DTC U0140: Lost Communication With Body Control Module

DTC detecting condition: 

When no data was received from BIU for 5 seconds.

Trouble symptom: 

IGN off timer (mirror operation possible for approx. 45 seconds after IGN OFF) does not operate. The following functions do not operate.

• Automatic electric retraction function
• Front door step light illumination
• Mirror heater operation
• Remote control mirror switch light illumination
  NOTE: Perform the diagnosis for LAN system and BIU. Refer to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE . Refer to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .