How To Proceed With Troubleshooting

DOOR LOCK: SMART KEY SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HINT
* Use the following procedures to troubleshoot the smart key system.
* The Techstream can be used in steps 4, 5, 6 and 8.
* When troubleshooting the smart key system using the Techstream with the power switch off, connect the Techstream to the vehicle and repeat turning any of the courtesy light switches on and off until communication between the tester and the vehicle begins (the interval between ON and OFF should be less than 1.5 sec.).
1. VEHICLE BROUGHT TO WORKSHOP

NEXT -- Continue to next step.

2. CUSTOMER PROBLEM ANALYSIS CHECK

HINT
* In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
* Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
* The following 5 items are important points in the problem analysis:






NEXT -- Continue to next step.

3. INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard voltage:

11 to 14 V

(b) If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

NEXT -- Continue to next step.

4. INSPECT CAN COMMUNICATION SYSTEM

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

5. INSPECT LIN COMMUNICATION SYSTEM

(a) Use the Techstream to check if the LIN communication system is functioning normally.

Result:





A -- GO TO LIN COMMUNICATION SYSTEM
B -- Continue to next step.

6. CHECK FOR DTC

(a) Check for DTCs. Based on the DTCs output, try to cause the same steering lock system DTC, engine immobiliser system DTC, wireless door lock control system DTC or smart key system (starting) DTC to be output by simulating the symptoms indicated by the DTCs.

Result:





A -- GO TO STEERING LOCK SYSTEM

B -- GO TO ENGINE IMMOBILISER SYSTEM

C -- GO TO WIRELESS DOOR LOCK CONTROL SYSTEM

D -- GO TO SMART KEY SYSTEM (STARTING)
E -- Continue to next step.

7. PROBLEM SYMPTOMS TABLE

Result:





B -- GO TO STEP 9
A -- Continue to next step.

8. OVERALL ANALYSIS AND TROUBLESHOOTING

(a) OPERATION CHECK Operation Check

(b) DATA LIST/ACTIVE TEST Door Lock - Smart Key System

(c) TERMINALS OF ECU Door Lock - Smart Key System

NEXT -- Continue to next step.

9. REPAIR OR REPLACE

NEXT -- Continue to next step.

10. CONFIRMATION TEST

NEXT -- END