03/02/2026
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Issue found:
Toyota Vios NSP151 displays โLANE DEPARTURE ALERT MALFUNCTIONโ on the meter.
Diagnosis result:
Diagnostic scan shows DTC C1AA9 โ Front Camera Module Beam Axis Not Adjusted.
Inspection & explanation:
The front camera module beam axis is out of specification or not calibrated correctly. As a result, the Lane Departure Alert system cannot determine lane markings accurately, triggering the
malfunction warning.
Solution:
Calibration was carried out according to specification.
The front camera beam axis was successfully calibrated, DTC C1AA9 was cleared, and the Lane Departure Alert system returned to normal operation.
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