Pre-Collision System [diagnostic Codes & Circuit Tests] Toyota Prius V I

DESCRIPTION

The seat belt control ECU receives information from the driving support ECU assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

Scheme 24

INSPECTION PROCEDURE

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

Scheme 25

1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH Disconnect the S7 front seat outer belt assembly RH connector. HINT: Do not remove the front seat outer belt assembly RH. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition S7-1 (MOR+) - Body ground Power switch on (IG) Below 1 V S7-2 (MOR-) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *a Component without harness connected (Front Seat Outer Belt Assembly RH) WARNING: Do not check a wrong connector. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU) Disconnect the L2 seat belt control ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L2-1 (MOR-) - Body ground Power switch on (IG) Below 1 V L2-2 (MOR+) - Body ground Power switch on (IG) Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU) OK --> See step 3
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
4. REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information)

The seat belt control ECU receives information from the driving support ECU assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

PROCEDURE

1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH Disconnect the S7 front seat outer belt assembly RH connector. HINT: Do not remove the front seat outer belt assembly RH. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S7-1 (MOR+) - Body ground Always 1 Mohms or higher S7-2 (MOR-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Front Seat Outer Belt Assembly RH) WARNING: Do not check a wrong connector. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU) Disconnect the L2 seat belt control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L2-1 (MOR-) - Body ground Always 1 Mohms or higher L2-2 (MOR+) - Body ground Always 1 Mohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU) OK --> See step 3
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
4. REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information)

The seat belt control ECU receives information from the driving support ECU assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH Disconnect the S7 front seat outer belt assembly RH connector. HINT: Do not remove the front seat outer belt assembly RH. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S7-1 (MOR+) - S7-2 (MOR-) Always Below 20 ohms TEXT IN ILLUSTRATION *a Component without harness connected (Front Seat Outer Belt Assembly RH) WARNING: Do not check a wrong connector. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU) Disconnect the L2 seat belt control ECU connector. Using a service wire, connect 1 and 2 of the connector on the front seat outer belt assembly RH. NOTE: Do not forcibly insert the service wire into the terminals of the connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L2-1 (MOR-) - L2-2 (MOR+) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU) OK --> See step 3
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
4. REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information)

The seat belt control ECU receives information from the driving support ECU assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

Scheme 26

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

Scheme 27

1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY LH Disconnect the R8 front seat outer belt assembly LH connector. HINT: Do not remove the front seat outer belt assembly LH. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R8-1 (MOL+) - Body ground Power switch on (IG) Below 1 V R8-2 (MOL-) - Body ground Power switch on (IG) Below 1 V TEXT IN ILLUSTRATION *a Component without harness connected (Front Seat Outer Belt Assembly LH) WARNING: Do not check a wrong connector. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU) Disconnect the L2 seat belt control ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L2-3 (MOL+) - Body ground Power switch on (IG) Below 1 V L2-4 (MOL-) - Body ground Power switch on (IG) Below 1 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU) OK --> See step 3
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
4. REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information)

The seat belt control ECU receives information from the driving support EC assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY LH Disconnect the R8 front seat outer belt assembly LH connector. HINT: Do not remove the front seat outer belt assembly LH. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition R8-1 (MOL+) - Body ground Always 1 Mohms or higher R8-2 (MOL-) - Body ground Always 1 Mohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Front Seat Outer Belt Assembly LH) WARNING: Do not check a wrong connector. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU) Disconnect the L2 seat belt control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L2-3 (MOL+) - Body ground Always 1 Mohms or higher L2-4 (MOL-) - Body ground Always 1 Mohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU) OK --> See step 3
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
4. REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information)

The seat belt control ECU receives information from the driving support ECU assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

Note. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY LH Disconnect the R8 front seat outer belt assembly LH connector. HINT: Do not remove the front seat outer belt assembly LH. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition R8-1 (MOL+) - R8-2 (MOL-) Always Below 20 ohms TEXT IN ILLUSTRATION *a Component without harness connected (Front Seat Outer Belt Assembly LH) WARNING: Do not check a wrong connector. NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU) Disconnect the L2 seat belt control ECU connector. Using a service wire, connect 1 and 2 of the connector on the front seat outer belt assembly LH. NOTE: Do not forcibly insert the service wire into the terminals of the connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L2-3 (MOL+) - L2-4 (MOL-) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU) OK --> See step 3
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
4. REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#seat-belts-service-information)

The DTCs above are stored during seat belt control ECU self-diagnosis.

