B1541
DTC B1541: Back-Up Power Supply Circuit MalfunctionWiring Diagram:
Wiring Diagram
DTC Detecting Condition And Trouble Area:
DTC Detecting Condition and Trouble Area
NOTE: When checking DTC after connecting battery cable, be sure to turn ignition switch from OFF to ON and from ON to OFF at least once, or DTC B1541 will be detected.
Step 1-3:
DTC Troubleshooting