DTC B1318 [AUTO LIGHT/WIPER CONTROL MODULE]

id0902j1831000

Description | Auto light/wiper control module power supply voltage low input
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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
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1 | VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) • 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. (See BATTERY INSPECTION [MZI-3.7].) • 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. (See GENERATOR INSPECTION [MZI-3.7].) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • 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. (See IGNITION SWITCH INSPECTION.) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • 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. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Clear the DTC for the auto light/wiper control module using the M-MDS. (See CLEARING DTC [AUTO LIGHT/WIPER CONTROL MODULE].) • Retrieve the auto light/wiper control module DTCs using the M-MDS. (See DTC INSPECTION [AUTO LIGHT/WIPER CONTROL MODULE].) • Is the same DTC displayed? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the auto light/wiper control module. (See AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION.) 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.