B1276

CAN COMMUNICATION SYSTEM: B1276: Power Mirror Control ECU Communication Stop

DTC B1276 - Power Mirror Control ECU Communication Stop

DESCRIPTION

The main body ECU will store this DTC when no signals can be received from the outer mirror control ECU while the CAN MS main bus is normal.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTICE:
- Turn the engine switch off before measuring the resistances 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
A -- Continue to next step.
2. CHECK CAN MS BUS WIRE (OUTER MIRROR CONTROL ECU)

(a) Turn the engine switch off.
(b) Disconnect connector E65 from the outer mirror control ECU.
(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 (OUTER MIRROR CONTROL ECU)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (ACC, GND)

(a) Disconnect connector E66 from the outer mirror control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE OUTER MIRROR CONTROL ECU