P1572
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P1572 is displayed with DTC P0A1D, P31F7, P31FB, P31F8, P31FC or P31FD, perform the trouble diagnosis for DTC P0A1D, P31F7, P31FB, P31F8, P31FC or P31FD. Testing and Inspection .
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.
2. PERFORM COMPONENT FUNCTION CHECK
Perform component function check. .
NOTE:
Use component function check to check the overall function of the brake switch circuit. During this check, a
DTC might not to be confirmed.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to .
Component Function Check
1. PERFORM COMPONENT FUNCTION CHECK
With CONSULT
1.Turn ignition switch ON.
2.Select "ASCD BRAKE SW" in "DATA MONITOR" mode of "EV/HEV" using CONSULT.
3.Check that monitor indication as per the following condition.
Without CONSULT
1.Turn ignition switch ON.
2.Check the voltage HPCM harness connector terminals as per the following condition.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to .
Diagnosis Procedure
1. INSPECTION START
Check which type the vehicle is equipped with.
Which type?
Without ICC models-GO TO 2.
With ICC models-GO TO 6.
2. CHECK BRAKE SWITCH CIRCUIT
With CONSULT
1.Turn ignition switch ON.
2.Select "ASCD BRAKE SW" in "DATA MONITOR" mode of "EV/HEV" using CONSULT.
3.Check that monitor indication as per the following condition.
Without CONSULT
1.Turn ignition switch ON.
2.Check the voltage HPCM harness connector terminals as per the following condition.
Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- GO TO 3.
3. CHECK BRAKE SWITCH POWER SUPPLY
1.Turn ignition switch OFF.
2.Disconnect brake switch harness connector.
3.Turn ignition switch ON.
4.Check the voltage between brake switch harness connector and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- Perform the trouble diagnosis for power supply circuit.
4. CHECK BRAKE SWITCH INPUT SIGNAL CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect HPCM harness connector.
3.Check the continuity between brake switch harness connector and HPCM harness connector.
4.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.
5. CHECK BRAKE SWITCH
Check brake switch. .
Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- Replace brake switch. Removal and Installation.
6. CHECK DTC WITH ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT
Check DTC with electrically-driven intelligent brake unit. Scan Tool Testing and Procedures.
Is the inspection result normal?
YES- GO TO 7.
NO- Perform diagnosis procedure corresponding to DTC indicated. Testing and Inspection.
7. CHECK BRAKE SWITCH CIRCUIT
With CONSULT
1.Turn ignition switch ON.
2.Select "ASCD BRAKE SW" in "DATA MONITOR" mode of "EV/HEV" using CONSULT.
3.Check that monitor indication as per the following condition.
Without CONSULT
1.Turn ignition switch ON.
2.Check the voltage HPCM harness connector terminals as per the following condition.
Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- GO TO 8.
8. CHECK BRAKE SWITCH POWER SUPPLY
1.Turn ignition switch OFF.
2.Disconnect brake switch harness connector.
3.Turn ignition switch ON.
4.Check the voltage between brake switch harness connector and ground.
Is the inspection result normal?
YES- GO TO 9.
NO- Perform the trouble diagnosis for power supply circuit.
9. CHECK STOP LAMP OFF RELAY 1
Check stop lamp OFF relay 1. .
Is the inspection result normal?
YES- GO TO 10.
NO- Replace stop lamp OFF relay 1.
10. CHECK STOP LAMP OFF RELAY 2
Check stop lamp OFF relay 2. .
Is the inspection result normal?
YES- GO TO 11.
NO- Replace stop lamp OFF relay 2.
11. CHECK BRAKE SWITCH INPUT SIGNAL CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect HPCM harness connector.
3.Check the continuity between brake switch harness connector and HPCM harness connector.
4.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 12.
NO- Repair or replace error-detected parts.
12. CHECK BRAKE SWITCH
Check brake switch. .
Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- Replace brake switch. Removal and Installation.
Component Inspection (Brake Switch)
1. CHECK BRAKE SWITCH-1
1.Turn ignition switch OFF.
2.Disconnect brake switch harness connector.
3.Check the continuity between brake switch terminals as per the following condition.
Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 2.
2. CHECK BRAKE SWITCH-2
1.Adjust brake switch installation. Adjustments.
2.Check the continuity between brake switch terminals as per the following condition.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace brake switch. Removal and Installation.
Component Inspection (Stop Lamp OFF Relay 1)
1. CHECK STOP LAMP OFF RELAY 1
1.Turn ignition switch OFF.
2.Remove stop lamp OFF relay 1.
3.Check the continuity between stop lamp OFF relay 1 terminals as per the following condition.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace stop lamp OFF relay 1.
Component Inspection (Stop Lamp OFF Relay 2)
1. CHECK STOP LAMP OFF RELAY 2
1.Turn ignition switch OFF.
2.Remove stop lamp OFF relay 2.
3.Check the continuity between stop lamp OFF relay 2 terminals as per the following condition.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace stop lamp OFF relay 2.