Pinpoint Test F: DTC U3003:62
Body Control Module B (BCM-B)
Pinpoint Tests
Pinpoint Test F: DTC U3003:62
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Body Control Module B (BCM-B) monitors the voltage from the battery to determine if it goes above or below specific thresholds and sets DTC U3003:62 in continuous memory if the BCM-B detects battery voltage 1.5 volts above or below specific thresholds on the vehicle battery circuit SBB18.
- DTC U3003:62 (Battery Voltage: Signal Compare Failure) - a continuous memory DTC that sets when the BCM-B detects battery voltage 1.5 volts above or below specific thresholds on the vehicle battery circuit SBB18.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- High circuit resistance
- Charging system concern
- BCM-B
PINPOINT TEST F: DTC U3003:62
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.
NOTE: DTC U3003:62 may be stored in the module memory due to previous battery charging or vehicle jump starting events.
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F1 RECHECK THE BCM-B DTCs
- Ignition OFF.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: BCM-B Self-Test .
- Clear the DTCs. Repeat the BCM-B self-test.
- Is DTC U3003:62 still present?
Yes
GO to F2.
No
The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.
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F2 CHECK FOR DTCs B1317, B1318 B1676, P0563 OR U3003:62 SET IN OTHER MODULES
- Enter the following diagnostic mode on the scan tool: (All Modules) Self-Test .
- Retrieve the continuous memory DTCs (all CMDTCs) from all modules.
- Is DTC B1317, B1318, B1676, P0563 (PCM) or U3003:62 set in more than one module?
Yes
REFER to Charging System to diagnose the charging system condition.
No
GO to F3.
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F3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Ignition OFF.
- Check the battery condition and verify the battery is fully charged. Refer to Battery, Battery Condition Test. Pinpoint Tests
- Is the battery OK and fully charged?
Yes
GO to F4.
No
REFER to Charging System.
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F4 CHECK THE BATTERY VOLTAGE
- Turn off all interior/exterior lights and accessories.
- Start and run the engine at approximately 2,000 rpm for 3 minutes while monitoring the battery voltage.
- Does the battery voltage rise to 15 volts or higher?
Yes
REFER to Charging System to diagnose an overcharging condition.
No
GO to F5.
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F5 RECHECK FOR DTC U3003:62
- Turn the engine off.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: BCM-B Self-Test .
- Clear the continuous memory DTCs.
- Carry out the BCM-B self-test.
- Is DTC U3003:62 present?
Yes
GO to F6.
No
The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.
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F6 CHECK THE BCM-B VOLTAGE SUPPLY
- Measure and record the voltage at the battery.
- Disconnect: BCM-B C4368A .
- Ignition ON.
- Measure the voltage between the BCM-B C4368A-1, circuit SBB18 (YE/RD), harness side and ground.
- Is the voltage within 0.2 volt of the recorded battery voltage?
Yes
GO to F7.
No
REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.
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F7 CHECK THE BCM-B GROUND CIRCUIT
- Ignition OFF.
- Disconnect: Negative Battery Cable .
- Measure the resistance between the BCM-B C4368A-13, circuit GD110 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to F8.
No
REPAIR the circuit for high resistance. CONNECT the negative battery cable. TEST the system for normal operation.
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F8 CHECK FOR CORRECT BCM-B OPERATION
- Connect: Negative Battery Cable .
- Disconnect the BCM-B connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the BCM-B 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-B. REFER to Body Control Module B (BCM-B) Body Control Module B (BCM-B). 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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