PROCEDURE
(a) Enter the "Vehicle Signal Check Mode" screen. [Refer to Check Vehicle Signal in Operation Check (See page
![]() (b) Check that the display for "TAIL" changes between ON and OFF according to the light control switch operation. OK:
HINT: This display is updated once per second. As a result, it is normal for the display to lag behind the actual switch operation. Result
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Toyota Tundra Service Manual > Trailer Brake Control System: Power Supply Voltage Circuit (C1241)
DESCRIPTION If a malfunction is detected in the power supply circuit, the trailer brake control ECU (brake control with bracket relay) stores this DTC. DTC No. Detection Item INF Code DTC Detection Condition Trouble Area C1241 Power Supply Voltage Circuit 81 82 INF Code: 81 (Low power supply voltage ...