The daytime running unit is integrated in the BCM (A).
Check that the light operate according to the following timing chart.
If the condition of vehicles is Alternator level ON, turn Head Lamp Relay and Tail Lamp Relay ON.(DRL operation)
If Tail Switch is ON.
(turn Tail Lamp Relay and DRL Relay ON)
If the daytime running light is not operated well, Inspect the connector and terminals to be sure they are all making good contact.
If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
If the terminals look OK, go to step 4.
Make these input tests at the connector by using ETM.
If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, the I/P (Instrument panel) junction box must be faulty; replace it.