DTC U3003:16/U3003:17 [BCM]

id0902f5310100

Description

• DTC U3003:16: BCM power supply voltage low (less than 10 V)

• DTC U3003:17: BCM power supply voltage high (16 V or more)

Detection Condition

• DTC U3003:16: BCM power supply voltage less than 10 V for 20 s or more.

• DTC U3003:17: BCM power supply voltage 16 V or more for 10 s or more.

Possible Causes

• Battery malfunction

• Generator malfunction

• BCM connector or terminals malfunction

• Short to ground or open circuit in BCM power supply circuit

― Short to ground in wiring harness between the following:

• D/L 20 A fuse―BCM terminal 1P

• HAZARD 10 A fuse―BCM terminal 1I

― D/L 20 A fuse malfunction

― HAZARD 10 A fuse malfunction

― Open circuit in wiring harness between the following:

• Battery positive terminal―BCM terminal 1P

• Battery positive terminal―BCM terminal 1I

• BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

VERIFY BCM DTCs

•  Clear the DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Turn the ignition switch to the ON position and wait for 20 s or more.

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is the same DTC present?

Yes

Go to the next step.

No

Go to Step 8.

2

PERFORM PCM DTC INSPECTION

•  Perform the PCM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].)

(See MZ-CD 1.6.)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 1.3, MZR 1.5].)

(See MZ-CD 1.6.)

No

Go to the next step.

3

INSPECT BATTERY

•  Inspect the battery.
(See BATTERY INSPECTION [MZR 1.3, MZR 1.5].)

(See BATTERY INSPECTION [MZ-CD 1.6].)

•  Is there any malfunction?

Yes

Recharge or replace the battery, then go to Step 7.

(See BATTERY RECHARGING [MZR 1.3, MZR 1.5].)

(See BATTERY RECHARGING [MZ-CD 1.6].)

(See BATTERY REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

(See .BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6])

No

Go to the next step.

4

INSPECT GENERATOR

•  Inspect the generator.
(See GENERATOR INSPECTION [MZR 1.3, MZR 1.5].)

(See GENERATOR INSPECTION [MZ-CD 1.6].)

•  Is there any malfunction?

Yes

Replace the generator, then go to Step 7.

(See GENERATOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

(See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6].)

No

Go to the next step.

5

INSPECT BCM CONNECTOR AND TERMINALS

•  Turn the ignition switch to the LOCK position.

•  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.

•  Measure the voltage at the following terminals (wiring harness-side):

―  BCM terminal 1P

―  BCM terminal 1I

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the D/L 20 A fuse and HAZARD 10 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.

Go to the next step.

7

VERIFY TROUBLESHOOTING COMPLETED

•  Make sure to reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

•  Clear the DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Turn the ignition switch to the ON position and wait for 20 s or more.

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

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.

Step	Inspection		Action
1	VERIFY BCM DTCs • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Turn the ignition switch to the ON position and wait for 20 s or more. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Go to the next step.
1		No	Go to Step 8.
2	PERFORM PCM DTC INSPECTION • Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) (See MZ-CD 1.6.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.3, MZR 1.5].) (See MZ-CD 1.6.)
2		No	Go to the next step.
3	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [MZR 1.3, MZR 1.5].) (See BATTERY INSPECTION [MZ-CD 1.6].) • Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 7. (See BATTERY RECHARGING [MZR 1.3, MZR 1.5].) (See BATTERY RECHARGING [MZ-CD 1.6].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].) (See .BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6])
3		No	Go to the next step.
4	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [MZR 1.3, MZR 1.5].) (See GENERATOR INSPECTION [MZ-CD 1.6].) • Is there any malfunction?	Yes	Replace the generator, then go to Step 7. (See GENERATOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].) (See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6].)
4		No	Go to the next step.
5	INSPECT BCM CONNECTOR AND TERMINALS • Turn the ignition switch to the LOCK position. • 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.
5		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. • Measure the voltage at the following terminals (wiring harness-side): ― BCM terminal 1P ― BCM terminal 1I • Is the voltage B+?	Yes	Go to the next step.
6		No	Inspect the D/L 20 A fuse and HAZARD 10 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. Go to the next step.
7	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Turn the ignition switch to the ON position and wait for 20 s or more. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
7		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].)
8		No	DTC troubleshooting completed.