Pinpoint Test AT: DTC B1318

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AT: DTC B1318

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

Normal Operation

- DTC B1318 (Battery Voltage Low)- sets in continuous memory and on-demand in the Instrument Cluster (IC) if the IC (Instrument Cluster) detects battery voltage below 9 volts on the voltage supply circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- High circuit resistance

- IC (Instrument Cluster)

PINPOINT TEST AT : 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.

AT1 RECHECK THE IC (Instrument Cluster) DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) Self-Test.

- Clear the DTCs. Repeat the IC (Instrument Cluster) self-test.

Is DTC B1318 still present?

Yes
GO to AT2.

No
The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

AT2 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.

No
GO to AT3.

AT3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

- Check the battery condition and verify that the battery is fully charged.

Is the battery OK and fully charged?

Yes
GO to AT4.

No
REFER to Battery.

AT4 CHECK THE IC (Instrument Cluster) VOLTAGE SUPPLY

- Ignition OFF.

- Measure and record the voltage at the battery.

- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.

- Monitor and compare the IC (Instrument Cluster) voltage PID (VBAT_1) against the measured battery voltage.

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

Yes
GO to AT7.

No
GO to AT5.

AT5 CHECK THE IC (Instrument Cluster) VOLTAGE SUPPLY

- Ignition OFF.

- Disconnect: IC (Instrument Cluster) C220.

- Ignition ON.

- Measure the voltage between the IC (Instrument Cluster) C220-19, circuit SBP26 (YE/RD), harness side and ground.





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

Yes
GO to AT6.

No
REPAIR circuit SBP26 (YE/RD) for high resistance. CLEAR the DTC. REPEAT the self-test.

AT6 CHECK THE IC (Instrument Cluster) GROUND CIRCUITS

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the IC (Instrument Cluster) C220-9, circuit GD112 (BK/GN), harness side and ground; and between the IC (Instrument Cluster) C220-10, circuit GD114 (BK/BU), harness side and ground.





Is the resistance less than 5 ohms?

Yes
GO to AT7.

No
REPAIR circuits GD112 (BK/GN) and GD114 (BK/BU) for high resistance. CLEAR the DTCs. REPEAT the self-test.

AT7 CHECK FOR CORRECT IC (Instrument Cluster) OPERATION

- Disconnect the IC (Instrument Cluster) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the IC (Instrument Cluster) 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 (Instrument Cluster). REFER to 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.