Pinpoint Test F: DTC U3003:16
Body Control Module (BCM)
Pinpoint Tests
Pinpoint Test F: DTC U3003:16
Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number
Normal Operation
- DTC U3003:16 (Battery Voltage: Circuit Voltage Below threshold) - sets in the Body Control Module (BCM) when the BCM detects that battery voltage has dropped below 9 volts on the voltage supply circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- High circuit resistance
- BCM
PINPOINT TEST F: DTC U3003:16
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 / Connect.
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F1 RECHECK THE BCM DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: BCM Self-Test.
- Clear the DTCs. Repeat the BCM self-test.
- Is DTC U3003:16 still present?
Yes
GO to F2.
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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F2 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 P0620, P0622, P0625, P0626 or P065B set in the PCM?
Yes
REFER to Charging System Testing and Inspection.
No
GO to F3.
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F3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- 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 F4.
No
REFER to Charging System Testing and Inspection.
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F4 CHECK THE BCM VOLTAGE PID
- Ignition ON.
- Measure and record the voltage at the battery.
- Enter the following diagnostic mode on the scan tool: BCM DataLogger.
- Monitor the BCM voltage PID (V_BATT).
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to F7.
No
GO to F5.
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F5 CHECK THE BCM VOLTAGE SUPPLY
- Ignition OFF.
- Disconnect: BCM C2280h .
- Ignition ON.
- Measure the voltage between the BCM C2280h-1, circuit SBF03 (RD), harness side and ground.
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to F6.
No
REPAIR circuit SBF03 (RD) for high resistance. CLEAR the DTC. REPEAT the self-test.
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F6 CHECK THE BCM GROUND CIRCUIT FOR HIGH RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable .
- Disconnect: BCM C2280d .
- Measure the resistance between the BCM C2280d-25, circuit GD133 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to F7.
No
REPAIR circuit GD133 (BK) for high resistance. CLEAR the DTC. REPEAT the self-test.
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F7 CHECK FOR CORRECT BCM OPERATION
- Disconnect the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the BCM 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 BCM. REFER to Body Control Module (BCM) 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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