DTC B1318 [AUTO LIGHT/WIPER CONTROL MODULE]

id0902j1831000

DTC B1318

Battery voltage low

DETECTION CONDITION

Input voltage from the battery is excessively low

POSSIBLE CAUSE

•  Short to ground or open circuit in wiring harness between positive battery terminal and auto light/wiper control module terminal A

•  Open circuit in wiring harness between auto light/wiper control module terminal L and body ground

•  METER IG 15 A fuse malfunction

•  Battery malfunction

•  Generator malfunction

•  Auto light/wiper control module malfunction

DTC B1318	Battery voltage low
DETECTION CONDITION	Input voltage from the battery is excessively low
POSSIBLE CAUSE	• Short to ground or open circuit in wiring harness between positive battery terminal and auto light/wiper control module terminal A • Open circuit in wiring harness between auto light/wiper control module terminal L and body ground • METER IG 15 A fuse malfunction • Battery malfunction • Generator malfunction • Auto light/wiper control module malfunction

Diagnostic Procedure

Step

Inspection

Action

1

BATTERY INSPECTION

•  Refer to the battery inspection and inspect the battery.
(See BATTERY INSPECTION [L8, LF, L5].)

(See BATTERY INSPECTION [MZR-CD (RF 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 [L8, LF, L5].)

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

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

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

2

FUSE INSPECTION

•  Switch the ignition to off.

•  Disconnect the negative battery cable.

•  Remove the METER IG 15 A fuse.

•  Is the fuse normal?

Yes

Go to the next step.

No

Replace the METER IG 15 A fuse, then go to the final step.

3

VERIFY WIRING HARNESS BETWEEN POSITIVE BATTERY TERMINAL AND AUTO LIGHT/WIPER CONTROL MODULE FOR OPEN CIRCUIT

•  Install the METER IG 15 A fuse.

•  Remove the glove compartment.
(See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)

•  Connect the negative battery cable.

•  Measure the voltage of the auto light/wiper control module terminal A.

•  Is the voltage between B+?

Yes

Go to the next step.

No

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

4

INSPECT WIRING HARNESS BETWEEN AUTO LIGHT/WIPER CONTROL MODULE AND BODY GROUND

•  Switch the ignition to off.

•  Disconnect the negative battery cable.

•  Disconnect the auto light/wiper control module connector.

•  Inspect the wiring harness between auto light/wiper control module terminal L and body ground.

―  Open circuit

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the wiring harness between the auto light/wiper control module and body ground, then go to the next step.

5

VERIFY TROUBLESHOOTING COMPLETED

•  Connect the negative battery cable.

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [AUTO LIGHT/WIPER CONTROL MODULE].)

•  Perform the auto light/wiper control module DTC inspection using the M-MDS.
(See DTC INSPECTION [AUTO LIGHT/WIPER CONTROL MODULE].)

•  Is DTC B1318 displayed?

Yes

Replace the auto light/wiper control module.

(See AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	BATTERY INSPECTION • Refer to the battery inspection and inspect the battery. (See BATTERY INSPECTION [L8, LF, L5].) (See BATTERY INSPECTION [MZR-CD (RF Turbo)].) • Is the battery normal?	Yes	Go to the next step.
1		No	Replace or charge the battery, then go to the final step. (See BATTERY REMOVAL/INSTALLATION [L8, LF, L5].) (See BATTERY REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].) (See BATTERY RECHARGING [L8, LF, L5].) (See BATTERY RECHARGING [MZR-CD (RF Turbo)].)
2	FUSE INSPECTION • Switch the ignition to off. • Disconnect the negative battery cable. • Remove the METER IG 15 A fuse. • Is the fuse normal?	Yes	Go to the next step.
2		No	Replace the METER IG 15 A fuse, then go to the final step.
3	VERIFY WIRING HARNESS BETWEEN POSITIVE BATTERY TERMINAL AND AUTO LIGHT/WIPER CONTROL MODULE FOR OPEN CIRCUIT • Install the METER IG 15 A fuse. • Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.) • Connect the negative battery cable. • Measure the voltage of the auto light/wiper control module terminal A. • Is the voltage between B+?	Yes	Go to the next step.
3		No	Repair the related wiring harness, then go to the final step.
4	INSPECT WIRING HARNESS BETWEEN AUTO LIGHT/WIPER CONTROL MODULE AND BODY GROUND • Switch the ignition to off. • Disconnect the negative battery cable. • Disconnect the auto light/wiper control module connector. • Inspect the wiring harness between auto light/wiper control module terminal L and body ground. ― Open circuit • Is the wiring harness normal?	Yes	Go to the next step.
4		No	Replace the wiring harness between the auto light/wiper control module and body ground, then go to the next step.
5	VERIFY TROUBLESHOOTING COMPLETED • Connect the negative battery cable. • Clear DTCs using the M-MDS. (See CLEARING DTC [AUTO LIGHT/WIPER CONTROL MODULE].) • Perform the auto light/wiper control module DTC inspection using the M-MDS. (See DTC INSPECTION [AUTO LIGHT/WIPER CONTROL MODULE].) • Is DTC B1318 displayed?	Yes	Replace the auto light/wiper control module. (See AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION.)
5		No	DTC troubleshooting completed.