DTC B1318 [AUTO LIGHT/WIPER CONTROL MODULE]

id0902j1831000

Description

Auto light/wiper control module power supply voltage low input
Detection condition
•  Auto light/wiper control module power supply voltage from the battery is excessively low.
Possible cause
•  PCM DTC is stored.
•  Battery malfunction
•  Generator malfunction
•  Ignition switch connector or terminal malfunction
•  Auto light/wiper control module power supply circuit malfunction
―  Short to ground in wiring harness between the following terminals:
•  Battery positive terminal—Ignition switch terminal E
•  Battery positive terminal—Ignition switch terminal F
―  IGKEY1 30 A fuse malfunction
―  MAIN 150 A fuse malfunction
―  IGKEY2 40 A fuse malfunction
―  Open circuit in wiring harness between the following terminals:
•  Battery positive terminal—Ignition switch terminal E
•  Battery positive terminal—Ignition switch terminal F
•  Ignition switch malfunction
•  Auto light/wiper control module connector or terminal malfunction
•  Auto light/wiper control module power supply circuit malfunction
―  Short to ground in wiring harness between the following terminals:
•  Ignition switch terminal C—Auto light/wiper control module terminal 1B
•  Ignition switch terminal B—Auto light/wiper control module terminal 1E
―  C/U-IG1 15 A fuse malfunction
―  WIPER 30 A fuse malfunction
―  Open circuit in wiring harness between the following terminals:
•  Ignition switch terminal C—Auto light/wiper control module terminal 1B
•  Ignition switch terminal B—Auto light/wiper control module terminal 1E
•  Auto light/wiper control module malfunction

Diagnostic procedure

Step

Inspection

Action
1
VERIFY PCM DTCs
•  Retrieve the PCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [MZI-3.7].)
No
Go to the next step.
2
INSPECT BATTERY
•  Inspect the battery.
•  Is there any malfunction?
Yes
Recharge or replace the battery, then go to Step 9.
(See BATTERY RECHARGING [MZI-3.7].)
(See BATTERY REMOVAL/INSTALLATION [MZI-3.7].)
No
Go to the next step.
3
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Replace the generator, then go to Step 9.
(See GENERATOR REMOVAL/INSTALLATION [MZI-3.7].)
No
Go to the next step.
4
INSPECT IGNITION SWITCH CONNECTOR
•  Turn the ignition switch to the OFF position.
•  Disconnect the negative battery cable.
•  Disconnect the ignition switch connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is there any malfunction?
Yes
Repair or replace the connector, then go to Step 9.
No
Go to the next step.
5
VERIFY AUTO LIGHT/WIPER CONTROL MODULE POWER SUPPLY VOLTAGE
•  Verify that the ignition switch connector is disconnected.
•  Reconnect the negative battery cable.
•  Measure the voltage at the following terminals (wiring harness-side):
―  Ignition switch terminal E
―  Ignition switch terminal F
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the following fuses:
•  IGKEY1 30 A fuse
•  MAIN 150 A fuse
•  IGKEY2 40 A fuse
―  If a fuse is burnt out:
•  Repair or replace the wiring harness which has a short to ground.
•  Replace the fuse.
―  If a fuse is damaged:
•  Replace the damaged fuse.
―  If a fuse is normal:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 9.
6
INSPECT IGNITION SWITCH
•  Inspect the ignition switch.
•  Is there any malfunction?
Yes
Replace the ignition switch, then go to Step 9.
(See IGNITION SWITCH REMOVAL/INSTALLATION.)
No
Go to the next step.
7
INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR
•  Disconnect the negative battery cable.
•  Disconnect the auto light/wiper control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is there any malfunction?
Yes
Repair or replace the connector, then go to Step 9.
No
Go to the next step.
8
VERIFY AUTO LIGHT/WIPER CONTROL MODULE POWER SUPPLY VOLTAGE
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Measure the voltage at the following terminals (wiring harness-side):
―  Auto light/wiper control module terminal 1B
―  Auto light/wiper control module terminal 1E
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the C/U-IG1 15 A fuse and WIPER 30 A fuse.
•  If a fuse is burnt out:
―  Repair or replace the wiring harness which has a short to ground.
―  Replace the fuse.
•  If a fuse is damaged:
―  Replace the damaged fuse.
•  If a fuse is normal:
―  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
9
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the auto light/wiper control module using the M-MDS.
•  Retrieve the auto light/wiper control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the auto light/wiper control module.
Go to the next step.
No
Go to the next step.
10
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [AUTO LIGHT/WIPER CONTROL MODULE].)
No
DTC troubleshooting completed.