DTC U3003:16/U3003:17 [BCM]


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Malfunction Location

•  BCM power supply voltage malfunction

Detection Condition

•  BCM power supply voltage is other than 9-15.9V
―  DTC U3003:16 BCM power supply voltage low (less than 10 V)
―  DTC U3003:17 BCM power supply voltage increases (16 V or more)

Possible Causes

•  Open or short circuit to ground in wiring harness between battery positive terminal and BCM terminal 2J
•  HAZARD 10 A fuse malfunction
•  Battery malfunction
•  Generator system malfunction
•  BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1
BATTERY INSPECTION
•  Disconnect the battery cables.
•  Refer to the battery inspection and inspect the battery.
•  Is the battery normal?
Yes
Go to step 4.
No
Go to the next step.
2
INSPECT GENERATOR CONNECTOR CONDITION
•  Disconnect the generator connector.
•  Inspect for proper connector connections, connection conditions, damage, rust, or deformation.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector.
After repair procedure, go to Step 8.
3
INSPECT GENERATOR
Yes
Replace/charge the battery.
No
Replace the generator.
After replacement, go to Step 8.
4
FUSE INSPECTION
•  Remove the HAZARD 10 A fuse.
•  Is the fuse normal?
Yes
Go to the next step.
No
Replace the fuse.
After replacement, go to Step 8.
5
INSPECT BCM CONNECTOR CONDITION
•  Disconnect the BCM connector.
•  Inspect for proper connector connections, connection conditions, damage, rust, or deformation.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector.
After repair procedure, go to step 8.
6
INSPECT BCM POWER SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND
•  Inspect for continuity between BCM terminal 2J and body ground.
•  Is there continuity?
Yes
Repair/replace the wiring harness.
After repair procedure, go to step 8.
No
Go to the next step.
7
INSPECT BCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Inspect for continuity between BCM terminal 2J and battery positive terminal.
•  Is there continuity?
Yes
Go to the next step.
No
Repair/replace the wiring harness.
After repair procedure, go to the next step.
8
Verify DTC
•  Install the fuse.
•  Reconnect the disconnected connectors and battery cables, then switch the ignition to ON.
•  Clear the DTC from the BCM memory using the M-MDS.
•  Switch the ignition to off , then ON.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Return to Step 1, and inspect for other malfunction locations.
If the malfunction recurs, replace the BCM.
Go to the next step.
No
Go to the next step.
9
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are there other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.