HINT

1. When DTC B2015 or B2016 is detected, DTCs B2026 and B2027 will not be detected.
2. When DTC B2020 or B2021 is detected, DTCs B2031 and B2032 will not be detected.

1. CHECK DTC OUTPUT Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Turn the power switch off. Turn the power switch on (IG). Recheck for DTCs. OK DTCs are not output. NG --> See step 3 OK --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)
3. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)

If the seat belt control ECU judges that there is a malfunction in its internal circuit as a result of self-diagnosis, or if the power source voltage (+B) is not input to the seat belt control ECU, this DTC will be stored.

Scheme 28

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

Scheme 29

1. INSPECT SEAT BELT CONTROL ECU (+B TERMINAL VOLTAGE) Disconnect the L2 seat belt control ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L2-7 (+B) - Body ground Power switch off 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Seat Belt Control ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT) OK --> See step 2
2. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)

This DTC is stored when a malfunction in the electronically controlled brake system is detected. This circuit consists of the brake booster with master cylinder (skid control ECU) and seat belt control ECU. Signals are sent from the brake booster with master cylinder (skid control ECU) using CAN communication.

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Clear the DTCs. Refer to «DIAGNOSIS SYSTEM»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction) . Recheck for DTCs. OK CAN communication system DTC is not output. NG --> See step 6 OK: Go to next step
2. CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) Check DTCs for the electronically controlled brake system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction) . OK Electronically controlled brake system DTC is not output. NG --> See step 4 OK: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle. Recheck for DTCs. OK DTC B2060 is not output. NG --> See step 5 OK --> See step 7
4. GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
6. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction)
7. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

The seat belt control ECU is connected to the main body ECU (multiplex network body ECU) using CAN communication.

The seat belt control ECU receives vehicle model information from the main body ECU (multiplex network body ECU) and determines whether the seat belt buckle switch information from the center airbag sensor assembly is for the driver seat or the passenger seat.

DTC B2064 is stored when CAN communication with the main body ECU (multiplex network body ECU) is normal and communication is available, but the steering wheel position information is not set or varies.

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Clear the DTCs. Refer to «DIAGNOSIS SYSTEM»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction) . Recheck for DTCs. OK CAN communication system DTC is not output. NG --> See step 7 OK: Go to next step
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC B2064 is not output. NG --> See step 3 OK --> See step 6
3. REPLACE MAIN BODY ECU Replace the main body ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/body-electrical/#power-distribution-service-information) . NEXT: Go to next step
4. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC B2064 is not output. NG --> See step 5 OK --> END (MAIN BODY ECU WAS DEFECTIVE)
5. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
6. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)
7. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction)

These DTCs are stored when a malfunction is detected in the driver side seat buckle switch circuit or passenger side seat buckle switch circuit.

Scheme 30

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Clear the DTCs. Refer to «DIAGNOSIS SYSTEM»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction) . Recheck for DTCs. OK CAN communication system DTC is not output. NG --> See step 5 OK: Go to next step
2. CHECK DTC OUTPUT (AIRBAG SYSTEM) Check DTCs for the airbag system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction) . OK Airbag system DTC is not output. NG --> See step 6 OK: Go to next step
3. CHECK DTC OUTPUT (OCCUPANT CLASSIFICATION SYSTEM) Check DTCs for the occupant classification system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__dtc-check-clear) . OK DTC B1771 is not output. NG --> See step 7 OK: Go to next step
4. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC B2074 or B2075 is not output. NG --> See step 8 OK --> See step 9
5. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction)
6. GO TO AIRBAG SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/airbag/#supplemental-restraint-system-diagnostics-introduction__diagnostic-trouble-code-chart)
7. GO TO OCCUPANT CLASSIFICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/airbag/#occupant-classification-system-diagnostics-introduction__diagnostic-trouble-code-chart)
8. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)
9. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

This DTC is stored when CAN communication between the driving support ECU assembly and brake booster with master cylinder (skid control ECU) is interrupted.

