1. Connect the connector to the running light unit.
2. Connect the negative battery cable.
3. Measure the voltage at the running light unit using voltmeter.
4. If the value are not as specified in the Terminal Voltage List (Reference), inspect the parts under Action and related wiring harnesses.
5. If the system does not work properly even though the parts or related wiring harnesses do not have any malfunction, replace the running light unit.
Terminal Voltage List (Reference)



Running light unit removal/installationMazda 6 Service Manual: Manual transaxle removal/installation
1. Remove the battery, battery tray and battery bracket.
2. Remove the air cleaner compornent. (See INTAKE-AIR SYSTEM
REMOVAL/INSTALLATION.)
3. Remove the wheels, tires and splash shields.
4. Remove the under cover.
5. Remove the steering gear and power steering pipe. (See STEERING GEAR AND
...
Mazda 6 Service Manual: Airflow mode actuator inspection
1. Connect battery positive voltage to terminal D or F and ground to terminal
F or D of the airflow mode actuator.
2. Verify that the airflow mode actuator operates as shown below.
If not as specified, replace the airflow mode actuator.
3. Verify that the resistance between the ter ...