INSPECTION PROCEDURE 1. INSPECT UNLOCK WARNING SWITCH ASSEMBLY 
(a) Measure the resistance according to the value(s) in the table below. Standard resistance:
If the result is not as specified, replace the unlock warning switch assembly. Text in Illustration
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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 ...