This circuit consists of the driving support ECU assembly, brake booster with master cylinder (skid control ECU) and seat belt control ECU. DTC B2085 is stored when the seat belt control ECU detects an interruption in CAN communication between the driving support ECU assembly and brake booster with master cylinder (skid control ECU).

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Clear the DTCs. Refer to «DIAGNOSIS SYSTEM»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction) . Check for DTCs. OK CAN communication system DTC is not output. NG --> See step 4 OK: Go to next step
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC B2085 is not output. NG --> See step 5 OK --> See step 3
3. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOMS SIMULATION). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)
4. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction)
5. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)

The seat belt control ECU receives collision information from the driving support ECU assembly and brake booster with master cylinder (skid control ECU) via CAN communication, and tightens the seat belts by operating the motor inside each front seat outer belt assembly.

When the driving support ECU assembly detects a malfunction in the dynamic radar cruise control system and pre-collision system, the malfunction information is sent to the seat belt control ECU, which stores this DTC.

When DTC B2090 is stored, other DTCs are also stored by the driving support ECU assembly (dynamic radar cruise control system and pre-collision system).

HINT

When clearing the DTCs, first clear the DTC output from the driving support ECU assembly (Pre-Collision 2), and then clear the DTC output from the seat belt control ECU.

1. CHECK DTC OUTPUT (DYNAMIC RADAR CRUISE CONTROL SYSTEM) Check DTCs for the dynamic radar cruise control system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#dynamic-radar-cruise-control-system-diagnostics-introduction__dtc-check-clear) . OK Dynamic radar cruise control system DTCs are not output. NG --> See step 4 OK: Go to next step
2. CHECK DTC OUTPUT (DRIVING SUPPORT ECU ASSEMBLY (PRE-COLLISION 2)) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Check for DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . OK "Pre-Collision 2" DTC is not output. NG --> See step 5 OK: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC B2090 is not output. NG --> See step 6 OK --> END
4. GO TO DYNAMIC RADAR CRUISE CONTROL SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#dynamic-radar-cruise-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__diagnostic-trouble-code-chart)
6. REPLACE SEAT BELT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)

The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly calculates the risk of a collision and operates the pre-collision system when it determines that the risk is high.

1. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A01 is not output. NG --> See step 2 OK --> See step 3
2. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)
3. CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction)

When a new driving support ECU assembly is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or AWD information, etc.) from the main body ECU and power management control ECU and memorizes the information.

DTC C1A02 is stored when the driving support ECU assembly receives the vehicle specification information from the main body ECU but cannot record it.

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DIAGNOSIS SYSTEM»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction) . Recheck for DTCs. OK CAN communication system DTC is not output. NG --> See step 3 OK --> See step 2
2. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)
3. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction)

The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly sends pre-collision control operation signals.

When the millimeter wave radar sensor is replaced with a new one, it acquires the country specification information from the driving support ECU assembly. Also, when the driving support ECU assembly is replaced with a new one, it receives country specification information from the main body ECU. When country specification information in the sensor, ECU and/or main body ECU do not match, DTC C1A0A is stored.

Note. When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed. Refer to ADJUSTMENT .

1. CHECK MILLIMETER WAVE RADAR SENSOR Using the Techstream, enter the following menus: Powertrain / Radar Cruise / Data List. RADAR CRUISE Tester Display Measurement Item/Range Normal Condition Diagnostic Note Country# (F Radar Sens) Millimeter wave radar sensor country signal/JPN, NA, EURO, AUS, SAFC, OTHER, TWN, CHINA, THAI, GCC, NOFIX Actual country code - Read the Data List and check the country specification information of the millimeter wave radar sensor and vehicle. RESULT Result Proceed to Country specification information for vehicle and millimeter wave radar sensor match A Country specification information for vehicle and millimeter wave radar sensor do not match B B --> See step 2 A --> See step 3
2. REPLACE MILLIMETER WAVE RADAR SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)
3. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly sends pre-collision control operation signals.

