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: Control system
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Mazda 6 Service Manual: Abs (abs/tcs) hu/cm inspection
1. Disconnect the negative battery cable.
2. Connect the SST between the ABS (ABS/TCS) HU/CM and harness
connector with the ignition switch off.
3. Attach the tester leads to the SST and inspect voltage referring
the table below.
Terminal Voltage Table (Reference)
(Engine is idling, and co ...