B2128

B2128 UART COMMUNICATION LINE





Description
Driver seat control unit performs UART communication with the automatic drive positioner control unit using 2 communication lines, TX and RX line. Driver seat control unit receives the operation signals of tilt and telescopic switch, door mirror remote control switch, set switch and memory switch and the position signals of tilt and telescopic sensor and door mirror sensor from the automatic drive positioner control unit and transmits the operation request signal.




DTC Logic

DTC DETECTION LOGIC

DTC Detection Logic:

DTC CONFIRMATION PROCEDURE
1.PREFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Operate tilt and telescopic switch for more than 2 seconds.
3. Check "Self diagnostic result" with CONSULT-III.
Is the DTC detected?
YES - Perform diagnosis procedure. Refer to B2128.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK UART COMMUNICATION LINE CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and automatic drive positioner control unit connector.
3. Check continuity between driver seat control unit harness connector and automatic drive positioner control unit harness connector.





4. Check continuity between driver seat control unit harness connector and ground.





Is the inspection result normal?
YES - Check intermittent incident. Refer to Intermittent Incident.
NO - Repair or replace harness.