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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 469 (Smart Access System (Keyless Start) (Diagnostic Codes & Symptom Tests)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) >> DTC U0100: Lost Communication with ECM; DTC U0140: Lost Communication with Main Body ECU; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter; DTC U0293: Lost Communication with HV ECU [08/2013 - ] >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • When using the Techstream with the vehicle power switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT: 

RELATED DATA LIST AND ACTIVE TEST ITEMS

DTC Data List Item Active Test Item
U0100
U0140
U0142
U0155
U0293
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