When the driving support ECU assembly receives information that there is a malfunction in the millimeter wave radar sensor, DTC C1A10 is stored.

Note. When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed. Refer to ADJUSTMENT .

1. REPLACE MILLIMETER WAVE RADAR SENSOR Replace the millimeter wave radar sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . NEXT: Go to next step
2. ADJUST MILLIMETER WAVE RADAR SENSOR Adjust the millimeter wave radar sensor. Refer to «ADJUSTMENT»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . NEXT: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A10 is not output. NG --> See step 4 OK --> END (MILLIMETER WAVE RADAR SENSOR WAS DEFECTIVE)
4. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU assembly sends pre-collision control operation signals.

When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the millimeter wave radar sensor performs self diagnosis to check if the sensor beam axis is deviated from the vehicle movement direction. When the millimeter wave radar sensor beam axis is deviated, the driving support ECU assembly detects this, and stores DTC C1A11.

After installing a new millimeter wave radar sensor, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.

Note. When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed. Refer to ADJUSTMENT .

1. ADJUST MILLIMETER WAVE RADAR SENSOR Check the millimeter wave radar sensor installation. Refer to «INSTALLATION»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . Adjust the millimeter wave radar sensor. Refer to «ADJUSTMENT»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . NEXT: Go to next step
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle. Recheck for DTCs. OK DTC C1A11 or C1A14 is not output. HINT: After performing the radar beam axis adjustment, if the same DTC is output again after the DTC detection conditions are met, replace the driving support ECU assembly. NG --> See step 3 OK --> END
3. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

When the driving support ECU assembly receives a hybrid control system or engine control system malfunction signal from the power management control ECU via the CAN communication system, DTC C1A40 is stored.

When DTC C1A40 is stored, hybrid control system or engine control system DTCs will also be stored.

1. CHECK DTC OUTPUT (HYBRID CONTROL SYSTEM) Check DTCs for the hybrid control system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/engine-control-systems/#hybrid-control-system-diagnostics-introduction) . OK Hybrid control system DTC is not output. NG --> See step 5 OK: Go to next step
2. CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM) Check DTCs for the engine control system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . OK Engine control system DTC is not output. NG --> See step 6 OK: Go to next step
3. REPLACE POWER MANAGEMENT CONTROL ECU Replace the power management control ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/body-electrical/#power-distribution-service-information) . NEXT: Go to next step
4. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A40 is not output. NG --> See step 7 OK --> END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)
5. GO TO HYBRID CONTROL SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/engine-control-systems/#hybrid-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
6. GO TO ENGINE CONTROL SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
7. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The brake booster with master cylinder (skid control ECU) receives brake control request signals from the power management control ECU and driving support ECU assembly.

When the request signals received from the power management control ECU and driving support ECU assembly are not consistent, the brake booster with master cylinder (skid control ECU) determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU assembly.

If the driving support ECU assembly receives a malfunction signal, DTC C1A41 is stored.

1. CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) Check DTCs for the electronically controlled brake system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction) . OK Electronically controlled brake system DTC is not output. NG --> See step 7 OK: Go to next step
2. CHECK DTC OUTPUT (HYBRID CONTROL SYSTEM) Check DTCs for the hybrid control system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/engine-control-systems/#hybrid-control-system-diagnostics-introduction) . OK Hybrid control system DTC is not output. NG --> See step 8 OK: Go to next step
3. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Replace the brake booster with master cylinder (skid control ECU). Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/mechanical-hydraulic/#brake-system-hydraulic-service-information) . NEXT: Go to next step
4. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A41 is not output. NG --> See step 5 OK --> END (BRAKE BOOSTER WITH MASTER CYLINDER WAS DEFECTIVE)
5. REPLACE POWER MANAGEMENT CONTROL ECU Replace the power management control ECU. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/body-electrical/#power-distribution-service-information) . NEXT: Go to next step
6. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A41 is not output. NG --> See step 9 OK --> END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)
7. GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction__diagnostic-trouble-code-chart)
8. GO TO HYBRID CONTROL SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/engine-control-systems/#hybrid-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
9. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The brake booster with master cylinder (skid control ECU) receives vehicle stability signals from the yaw rate sensor and sends the signals to the driving support ECU assembly and power management control ECU. If the brake booster with master cylinder (skid control ECU) detects that the yaw rate sensor is malfunctioning, the brake booster with master cylinder (skid control ECU) sends a malfunction signal to the driving support ECU assembly, and the driving support ECU assembly stores DTC C1A46. Also, when DTC C1A46 is stored, the brake booster with master cylinder (skid control ECU) stores DTC C1234 at the same time.

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) Check DTCs for the electronically controlled brake system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction) . OK DTC C1234 is not output. NG --> See step 4 OK: Go to next step
2. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Replace the brake booster with master cylinder (skid control ECU). Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/mechanical-hydraulic/#brake-system-hydraulic-service-information) . NEXT: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Driver the vehicle. Recheck for DTCs. OK DTC C1A46 is not output. NG --> See step 5 OK --> END (BRAKE BOOSTER WITH MASTER CYLINDER WAS DEFECTIVE)
4. GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The brake booster with master cylinder (skid control ECU) receives steering rotation angle information from the steering angle sensor, and sends the information to the driving support ECU assembly via CAN communication.

If the brake booster with master cylinder (skid control ECU) detects a malfunction of the steering angle sensor, it sends a malfunction signal to the driving support ECU assembly and stores a DTC.

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) Check DTCs for the electronically controlled brake system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction) . OK Electronically controlled brake system DTC is not output. NG --> See step 4 OK: Go to next step
2. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Replace the brake booster with master cylinder (skid control ECU). Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/mechanical-hydraulic/#brake-system-hydraulic-service-information) . NEXT: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle. Recheck for DTCs. OK DTC C1A47 is not output. NG --> See step 5 OK --> END (BRAKE BOOSTER WITH MASTER CYLINDER WAS DEFECTIVE)
4. GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

Based on pre-collision control, the driving support ECU assembly provides warnings to the driver. The driving support ECU assembly does this by sending a request signal to the brake booster with master cylinder (skid control ECU) to sound the skid control buzzer.

When the brake booster with master cylinder (skid control ECU) detects a malfunction in the VSC warning buzzer circuit, a malfunction signal is sent to the driving support ECU assembly, and this DTC is stored. Although the brake booster with master cylinder (skid control ECU) sends a malfunction signal to the driving support ECU assembly, the vehicle stability control system does not store a relevant malfunction detection DTC.

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER) Select the Active Test, use the Techstream to generate a control command, then check that the skid control buzzer sounds. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__data-list-active-test) . ABS/VSC/TRAC Tester Display Test Part Control Range Diagnostic Note DSS Signal Buzzer Skid control buzzer Buzzer ON/OFF Buzzer can be heard OK Skid control buzzer sounds. NG --> See step 4 OK: Go to next step
2. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Replace the brake booster with master cylinder (skid control ECU). Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/mechanical-hydraulic/#brake-system-hydraulic-service-information) . NEXT: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A4A is not output. NG --> See step 5 OK --> END (BRAKE BOOSTER WITH MASTER CYLINDER WAS DEFECTIVE)
4. GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction__how-to-proceed-with-troubleshooting)
5. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The stop light switch assembly sends a brake pedal operation signal to the driving support ECU assembly. Based on the signal, the driving support ECU assembly detects the operation of the brake pedal.

Note. When this DTC is output, malfunction in the electronically controlled brake system is suspected. Check if the electronically controlled brake system is functioning normally. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

HINT

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection.

