B1289

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: B1289: Passenger Seat ECU Communication Stop
B1289 - Passenger Seat ECU Communication Stop

DESCRIPTION

The main body ECU will store this DTC when no signals can be received from the seat position control ECU (front RH side) while the CAN MS main bus is normal.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* Turn the engine switch off before measuring the resistance of CAN bus main wires and CAN bus branch wires.
* After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT
Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

PROCEDURE

1. CHECK DTC

(a) Check for DTCs.

HINT
If CAN MS bus communication error DTC B2326 is output, troubleshoot for B2326 and check for malfunctions in the CAN MS main bus circuit B2326.

Result:

B -- GO TO DTC CHART CAN Communication System
A -- Continue to next step.

2. CHECK CAN MS BUS WIRE (SEAT POSITION CONTROL ECU FOR FRONT RH SIDE)

(a) Turn the engine switch off.

(b) Disconnect connector T7 from the seat position control ECU for the front RH side.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (SEAT POSITION CONTROL ECU FOR FRONT RH SIDE)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (IG, GND)

(a) Disconnect connector T6 from the seat position control ECU for the front RH side.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SEAT POSITION CONTROL ECU (FRONT RH SIDE) Removal