Diagnostic Procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT RAIN SENSOR/AUTO LIGHT SENSOR CONNECTOR CONDITION 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 terminal, then go to Step 7.
1		No	Go to the next step.
2	INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR CONDITION 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 terminal, 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 Inspect for continuity between auto light/wiper control module terminal 2E (wiring harness-side) and body ground 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 Connect the negative battery cable. Switch the ignition to ON (engine off). Measure the voltage between auto light/wiper control module terminal 2E (wiring harness-side) and body ground 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 Switch the ignition to off. Disconnect the negative battery cable. Inspect for continuity between auto light/wiper control module terminal 2E (wiring harness-side) and rain sensor/auto light sensor terminal C (wiring harness-side). 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	PERFORM DTC INSPECTION Make sure to reconnect the disconnected connectors Reconnect the negative battery cable. Clear the DTC from the auto light/wiper control module memory 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 memory 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.