Ignition ON.
- Measure the voltage between the IC C220-3, circuit 1001 (WH/YE), harness side and ground.




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

Yes
GO to AP5.

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

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AP5 CHECK THE IC GROUND CIRCUIT


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the IC C220-2, circuit 1205 (BK), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to AP6.

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

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AP6 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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