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Home >> Lexus >> 2010 >> IS 250C Standard >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Retractable Hardtop (Diagnostic Codes (B2536-B256E) & Circuit Tests) >> Retractable Hardtop System >> DTC B2540: Abnormal Difference Between RH and LH Roof Drive Motor Pulse >> Description

DTC B2540: Abnormal Difference Between RH and LH Roof Drive Motor Pulse: Description

The sliding roof control ECU assembly controls the speed of the roof panels using pulse signals that are generated by the rotation of the sliding roof drive gear assembly RH (roof motor RH) and sliding roof drive gear assembly LH (roof motor LH).

DTC No. Detection Condition Trouble Area
B2540 Pulse count difference between the right and left roof motors is 200 pulses or more.
  • Wire harness or connector
  • Sliding roof control ECU assembly