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.
(See BATTERY INSPECTION [L8, LF, L5].)

(See BATTERY INSPECTION [MZR-CD (RF Turbo)].)

(See BATTERY INSPECTION [MZR-CD 2.2].)

•  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

•  Is the generator normal?
(See GENERATOR INSPECTION [L8, LF, L5].)

(See GENERATOR INSPECTION [MZR-CD (RF Turbo)].)

(See GENERATOR INSPECTION [MZR-CD 2.2].)

Yes

Replace/charge the battery.

No

Replace the generator.

(See GENERATOR REMOVAL/INSTALLATION [L8, LF, L5].)

(See GENERATOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

(See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)

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.
(See CLEARING DTC [BCM].)

•  Switch the ignition to off , then ON.

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

•  Is the same DTC present?

Yes

Return to Step 1, and inspect for other malfunction locations.

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.

9

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Are there other DTCs output?

Yes

Perform the corresponding DTC inspection.

No

DTC troubleshooting completed.

Step	Inspection		Action
1	BATTERY INSPECTION • Disconnect the battery cables. • Refer to the battery inspection and inspect the battery. (See BATTERY INSPECTION [L8, LF, L5].) (See BATTERY INSPECTION [MZR-CD (RF Turbo)].) (See BATTERY INSPECTION [MZR-CD 2.2].) • Is the battery normal?	Yes	Go to step 4.
1		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.
2		No	Repair/replace the connector. After repair procedure, go to Step 8.
3	INSPECT GENERATOR • Is the generator normal? (See GENERATOR INSPECTION [L8, LF, L5].) (See GENERATOR INSPECTION [MZR-CD (RF Turbo)].) (See GENERATOR INSPECTION [MZR-CD 2.2].)	Yes	Replace/charge the battery.
3		No	Replace the generator. (See GENERATOR REMOVAL/INSTALLATION [L8, LF, L5].) (See GENERATOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].) (See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].) 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.
4		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.
5		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.
6		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.
7		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. (See CLEARING DTC [BCM].) • Switch the ignition to off , then ON. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Return to Step 1, and inspect for other malfunction locations. If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
8		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.
9		No	DTC troubleshooting completed.