DTC    B1273    Sliding Roof ECU Communication Stop

for Preparation Click here


DESCRIPTION

This DTC is output when LIN communication between the sliding roof drive gear sub-assembly and main body ECU (driver side junction block) stops for 10 seconds or more.

DTC Code
DTC Detection Condition
Trouble Area
B1273
No communication between sliding roof drive gear sub-assembly and main body ECU (driver side junction block) for 10 seconds or more
  1. Sliding roof drive gear sub-assembly
  2. Main body ECU (driver side junction block)
  3. Harness or connector

WIRING DIAGRAM


B171975E01


INSPECTION PROCEDURE

NOTICE:
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 tester and vehicle begins.

HINT:
DTC B2325 is also output when communication between the sliding roof drive gear and main body ECU (driver side junction block) stops.
1.CLEAR DTC
  1. Clear the DTC (Click here).


NEXT


2.CHECK FOR DTC
  1. Check for DTCs (Click here).

    Result 
    Result
    Proceed to
    DTC B1273 output reoccurs
    A
    DTC B1273 output does not reoccur
    B


B
USE SIMULATION METHOD TO CHECK (Click here)
A


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

B171976E02

  1. Disconnect the J2 main body ECU (driver side junction block) connector.

  1. Disconnect the W3 sliding roof drive gear sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    J2-10 (LIN2) - W3-3 (SPD)
    Always
    Below 1 Ω
    J2-10 (LIN2) or W3-3 (SPD) - Body ground
    Always
    10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR - BATTERY AND BODY GROUND)


    B163105E10
  1. Disconnect the W3 sliding roof drive gear sub-assembly connector.

  1. Measure the resistance and voltage according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    W3-8 (E) - Body ground
    Always
    Below 1 Ω

    Standard Voltage:
    Tester Connection
    Switch Condition
    Specified Condition
    W3-9 (IG) - Body ground
    Ignition switch ON
    11 to 14 V
    W3-10 (B) - Body ground
    Always
    11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY
  1. Temporarily replace the sliding roof drive gear sub-assembly with a new or normally functioning one (Click here).

  1. Clear the DTC (Click here).


NEXT


6.CHECK FOR DTC
  1. Check for DTCs (Click here).

    Result: 
    Result
    Proceed to
    DTC B1273 output does not reoccur
    A
    DTC B1273 output reoccurs
    B


B
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)
A

END (SLIDING ROOF DRIVE GEAR IS DEFECTIVE)