DTC U3003:16 [BCM]

id0902f5933600

DESCRIPTION

Power supply circuit malfunction
DETECTION CONDITION
•  BCM power supply circuit voltage is lower than 9 V for 5 s or more.
POSSIBLE CAUSE
•  Charging system malfunction
―  PCM DTC is stored
•  BCM connector or terminals malfunction
•  Open circuit or short to ground in BCM power supply circuit
―  Short to ground in wiring harness between the following terminal:
•  BCM terminal 4T—Ignition switch terminal A*1/Relay block terminal 1B*2
•  BCM terminal 4S—Battery positive terminal
•  BCM terminal 3J—Battery positive terminal
―  METER 15 A fuse malfunction
―  HAZARD 15 A fuse malfunction
―  Open circuit in wiring harness between the following terminal:
•  BCM terminal 4T—Ignition switch terminal A*1/Relay block terminal 1B*2
•  BCM terminal 4S—Battery positive terminal
•  BCM terminal 3J—Battery positive terminal
•  BCM malfunction

*1  :Vehicles without advanced keyless entry and push button start system
*2  :Vehicles with advanced keyless entry and push button start system

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
CONFIRM BCM DTC
•  Clear the DTC using the M-MDS.
•  Switch the ignition to ON and wait for 5 s or more.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 6.
2
CONFIRM PCM DTC
•  Perform the PCM DTC inspection using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [LF, L5].)
(See DTC TABLE [ZY, Z6].)
(See DTC TABLE [L3 Turbo].)
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO5 emission level)].)
(See DTC TABLE [MZR-CD 2.2].)
(See DTC TABLE [MZR 2.0 DISI i-stop].)
No
Go to the next step.
3
INSPECT BCM CONNECTOR AND TERMINALS
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the BCM connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 5.
No
Go to the next step.
4
INSPECT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  BCM connector is disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the following terminals (wiring harness-side):
―  BCM terminal 4T
―  BCM terminal 4S
―  BCM terminal 3J
•  Is the voltage B+?
Yes
Go to the next step.
No
If the BCM terminal 4T or 4S voltage is not B+:
•  Inspect the METER 15 A fuse or HAZARD 15 A fuse.
―  If the fuse is melt:
•  Repair or replace the wiring harness for a possible short to ground.
•  Replace the malfunctioning fuse.
―  If the fuse is deterioration:
•  Replace the malfunctioning fuse.
―  If the fuse is normal:
•  Repair or replace the wiring harness for a possible open circuit.
If the BCM terminal 3J voltage is not B+:
•  Repair or replace the wiring harness for a possible open circuit or short to ground.
Go to the next step.
5
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC using the M-MDS.
•  Switch the ignition to ON and wait for 5 s or more.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the same DTC present?
Yes
Replace the BCM, then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [L.H.D.].)
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
6
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [BCM].)
No
DTC troubleshooting completed.