DTC U3003:16 [BCM]

id0902f5933600

DESCRIPTION

BCM power supply circuit malfunction
DETECTION CONDITION
•  BCM power supply circuit voltage is less than 9 V for 5 s or more.
POSSIBLE CAUSE
•  PCM DTC is stored.
•  Battery malfunction
•  Generator malfunction
•  BCM connector or terminals malfunction
•  BCM power supply circuit malfunction
―  Short to ground in wiring harness between the following:
•  METER 15 A fuse—BCM terminal 4T
•  HAZARD 15 A fuse—BCM terminal 4S
•  ROOM 15 A fuse—BCM terminal 3J
―  METER 15 A fuse malfunction
―  HAZARD 15 A fuse malfunction
―  BTN1 50 A fuse malfunction
―  ROOM 15 A fuse malfunction
―  Open circuit in wiring harness between the following:
•  Ignition switch (IG1)*1/IG1 relay*2—BCM terminal 4T
•  Battery positive terminal—BCM terminal 4S
•  Battery positive terminal—BCM terminal 3J
•  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 8.
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 [MZR 1.5, MZR 1.6].)
(See DTC TABLE [MZR 2.0, MZR 2.5].)
(See DTC TABLE [MZR 2.0 DISI i-stop].)
(See DTC TABLE [MZR 2.3 DISI Turbo].)
(See DTC TABLE [MZ-CD 1.6].)
(See DTC TABLE [MZR-CD 2.2].)
(See DTC TABLE [SKYACTIV-G 2.0].)
No
Go to the next step.
3
INSPECT BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Recharge or replace the battery, then go to Step 7.
(See BATTERY RECHARGING [MZR 1.5, MZR 1.6].)
(See BATTERY RECHARGING [MZR 2.0, MZR 2.5].)
(See BATTERY RECHARGING [MZR 2.0 DISI i-stop].)
(See BATTERY RECHARGING [MZR 2.3 DISI Turbo].)
(See BATTERY RECHARGING [MZ-CD 1.6].)
(See BATTERY RECHARGING [MZR-CD 2.2].)
(See BATTERY RECHARGING [SKYACTIV-G 2.0].)
(See BATTERY REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
(See BATTERY REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
(See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6].)
(See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Go to the next step.
4
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Replace the generator, then go to Step 7.
(See GENERATOR REMOVAL/INSTALLATION [MZR 1.5, MZR 1.6].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
(See GENERATOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
(See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Go to the next step.
5
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 7.
No
Go to the next step.
6
INSPECT BCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT AND SHORT TO GROUND
•  Verify that the 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
Inspect the METER 15 A fuse, HAZARD 15 A fuse, BTN1 50 A fuse or ROOM 15 A fuse.
•  If the fuse is blown:
―  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.
Go to the next step.
7
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all 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
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the BCM.
Go to the next step.
No
Go to the next step.
8
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.