Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK SELF-DIAGNOSIS RESULTS 

   Check if "U1000" is detected other than "C1A13" in "Self Diagnostic Result" of "ICC/ADAS".

   Is "U1000" detected? 

   YES: Perform the CAN communication system inspection. Repair or replace the malfunctioning parts. Refer to "ADAS CONTROL UNIT: DTC Logic ".

   NO: GO TO  2.

2. CHECK STOP LAMP SWITCH 

   Check that "STOP LAMP SW" operate normally in "DATA MONITOR" of "ICC/ADAS".

   Is the inspection result normal? 

   YES: GO TO  10.

   NO: GO TO  3.

3. CHECK STOP LAMP SWITCH INSTALLATION 
   1. Turn ignition switch OFF.
   2. Check stop lamp switch for correct installation. Refer to "ADJUSTMENT ".

   Is the inspection result normal? 

   YES: GO TO  4.

   NO: Adjust stop lamp switch installation. Refer to "ADJUSTMENT ".

4. CHECK STOP LAMP SWITCH 
   1. Disconnect stop lamp switch connector.
   2. Check stop lamp switch. Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) ".

   Is the inspection result normal? 

   YES: GO TO  5.

   NO: Replace stop lamp switch.

5. CHECK STOP LAMP FOR ILLUMINATION 
   1. Turn the ignition switch OFF.
   2. Remove ICC brake hold relay.
   3. Check that the stop lamp is illuminated by depressing the brake pedal to turn the stop lamp ON.

   Is the inspection result normal? 

   YES: GO TO  6.

   NO: Check the stop lamp circuit, and repair or replace the malfunctioning parts.

6. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ECM 
   1. Turn the ignition switch OFF.
   2. Disconnect stop lamp switch, ECM, rear combination lamp, and high-mounted stop lamp connectors.
   3. Check for continuity between the stop lamp switch harness connector and the ECM harness connector.

      Stop lamp switch		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      E38	2	E16	122	Yes

   4. Check for continuity between stop lamp switch harness connector and ground.

      Stop lamp switch		Ground	Continuity
      Connector	Terminal
      E38	2		No

   Is the inspection result normal? 

   YES: GO TO  7.

   NO: Repair the harnesses or connectors.

7. CHECK ICC BRAKE HOLD RELAY CIRCUIT 
   1. Disconnect ECM, rear combination lamp, and high-mounted stop lamp connectors.
   2. Check that the stop lamp does not illuminate when brake pedal is not depressed.

   Is the inspection result normal? 

   YES: GO TO  9.

   NO: GO TO  8.

8. CHECK ICC BRAKE HOLD RELAY 
   1. Remove ICC brake hold relay
   2. Check ICC brake hold relay. Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: GO TO  9.

   NO: Replace ICC brake hold relay.

9. PERFORM SELF-DIAGNOSIS OF ECM 
   1. Connect all connectors again if the connectors are disconnected.
   2. Turn ignition switch ON.
   3. Perform "All DTC Reading".
   4. Check if any DTC is detected in "Self Diagnostic Result" of "ENGINE". Refer to "DTC INDEX ".

   Is any DTC detected? 

   YES: Repair or replace the malfunctioning parts identified by the self-diagnosis result.

   NO: Replace ADAS control unit. Refer to "REMOVAL AND INSTALLATION ".

10. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Remove ICC brake hold relay.
    3. Check the voltage between ICC brake hold relay harness connector and ground.

       Terminal			Voltage (Approx.)
       (+)		(-)
       ICC brake hold relay		Ground
       Connector	Terminal
       E75	2		Battery voltage

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: Repair or replace ICC brake hold relay power supply circuit.

11. CHECK HARNESS BETWEEN AND ICC BRAKE HOLD RELAY AND ADAS CONTROL UNIT 
    1. Disconnect ADAS control unit connectors.
    2. Check for continuity between ICC brake hold relay harness connector and ECM harness connector.

       ICC brake hold relay		ADAS control unit		Continuity
       Connector	Terminal	Connector	Terminal
       E75	1	B104	5	Yes

    3. Check for continuity between ADAS control unit harness connector and ground.

       ICC brake hold relay		Ground	Continuity
       Connector	Terminal
       E75	1		No

    Is the inspection result normal? 