1. CHECK DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) Check DTCs for the electronically controlled brake system. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction) . OK Electronically controlled brake system DTC is not output. NG --> See step 4 OK: Go to next step
2. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Replace the brake booster with master cylinder (skid control ECU). Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/mechanical-hydraulic/#brake-system-hydraulic-service-information) . NEXT: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Recheck for DTCs. OK DTC C1A4B is not output. NG --> See step 5 OK --> END (BRAKE BOOSTER WITH MASTER CYLINDER WAS DEFECTIVE)
4. GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/anti-locktraction-control/#electronically-controlled-brake-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

1. The driving support ECU assembly uses the millimeter wave radar sensor to detect obstacles in front of the vehicle. Based on this information, the driving support ECU assembly sends pre-collision control operation signals. These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.

1. The driving support ECU assembly sends vehicle speed and vehicle condition information to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly. The driving support ECU assembly sends this information to the ECM and performs pre-collision system operation (DTC U1104). DTC No. DTC Detection Condition Trouble Area U0122 When the power switch is on (IG), a communication error between the brake booster with master cylinder (skid control ECU) and the driving support ECU assembly is detected for approx. 3 seconds. When the power switch is on (IG), a communication error between the skid control ECU assembly and the seat belt control ECU is detected for approx. 3 seconds. CAN communication system Brake booster with master cylinder (skid control ECU) Driving support ECU assembly Seat belt control ECU Wire harness or connector U0123 When the power switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU assembly is detected for approx. 1 second. CAN communication system Yaw rate sensor Driving support ECU assembly Wire harness or connector U0126 When the power switch is on (IG), a communication error between the steering angle sensor and the driving support ECU assembly is detected for approx. 1 second. CAN communication system Steering angle sensor Driving support ECU assembly Wire harness or connector U0140 When the power switch is on (IG), communication stop between the main body ECU and seat belt control ECU continues for 6 seconds or more. CAN communication system Main body ECU (multiplex network body ECU) Seat belt control ECU Wire harness or connector U0151 When the power switch is on (IG), communication stop between the center airbag sensor and seat belt control ECU continues for 6 seconds or more. CAN communication system Center airbag sensor Seat belt control ECU Wire harness or connector U0293 When the power switch is on (IG), a communication error between the power management control ECU and brake booster with master cylinder (skid control ECU) is detected for approx. 1 second. When the power switch is on (IG), a communication error between the power management control ECU and driving support ECU assembly is detected for approx. 1 second. CAN communication system Power management control ECU Brake booster with master cylinder (skid control ECU) Driving support ECU assembly Wire harness or connector U1100 When the power switch is on (IG), a communication error between the seat belt control ECU and the driving support ECU assembly is detected for approx. 1 second. CAN communication system Driving support ECU assembly Seat belt control ECU Wire harness or connector U1104 When the power switch is on (IG), a communication error between the driving support ECU assembly and the millimeter wave radar sensor is detected for approx. 1 second. When the power switch is on (IG), a communication error between the driving support ECU assembly and the power management control ECU is detected for approx. 1 second. When the power switch is on (IG), a communication error between the driving support ECU assembly and seat belt control ECU is detected for approx. 1 second. CAN communication system Millimeter wave radar sensor Driving support ECU assembly Seat belt control ECU Wire harness or connector

Scheme 31

Note. When replacing the millimeter wave radar sensor with a new one, make sure to perform Adjust Millimeter Wave Radar Sensor Assembly. Refer to ADJUSTMENT . Confirm that the connector is securely connected, as a partially connected connector is suspected for the cause of these DTCs.

