PROCEDURE
(a) Replace the disc with a known good one and check that the malfunction disappears. OK: Malfunction disappears.
(a) Check that the radio and display receiver assembly is properly installed Result
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Toyota Tundra Service Manual > Trailer Brake Control System: Brake System Malfunction (C13A9)
DESCRIPTION This DTC is stored when a malfunction is detected in the vehicle stability control system. Check the vehicle stability control system when DTC C13A9 is stored. DTC No. Detection Item INF Code DTC Detection Condition Trouble Area C13A9 Brake System Malfunction - An oil pressure sensor or ...