DTC C1A03: Driving Support ECU Internal Logical Error; DTC C1A06: Stop Light Switch Input Circuit: Procedure

CHECK FOR DTC
1. Clear the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
2. Check for DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
  OK
  
  DTC C1A03 or C1A06 is not output.
NG → See step 2

OK → See step 3
REPLACE DRIVING SUPPORT ECU. Refer to REMOVAL [09/2012 - ]
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2012 - ]