Scheme 32

Scheme 33

1. CHECK DTC OUTPUT Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Pre-Collision and Pre-Collision 2 / Trouble Codes. Check for DTCs. Result Result Proceed to DTC U1104 is output A DTC U1104 is not output B B --> See step 8 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DRIVING SUPPORT ECU) Disconnect the L60 driving support ECU assembly connector. Disconnect the A2 millimeter wave radar sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A2-4 (LRRD) - L60-38 (LRRD) Always Below 1 ohms L60-38 (LRRD) - Body ground Always 10 kohms or higher L60-25 (GND) - Body ground Always Below 1 ohms A2-2 (SGND) - Body ground Always Below 1 ohms Reconnect the L60 driving support ECU assembly connector. Reconnect the A2 millimeter wave radar sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR) OK: Go to next step
3. CHECK CAN COMMUNICATION SYSTEM Select "CAN Bus Check" from the "System Selection" on the Techstream. Select "Communication Malfunction DTC" from the "CAN Bus Check" screen, and then select "Enter". OK CAN communication is normal. NG --> See step 8 OK: Go to next step
4. CHECK DRIVING SUPPORT ECU ASSEMBLY (B CIRCUIT) Disconnect the A2 millimeter wave radar sensor connector. Disconnect the L60 driving support ECU assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L60-30 (B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Driving Support ECU) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (B CIRCUIT) OK: Go to next step
5. CHECK MILLIMETER WAVE RADAR SENSOR (IGB CIRCUIT) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A2-5 (IGB) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Millimeter Wave Radar Sensor) Reconnect the A2 millimeter wave radar sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGB CIRCUIT) OK: Go to next step
6. REPLACE MILLIMETER WAVE RADAR SENSOR Replace the millimeter wave radar sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . Adjust the millimeter wave radar sensor. Refer to «ADJUSTMENT»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . NEXT: Go to next step
7. CHECK DTC OUTPUT Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Turn the cruise control main switch on. Drive the vehicle at the required speed (45 km/h (28 mph) or higher). Check if the same DTC is output. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Result Result Proceed to DTC U1104 is not output A DTC U1104 is output B B --> See step 9 A --> END (MILLIMETER WAVE RADAR SENSOR WAS DEFECTIVE)
8. GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-v/i-2011-2014/remont/communication-devices/#can-communication-system-diagnostics-introduction)
9. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The driving support ECU assembly sends information on steering angle and steering direction to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly. The driving support ECU assembly sends this information to the power management control ECU and performs cruise control.

Note. When replacing the millimeter wave radar sensor with a new one, make sure to perform Adjust Millimeter Wave Radar Sensor Assembly. Refer to ADJUSTMENT . Confirm that the connector is securely connected, as a partially connected connector is suspected for the cause of this DTC.

Scheme 34

1. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DRIVING SUPPORT ECU ASSEMBLY) Disconnect the L60 driving support ECU assembly connector. Disconnect the A2 millimeter wave radar sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A2-3 (LRDD) - L60-16 (LRDD) Always Below 1 ohms A2-3 (LRDD) - Body ground Always 10 kohms or higher A2-4 (LRRD) - L60-38 (LRRD) Always Below 1 ohms A2-4 (LRRD) - Body ground Always 10 kohms or higher A2-2 (SGND) - Body ground Always Below 1 ohms L60-25 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR) OK: Go to next step
2. CHECK DRIVING SUPPORT ECU ASSEMBLY (B CIRCUIT) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L60-30 (B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Driving Support ECU Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (B CIRCUIT) OK: Go to next step
3. CHECK MILLIMETER WAVE RADAR SENSOR (IGB CIRCUIT) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A2-5 (IGB) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Millimeter Wave Radar Sensor) Reconnect the A2 millimeter wave radar sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGB CIRCUIT) OK: Go to next step
4. CHECK DRIVING SUPPORT ECU ASSEMBLY (LRDD OUTPUT VOLTAGE) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition L60-16 (LRDD) - Body ground Power switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Driving Support ECU Assembly) NG --> See step 7 OK: Go to next step
5. REPLACE DRIVING SUPPORT ECU Replace the driving support ECU assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information) . NEXT: Go to next step
6. CHECK DTC OUTPUT Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Turn the cruise control main switch on. Check if the same DTC is output. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__dtc-check-clear) . Result Result Proceed to DTC U0235 is not output A DTC U0235 is output B B --> See step 7 A --> END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)
7. REPLACE MILLIMETER WAVE RADAR SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)

The driving support ECU assembly receives a pre-collision brake on/off signal from the pre-collision system cancel switch assembly.

