DTC B1003: ECU Malfunction [10/2020 - 11/2021]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.

   Body Electrical > Central Gateway > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1003 is not output from the central gateway ECU (network gateway ECU)	A
   DTC B1003 is output from the central gateway ECU (network gateway ECU)	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021] 

Result: 

B 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [10/2020 - 11/2021]