DTC U263B-16: Light Control Module (RH) Power Supply Circuit (IG+) Malfunction (BCM): Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC U263B:16 (BCM) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Light control module (RH) power supply circuit (IG+) malfunction
Detection condition	The light control module (RH) (built into front combination light (RH)) power supply circuit (IG+) voltage is lower than the standard.
Fail-safe	Not applicable
Possible cause	IG1 relay No. 2 malfunction and headlight relay malfunction Front combination light (RH) connector or terminal malfunction Short to ground in front combination light (RH) power supply circuit (IG+) Front combination light (RH) internal malfunction Body control module (BCM) malfunction
Courtesy of MAZDA MOTORS CORP.