    YES: GO TO  12.

    NO: Repair the harnesses or connectors.

12. CHECK ADAS CONTROL UNIT STANDARD VOLTAGE 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "STOP LAMP" on "Active Test" of "ICC/ADAS", and then check the voltage between ADAS control unit harness connector and ground.

       Terminal			Condition	Voltage (Approx.)
       (+)		(-)
       ADAS control unit		Ground	Active Test item "STOP LAMP"
       Connector	Terminal
       B104	5		Off	Battery voltage
       			On	0 V

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: Replace ADAS control unit. Refer to "REMOVAL AND INSTALLATION ".

13. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check the voltage between ICC brake hold relay harness connector and ground.

       Terminal			Voltage (Approx.)
       (+)		(-)
       ICC brake hold relay		Ground
       Connector	Terminal
       E75	5		Battery voltage

    Is the inspection result normal? 

    YES: GO TO  14.

    NO: Repair or replace ICC brake hold relay power supply circuit.

14. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ECM 
    1. Disconnect ECM, rear combination lamp, and high-mounted stop lamp connectors and remove ICC brake hold relay.
    2. Check for continuity between ICC brake hold relay harness connector and ECM harness connector.

       ICC brake hold relay		ECM		Continuity
       Connector	Terminal	Connector	Terminal
       E75	3	M16	122	Yes

    3. Check for continuity between ICC brake hold relay harness connector and ground.

       ICC brake hold relay		Ground	Continuity
       Connector	Terminal
       E75	3		No

    Is the inspection result normal? 

    YES: GO TO  15.

    NO: Repair the harnesses or connectors.

15. CHECK ICC BRAKE HOLD RELAY 
    1. Remove ICC brake hold relay.
    2. Check ICC brake hold relay. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  16.

    NO: Replace ICC brake hold relay.

16. CHECK STOP LAMP SWITCH 

    Check that "STOP LAMP SW" operate normally in "DATA MONITOR" of "ABS".

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: GO TO  17.

17. CHECK STOP LAMP SWITCH INSTALLATION 
    1. Turn ignition switch OFF.
    2. Check stop lamp switch for correct installation. Refer to "ADJUSTMENT ".

    Is the inspection result normal? 

    YES: GO TO  18.

    NO: Adjust stop lamp switch installation. Refer to "ADJUSTMENT ".

18. CHECK STOP LAMP SWITCH 
    1. Disconnect stop lamp switch connector.
    2. Check stop lamp switch. Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  19.

    NO: Replace stop lamp switch.

19. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Connect stop lamp switch connector.
    2. Check the voltage between stop lamp switch harness connector and ground.

       Terminal			Voltage (Approx.)
       (+)		(-)
       Stop lamp switch		Ground
       Connector	Terminal
       E38	3		Battery voltage

    Is the inspection result normal? 

    YES: GO TO  20.

    NO: Repair or replace stop lamp switch power supply circuit.

20. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Turn the ignition switch OFF.
    2. Disconnect stop lamp switch, ABS actuator and electric unit (control unit) connectors.
    3. Check for continuity between the stop lamp switch harness connector and the ABS actuator and electric unit (control unit) harness connector.

       Stop lamp switch		ABS actuator and electric unit (control unit)		Continuity
       Connector	Terminal	Connector	Terminal
       E38	4	E125	5	Yes

    4. Check for continuity between stop lamp switch harness connector and ground.

       Stop lamp switch		Ground	Continuity
       Connector	Terminal
       E38	4		No

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: Repair the harnesses or connectors.

21. PERFORM SELF-DIAGNOSIS OF ECM 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "All DTC Reading".
    4. Check if any DTC is detected in "Self Diagnostic Result" of "ENGINE". Refer to "DTC INDEX ".

    Is any DTC detected? 

    YES: Repair or replace the malfunctioning parts identified by the self-diagnosis result.

    NO: GO TO  22.

22. PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "All DTC Reading".
    4. Check if any DTC is detected in "Self Diagnostic Result" of "ABS". Refer to "DTC INDEX ".

    Is any DTC detected? 

    YES: Repair or replace the malfunctioning parts identified by the self-diagnosis result.

    NO: Replace ADAS control unit. Refer to "REMOVAL AND INSTALLATION ".