B126A

NETWORKING: LIN COMMUNICATION SYSTEM: B126A: Remote Engine Starter ECU Communication Stop
B126A - Remote Engine Starter ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) communicates with the accessory ECUs via BRAKES communication.

These DTCs are stored when communication between the main body ECU (multiplex network body ECU) and accessory ECU stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When using the Techstream to troubleshoot with the power switch off: Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
* Before starting repair, check that the power source system of the accessory ECU is not malfunctioning.
* When the main body ECU (multiplex network body ECU) is replaced with a new part and the cable is reconnected to the negative (-) auxiliary battery terminal, the power switch condition will be on (IG). Also, when the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the condition will be the same as it was before the cable was disconnected.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - OPTION CONNECTOR)

(a) Disconnect the I13 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the I89 option 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.

2. REPLACE OPTION CONNECTOR

(a) Replace the option connector.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT

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

(b) Recheck for DTCs.

OK:

DTC B126A is not output.

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

OK -- END (OPTION CONNECTOR ECU WAS DEFECTIVE)