There is a test procedure to make sure this is the cause here.I will post it below.You will need a multi meter and a test light to test this here.The MICU is part of the under dash fuse panel so you will need to access the wiring and connections to it.Here is the testing procedure for this here.
Exterior Lights MICU Input Test
NOTE: - The MICU turns on the headlights (high beams) in a dimming mode for the Daytime Running Lights under the following conditions: - With the ignition switch turned to ON (II). - The headlight switch OFF. - The parking brake is released (parking brake switch OFF). - The DRL indicator will come on when one of the headlight (high beams) bulbs is blown, or if the high beam wiring has an open circuit with the daytime running lights ON. - For Canada models: If the vehicle is equipped with an optional remote control engine start system, the daytime running lights will not function when started with the remote start.
1. Before testing the lighting system, troubleshoot the system using B-CAN System Diagnosis Test Mode A.(you can skip this test)
2. Check the No. 12 (10 A), No. 13 (10 A), No. 15 (7.5 A), No. 16 (10 A), No. 17 (10 A), No. 18 (20 A), No. 19 (15 A), and No. 21 (20 A), and No. 37 (7.5 A) fuses in the under-dash fuse/relay box. If any fuse is blown, replace it and go to step 3.
3. Disconnect under-dash fuse/relay box connectors E, F, G, S, and T. NOTE: All connector views are shown from wire side of female terminals.
4. Inspect the connector and socket 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 5.
5. With the connector still disconnected, do these input tests at the following connectors. - If any test indicates a problem, find and correct the cause, then recheck the system. - If all the input tests prove OK, go to step 6.
6. Reconnect the connectors to the under-dash fuse/relay box, and do these input tests at the following connectors. - If any test indicates a problem, find and correct the cause, then recheck the system. - If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box.
If you do not have the tools to test this here this will need done by someone that does have the correct test equipment.
Let me know if you need anything else and feel free to rate my help here.