DTC U2030 [Auto Light/Wiper Control Module]

DESCRIPTION	Rain sensor/auto light sensor communication fault
DETECTION CONDITION	Communication error between rain sensor/auto light sensor and auto light/wiper control module.
POSSIBLE CAUSE	Rain sensor/auto light sensor connector or terminals malfunction Auto light/wiper control module connector or terminals malfunction Short to ground in wiring harness between the following terminals: Rain sensor/auto light sensor terminal C-Auto light/wiper control module terminal U Short to power supply in wiring harness between the following terminals: Rain sensor/auto light sensor terminal C-Auto light/wiper control module terminal U Open circuit in wiring harness between the following terminals: Rain sensor/auto light sensor terminal C-Auto light/wiper control module terminal U Rain sensor/auto light sensor malfunction Auto light/wiper control module malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT RAIN SENSOR/AUTO LIGHT SENSOR CONNECTOR AND TERMINALS Switch the ignition to off. Disconnect the negative battery cable. Disconnect the rain sensor/auto light sensor connector. Inspect the rain sensor/auto light sensor connector for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
1		No	Go to the next step.
2	INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR AND TERMINALS Disconnect the auto light/wiper control module connector. Inspect the auto light/wiper control module connector for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
2		No	Go to the next step.
3	INSPECT RAIN SENSOR/AUTO LIGHT SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND Rain sensor/auto light sensor and auto light/wiper control module connectors are disconnected. Inspect for continuity between the following terminal (wiring harness-side) and body ground: Rain sensor/auto light sensor terminal C Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 7.
3		No	Go to the next step.
4	INSPECT RAIN SENSOR/AUTO LIGHT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY Rain sensor/auto light sensor and auto light/wiper control module connectors are disconnected. Reconnect the negative battery cable. Switch the ignition to ON. Measure the voltage at the following terminal (wiring harness-side): Rain sensor/auto light sensor terminal C Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 7.
4		No	Go to the next step.
5	INSPECT RAIN SENSOR/AUTO LIGHT SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT Rain sensor/auto light sensor and auto light/wiper control module connectors are disconnected. Switch the ignition to off. Disconnect the negative battery cable. Inspect for continuity between the following terminals (wiring harness-side): Rain sensor/auto light sensor terminal C-Auto light/wiper control module terminal U Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 7.
6	CONFIRM AUTO LIGHT/WIPER CONTROL MODULE DTC 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 rain sensor/auto light sensor, then go to the next step. (See RAIN SENSOR REMOVAL/INSTALLATION ).
6		No	Go to Step 8.
7	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 ).
7		No	Go to the next step.
8	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] ).
8		No	DTC troubleshooting completed.