B2128

B2128 UART COMMUNICATION LINE





Description
Driver seat control unit performs UART communication with the automatic drive positioner control unit using 1 communication line. Driver seat control unit receives the operation signals of ADP steering switch, door mirror remote control switch and the position signals of tilt sensor, telescopic sensor and door mirror sensors from the automatic drive positioner control unit and transmits the operation request signal.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1. STEP 1
Turn ignition switch ON.
- GO TO 2
2. PROCEDURE
Check "Self diagnostic result" with CONSULT-III.
Is the DTC detected?
YES - Perform diagnosis procedure. B2128.
NO - Inspection End.




Diagnosis Procedure
Regarding Wiring Diagram information, Driver Seat Control Unit.
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check "Self diagnostic result" with CONSULT-III.
3. Erase the DTC.
4. Perform DTC confirmation procedure. B2128.
Is the DTC displayed again?
YES - GO TO 2.
NO - Check intermittent incident. Intermittent Incident.
2. CHECK UART COMMUNICATION LINE CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and automatic drive positioner control unit.
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. Intermittent Incident.
NO - Repair or replace harness.