Smart Key System (For Start Function) (Diagnostic Codes & Symptom Tests): Other Scion tC II

PROCEDURE

1. CHECK FOR WATER DAMAGE Check for any signs of water damage to the power source control ECU, surrounding parts, wire harnesses and connectors. RESULT Result Proceed to No signs of water damage A Signs of water damage B B --> TAKE MEASURES AGAINST CAUSE OF WATER DAMAGE AND REPLACE POWER SOURCE CONTROL ECU A --> See step 2
2. REPLACE POWER SOURCE CONTROL ECU. Refer to «REMOVAL»(ref-451224-S38850013962012020700000)

1. CHECK FOR DTC Record any output DTCs. Refer to «DTC CHECK / CLEAR»(ref-451056-S40407541942012020700000) . NOTE: When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. The smart key system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-451206-S04065401132012020700000) . NEXT --> See step 2
2. GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-451206-S04065401132012020700000)

1. CHECK DTC (ALL) See step 1 NG --> GO TO DTC CHART OK: Go to next step
2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY) See step 3 NG --> REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) See step 4 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK POWER SOURCE CONTROL ECU See step 5 NG --> See step 6 OK --> See step 5
5. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-451050-S39599463712012020700000)
6. REPLACE POWER SOURCE CONTROL ECU. Refer to «REMOVAL»(ref-451224-S38850013962012020700000)