DTC B1318 [Auto Light/Wiper Control Module]

DESCRIPTION

Low voltage of battery power supply

DETECTION CONDITION

Auto light/wiper control module power supply circuit voltage is excessively low.

POSSIBLE CAUSE

PCM DTC is stored
- Charging system malfunction
Auto light/wiper control module connector or terminals malfunction
Open circuit or short to ground in auto light/wiper control module power supply circuit
- Short to ground in wiring harness between auto light/wiper control module terminal A-Ignition switch terminal A⁽¹⁾/Relay block terminal 1B⁽²⁾
- METER 15 A fuse malfunction
- Open circuit in wiring harness between auto light/wiper control module terminal A-Ignition switch terminal A⁽¹⁾/Relay block terminal 1B⁽²⁾
Auto light/wiper control module malfunction

⁽¹⁾	Vehicles without advanced keyless entry and push button start system

⁽²⁾	Vehicles with advanced keyless entry and push button start system

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	CONFIRM PCM DTC Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [LF, L5] ). (See ON-BOARD DIAGNOSTIC TEST [L3 WITH TC] ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [LF, L5] ). (See DTC TABLE [L3 WITH TC] ).
1		No	Go to the next step.
2	INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR AND TERMINALS Switch the ignition to off. Disconnect the negative battery cable. Disconnect the auto light/wiper control module connector. Inspect for poor connection (damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 4.
2		No	Go to the next step.
3	INSPECT AUTO LIGHT/WIPER CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND Auto light/wiper control module connector is disconnected. Reconnect the negative battery cable. Switch the ignition to ON. Measure the voltage at the following terminal (wiring harness-side): Auto light/wiper control module terminal A Is the voltage B+ ?	Yes	Go to the next step.
3		No	Inspect the METER 15 A fuse. If the fuse is melt: Repair or replace the wiring harness for a possible short to ground. Replace the fuse. If the fuse is deterioration: Replace the fuse. If the fuse is normal: Repair or replace the wiring harness for a possible open circuit. Go to the next step.
4	VERIFY TROUBLESHOOTING COMPLETED Make sure to reconnect the disconnected connectors. Reconnect the negative battery cable. Clear the DTC from the auto light/wiper control module 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 the same DTC present?	Yes	Replace the auto light/wiper control module, then go to the next step. (See AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION ).
4		No	Go to the next step.
5	VERIFY THAT NO OTHER DTCs ARE RECORDED Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [AUTO LIGHT/WIPER CONTROL MODULE] ).
5		No	DTC troubleshooting completed.