Scheme 35

Scheme 36

1. READ VALUE USING TECHSTREAM (PRE-COLLISION SYSTEM CANCEL SWITCH ASSEMBLY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Pre-Collision 2 / Data List. Read the display on the Techstream. PRE-COLLISION 2 Tester Display Measurement Item/Range Normal Condition Diagnostic Note Pre-Collision Brake OFF Switch Pre-collision system cancel switch assembly signal/ON or OFF ON: Pre-collision system cancel switch assembly on OFF: Pre-collision system cancel switch assembly off - OK On screen, each item changes between ON and OFF according to above chart. NG --> See step 2 OK --> See step 5
2. INSPECT PRE-COLLISION SYSTEM CANCEL SWITCH ASSEMBLY Remove the pre-collision system cancel switch assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - 2 Pressed Below 1 ohms Not pressed 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Pre-collision system cancel switch assembly) NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (PRE-COLLISION SYSTEM CANCEL SWITCH ASSEMBLY - DRIVING SUPPORT ECU ASSEMBLY, BODY GROUND) Disconnect the L60 driving support ECU assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition L108-1 - L60-5 (PBSW) Always Below 1 ohms L108-1 - Body ground Always 10 kohms or higher L108-2 - Body ground Always Below 1 ohms L60-25 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION SYSTEM CANCEL SWITCH - DRIVING SUPPORT ECU) OK --> See step 4
4. REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cruise-control-systems/#cruise-control-system-service-information)
5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__problem-symptoms-table)
6. REPLACE PRE-COLLISION SYSTEM CANCEL SWITCH ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-service-information)

This circuit supplies power to the seat belt control ECU.

Scheme 37

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 38

Scheme 39

1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note IG SW Power switch IG signal/ON or OFF ON: Power switch on (IG) OFF: Power switch off - OK Normal conditions listed above are displayed. NG --> See step 7 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (PGND CIRCUIT) Disconnect the L2 seat belt control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Display Condition Specified Condition L2-8 (PGND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Seat Belt Control ECU) Reconnect the L2 seat belt control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (IG1 CIRCUIT) Disconnect the L3 seat belt control ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Display Condition Specified Condition L3-8 (IG1) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Seat Belt Control ECU) Reconnect the L3 seat belt control ECU connector. NG --> See step 5 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (+B CIRCUIT) Disconnect the L2 seat belt control ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Display Condition Specified Condition L2-7 (+B) - Body ground Power switch off 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Seat Belt Control ECU) NG --> See step 5 OK --> See step 8
5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SEAT BELT CONTROL ECU) Disconnect the 2A and 2B instrument panel junction block assembly connectors. Disconnect the L3 seat belt control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-5 - L2-7 (+B) Always Below 1 ohms 2B-16 - L3-8 (IG1) Always Below 1 ohms L2-7 (+B) - Body ground Always 10 kohms or higher L3-8 (IG1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
6. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/body-electrical/#power-distribution-service-information)
7. GO TO LIGHTING SYSTEM. Refer to «IG Signal Circuit»(/toyota/prius-v/i-2011-2014/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests)
8. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-v/i-2011-2014/remont/restraints-control-systems/#pre-collision-system-diagnostics-introduction__problem-symptoms-table)

See also:
• PRECAUTION
• REMOVAL
• REMOVAL
• DTC CHECK / CLEAR
• DIAGNOSIS SYSTEM
• DTC CHECK / CLEAR
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• DTC CHECK / CLEAR
• DTC CHECK / CLEAR
• DIAGNOSTIC TROUBLE CODE CHART
• DIAGNOSTIC TROUBLE CODE CHART
• DTC CHECK / CLEAR
• DIAGNOSTIC TROUBLE CODE CHART
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• DTC CHECK / CLEAR
• DTC CHECK / CLEAR
• DIAGNOSTIC TROUBLE CODE CHART
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• DATA LIST / ACTIVE TEST
• HOW TO PROCEED WITH TROUBLESHOOTING
• PROBLEM SYMPTOMS TABLE
• IG Signal Circuit