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 > Lane Departure Alert System: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART LANE DEPARTURE ALERT SYSTEM DTC No. Detection Item Link C1A47 Steering Angle Sensor C1AA0 Front Camera Module Circuit C1AA1 FCM Destination Information Unmatched C1AA2 Vehicle Speed Tolerance Malfunction C1AA3 Vehicle Speed Sensor Circuit C1AA4 Yaw Rate Sensor Circuit C ...
