B1273
MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: B1273: Sliding Roof ECU Communication Stop
DTC B1273 - Sliding Roof ECU Communication Stop
DESCRIPTION
This DTC is output when the LIN communication between the sliding roof drive gear 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 tester and vehicle begins.
HINT: DTC B2325 is also output when the communication between the sliding roof drive gear and main body ECU stops.
PROCEDURE
1. CLEAR DTC
(a) Clear the DTC (Reading and Clearing Diagnostic Trouble Codes).
NEXT -- Continue to next step.
2. CHECK FOR DTC
(a) Check for DTC (Reading and Clearing Diagnostic Trouble Codes).
Result:
B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF DRIVE GEAR)
(a) Disconnect the J2 ECU connector.
(b) Disconnect the W3 gear connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR - BATTERY AND BODY GROUND)
(a) Disconnect the W3 gear connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard resistance:
Standard voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY
(a) Temporarily replace the sliding roof drive gear with a new or normally functioning one (Service and Repair).
(b) Clear the DTC (Reading and Clearing Diagnostic Trouble Codes).
NEXT -- Continue to next step.
6. CHECK FOR DTC
(a) Check for DTC (Reading and Clearing Diagnostic Trouble Codes).
Result:
B -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)
A -- END (SLIDING ROOF DRIVE GEAR IS DEFECTIVE)