DTC U2030: [Auto Light/Wiper Control Module]

DTC U2030 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U2030	Rain sensor communication fault
DETECTION CONDITION	Communication error to rain sensor
POSSIBLE CAUSE	Rain sensor connector malfunction Auto light/wiper control module connector malfunction Open circuit in wiring harness between auto light/wiper control module terminal 2E and rain sensor terminal C Short to GND in wiring harness between auto light/wiper control module terminal 2E and rain sensor terminal C Short to power supply in wiring harness between auto light/wiper control module terminal 2E and rain sensor terminal C Rain sensor malfunction Auto light/wiper control module malfunction
Courtesy of MAZDA MOTORS CORP.

DTC U2030 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT RAIN SENSOR CONNECTOR Turn the ignition switch off. Disconnect the negative battery cable. Disconnect the rain sensor connector. Inspect the rain sensor connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion.) Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 6.
1		No	Go to the next step.
2	INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR Disconnect the auto light/wiper control module connector. Inspect the auto light/wiper control module connector terminal for poor connection (such as damaged/pulled-out pins, and corrosion.) Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 6.
2		No	Go to the next step.
3	INSPECT RAIN SENSOR CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between auto light/wiper control module terminal 2E (wiring harness-side) and rain sensor terminal C (wiring harness-side.) Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 6.
4	INSPECT RAIN SENSOR SIGNAL CIRCUIT FOR SHORT TO GND Inspect for continuity between auto light/wiper control module terminal 2E (wiring harness-side) and body GND. Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to GND, then go to Step 6.
4		No	Go to the next step.
5	INSPECT RAIN SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY Connect the negative battery cable. Turn the ignition switch to the ON position (Engine off.) Measure the voltage at auto light/wiper control module terminal 2E (wiring harness-side.) Can the voltage be measured?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
5		No	Replace the Rain sensor, then go to the next step. (Refer to RAIN SENSOR REMOVAL/INSTALLATION .)
6	VERIFY DTC Turn the ignition switch off. Disconnect the negative battery cable. Reconnect the disconnected connectors. Connect the negative battery cable. Clear DTCs using the M-MDS. (Refer to CLEARING DTC [AUTO LIGHT/WIPER CONTROL MODULE] .) Perform the auto light/wiper control module DTC inspection using the M-MDS. (Refer to DTC INSPECTION [AUTO LIGHT/WIPER CONTROL MODULE] .) Is DTC U2030 displayed?	Yes	Replace the auto light/wiper control module, then go to the next step. (Refer to AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION .)
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT Are there other DTCs output?	Yes	Perform the corresponding DTC inspection. (Refer to DTC TABLE [AUTO LIGHT/WIPER CONTROL MODULE] .)
7		No	DTC troubleshooting completed.