DTC B253B: Back Window Panel Lock Switch Abnormal Operation: Description

The back window lock assembly (roof rear lock switch) detects the lock/unlock state of the back window panel which changes according to sliding roof drive gear sub-assembly (roof rear lock motor) operation. The back window lock assembly (roof rear lock switch) sends this signal to the sliding roof control ECU assembly.

DTC No.	Detection Condition	Trouble Area
B253B	Output of roof rear lock switch does not change or change timing is abnormal.	Back window lock assembly (roof rear lock switch) Wire harness or connector Sliding roof control ECU assembly