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: Front fender panel
FRONT FENDER PANEL REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Remove the front side turn light.
3. Remove the fender molding. (See COWL GRILLE REMOVAL/INSTALLATION.)
4. Remove the front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION.)
5. Remove the front combination light ...
Mazda 6 Service Manual: Relay inspection
Relay Type
Four-terminal
Type A
1. Remove the relay.
2. Inspect for continuity between the relay terminals using an ohmmeter.
If not as specified, replace the relay.
Type B
1. Remove the relay.
2. Inspect for continuity between the relay terminals using an ohmmeter.
If not as ...