DTC U3003:16/U3003:17 [BCM]

id0902f5310100

Malfunction Location

• 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

• BCM power supply voltage is other than 10–16V

Possible Causes

• Battery malfunction

• D/L 20 A fuse malfunction

• HAZARD 10 A fuse malfunction

• Generator system malfunction

• Short or open circuit to ground or power supply in wiring harness between positive battery terminal and BCM terminals 1J or 1P

• Short or open circuit to power supply in wiring harness between BCM terminal 2P and body ground

• BCM malfunction

System Wiring Diagram

am2zzw00002297

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM DTC INSPECTION

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

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

•  Are DTCs U3003:16, U3003:17 displayed?

Yes

Go to the next step.

No

DTC troubleshooting completed.

2

BATTERY INSPECTION

•  Refer to the battery inspection and inspect the battery.
(See BATTERY INSPECTION [ZJ, ZY].)

(See BATTERY INSPECTION [MZ-CD 1.4 DI Turbo].)

•  Is the battery normal?

Yes

Go to the next step.

No

Replace or charge the battery, then go to the final step.

(See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].)

(See .BATTERY REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo])

(See BATTERY RECHARGING [ZJ, ZY].)

(See BATTERY RECHARGING [MZ-CD 1.4 DI Turbo].)

3

FUSE INSPECTION

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Remove the D/L 20 A and HAZARD 10 A fuses.

•  Are the fuses normal?

Yes

Go to the next step.

No

Replace either the D/L 20 A or HAZARD 10 A fuses, then go to the final step.

4

VERIFY WIRING HARNESS BETWEEN POSITIVE BATTERY TERMINAL AND BCM FOR OPEN CIRCUIT

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Install the D/L 20 A and HAZARD 10 A fuses.

•  Remove the dashboard under cover (passenger's side).
(See DASHBOARD UNDER COVER REMOVAL/INSTALLATION.)

•  Remove the front scuff plate (passenger's side).
(See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

•  Remove the front side trim (passenger's side).
(See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

•  Connect the negative battery cable.

•  Measure the voltage of the BCM terminal 1J and terminal1P.

•  Is the voltage between 10—15.9 V?

Yes

Go to the next step.

No

Repair the related wiring harness, then go to the final step.

5

INSPECT WIRING HARNESS BETWEEN BCM AND BODY GROUND

•  Inspect the wiring harness between BCM connector terminal 2P and body ground.

―  Short to power supply

―  Open circuit

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the wiring harness between the BCM and body ground, then go to the final step.

6

VERIFY TROUBLESHOOTING COMPLETED

•  Connect the BCM connector.

•  Connect the negative battery cable.

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

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

•  Are DTCs U3003:16, U3003:17 displayed?

Yes

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	PERFORM DTC INSPECTION • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Are DTCs U3003:16, U3003:17 displayed?	Yes	Go to the next step.
1		No	DTC troubleshooting completed.
2	BATTERY INSPECTION • Refer to the battery inspection and inspect the battery. (See BATTERY INSPECTION [ZJ, ZY].) (See BATTERY INSPECTION [MZ-CD 1.4 DI Turbo].) • Is the battery normal?	Yes	Go to the next step.
2		No	Replace or charge the battery, then go to the final step. (See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].) (See .BATTERY REMOVAL/INSTALLATION [MZ-CD 1.4 DI Turbo]) (See BATTERY RECHARGING [ZJ, ZY].) (See BATTERY RECHARGING [MZ-CD 1.4 DI Turbo].)
3	FUSE INSPECTION • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Remove the D/L 20 A and HAZARD 10 A fuses. • Are the fuses normal?	Yes	Go to the next step.
3		No	Replace either the D/L 20 A or HAZARD 10 A fuses, then go to the final step.
4	VERIFY WIRING HARNESS BETWEEN POSITIVE BATTERY TERMINAL AND BCM FOR OPEN CIRCUIT • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Install the D/L 20 A and HAZARD 10 A fuses. • Remove the dashboard under cover (passenger's side). (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION.) • Remove the front scuff plate (passenger's side). (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.) • Remove the front side trim (passenger's side). (See FRONT SIDE TRIM REMOVAL/INSTALLATION.) • Connect the negative battery cable. • Measure the voltage of the BCM terminal 1J and terminal1P. • Is the voltage between 10—15.9 V?	Yes	Go to the next step.
4		No	Repair the related wiring harness, then go to the final step.
5	INSPECT WIRING HARNESS BETWEEN BCM AND BODY GROUND • Inspect the wiring harness between BCM connector terminal 2P and body ground. ― Short to power supply ― Open circuit • Is the wiring harness normal?	Yes	Go to the next step.
5		No	Replace the wiring harness between the BCM and body ground, then go to the final step.
6	VERIFY TROUBLESHOOTING COMPLETED • Connect the BCM connector. • Connect the negative battery cable. • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Are DTCs U3003:16, U3003:17 displayed?	Yes	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
6		No	DTC troubleshooting completed.