B1273

SLIDING ROOF: SLIDING ROOF SYSTEM: B1273: Sliding Roof ECU Communication Stop

DTC B1273 - Sliding Roof ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the sliding roof drive gear sub-assembly and main body ECU stops for 10 seconds or more.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When using the Techstream with the ignition switch off to troubleshoot:

Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
HINT: DTC B2325 is stored when the communication between the sliding roof ECU and main body ECU stops.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF DRIVE GEAR)





(a) Disconnect the C45 ECU connector.
(b) Disconnect the J3 drive gear connector.
(c) Measure the resistance and voltage according to the value(s) in the tables below.
Standard Resistance:






Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY
(a) Temporarily replace the sliding roof drive gear sub-assembly with a new or normally functioning one .
NEXT -- Continue to next step.
3. CHECK DTC
(a) Clear the DTCs .
(b) Check the DTCs .

Result





B -- REPLACE MAIN BODY ECU
A -- END (SLIDING ROOF ECU IS DEFECTIVE)