B2325

NETWORKING: LIN COMMUNICATION SYSTEM: B2321, B2325; Lost Communication with Driver Door Power Window ECU; 2013 MY FR-S [03/2012 -]
B2321 - Lost Communication with Driver Door Power Window ECU
B2325 - LIN Communication Bus Malfunction

DESCRIPTION

B2321 is stored when the communication between the power window regulator master switch assembly and the main body ECU (network gateway computer) stops for 10 seconds or more.

The main body ECU (network gateway computer) monitors communication between all the ECUs connected to the door LIN bus. When the main body ECU (network gateway computer) detects errors in communication with all the ECUs connected to the door LIN bus at 2.6-second intervals and 3 times in a row, DTC B2325 will be stored.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When using the Techstream with the ignition switch off to troubleshoot:
Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
When communication between the power window regulator master switch assembly and the main body ECU (network gateway ECU) stops, DTC B2325 is also stored.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs 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 (NETWORK GATEWAY ECU) - POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY)

(a) Disconnect the D5 main body ECU (network gateway ECU) connector.

(b) Disconnect the E8 power window regulator master switch assembly connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)









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

Standard Resistance:





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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.

5. REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

(a) Temporarily replace the power window regulator master switch assembly with a new or normally functioning one Removal.

NEXT -- Continue to next step.

6. CLEAR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

7. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2321 or B2325 is not output.

NG -- REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) Removal

OK -- END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WAS DEFECTIVE)