DTC U1177-87: Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message; DTC U1178-87: Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message [12/2021 - ]: Procedure
- CLEAR DTC
Result:
NEXT
See step 2
- CHECK FOR DTC
- Check for DTCs.
Body Electrical > Clearance Warning > Trouble Codes
Result
Result Proceed to DTCs are not output A Only U1177-87 is output B Only U1178-87 is output C U1177-87 and U1178-87 are output D
Result:
A
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - ]
Result:
C
See step 6
Result:
D
See step 9
Result:
B
See step 3
- Check for DTCs.
- CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - BATTERY AND BODY GROUND)
Pre-procedure1
- Disconnect the Q21 blind spot monitor sensor RH (A) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Q21-10 (BRGD) - Body ground Always Below 1 Ω - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition Q21-5 (BRB) - Body ground Ignition switch ON 11 to 14 V Q21-5 (BRB) - Body ground Ignition switch off Below 1 V Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 4
- Disconnect the Q21 blind spot monitor sensor RH (A) connector.
- CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH (A))
Pre-procedure1
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the Q21 blind spot monitor sensor RH (A) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Q21-1 (CA2P) - Q21-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR RH (A). Refer to REMOVAL [12/2021 - ]
Result:
NG
See step 5
- CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Reconnect the Q21 blind spot monitor sensor RH (A) connector.
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-10 (CANH) - I115-21 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE NO. 3 CAN JUNCTION CONNECTOR
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH [A] - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - BATTERY AND BODY GROUND)
Pre-procedure1
- Disconnect the T10 blind spot monitor sensor LH (B) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition T10-10 (BLGD) - Body ground Always Below 1 Ω Procedure1
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition T10-5 (BLB) - Body ground Ignition switch ON 11 to 14 V T10-5 (BLB) - Body ground Ignition switch off Below 1 V Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 7
- CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH (B))
Pre-procedure1
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the T10 blind spot monitor sensor LH (B) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition T10-1 (CA2P) - T10-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR LH (B). Refer to REMOVAL [12/2021 - ]
Result:
NG
See step 8
- CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Reconnect the T10 blind spot monitor sensor LH (B) connector.
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-11 (CANH) - I115-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE NO. 3 CAN JUNCTION CONNECTOR
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH [B] - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK CAN BUS MAIN WIRE
Pre-procedure1
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the I58 clearance warning ECU connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I58-37 (CANH) - I58-38 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω I58-37 (CANH) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I58-38 (CANL) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I58-37 (CANH) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher I58-38 (CANL) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Result
Result Proceed to I58-37 (CANH) - I58-38 (CANL) is more than or equal to 70 Ω A I58-37 (CANH) - I58-38 (CANL) is less than or equal to 54 Ω B I58-37 (CANH) - I76-4 (CG) is less than or equal to 200 Ω C I58-38 (CANL) - I76-4 (CG) is less than or equal to 200 Ω D I58-37 (CANH) - I76-16 (BAT) is less than or equal to 6 kΩ E I58-38 (CANL) - I76-16 (BAT) is less than or equal to 6 kΩ F None of the above conditions are met G Post-procedure1
- None
Result:
B
See step 15
Result:
C
See step 21
Result:
D
See step 21
Result:
E
See step 21
Result:
F
See step 21
Result:
G
REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to REMOVAL [12/2021 - ]
Result:
A
See step 10
- CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-11 (CANH) - I115-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 13
Result:
OK
See step 11
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-10 (CANH) - I115-21 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 14
Result:
OK
See step 12
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-9 (CANH) - I115-20 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)
Result:
NG
REPLACE NO. 3 CAN JUNCTION CONNECTOR
- Reconnect the I115 No. 3 CAN junction connector.
- CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH (B))
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the T10 blind spot monitor sensor LH (B) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition T10-1 (CA2P) - T10-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR LH (B). Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH (A))
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the Q21 blind spot monitor sensor RH (A) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Q21-1 (CA2P) - Q21-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR RH (A). Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-11 (CANH) - I115-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 18
Result:
OK
See step 16
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-10 (CANH) - I115-21 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 19
Result:
OK
See step 17
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-9 (CANH) - I115-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE NO. 3 CAN JUNCTION CONNECTOR
Result:
NG
See step 20
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (B))
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the T10 blind spot monitor sensor LH (B) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition T10-1 (CA2P) - T10-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR LH (B). Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (A))
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the Q21 blind spot monitor sensor RH (A) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Q21-1 (CA2P) - Q21-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR RH (A). Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the I58 clearance warning ECU connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I58-37 (CANH) - I58-38 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-11 (CANH) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I115-22 (CANL) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I115-11 (CANH) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher I115-22 (CANL) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher HINT:
Check for short that was confirmed to be a malfunction by confirming symptoms.
Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 24
Result:
OK
See step 22
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-10 (CANH) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I115-21 (CANL) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I115-10 (CANH) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher I115-21 (CANL) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher HINT:
Check for short that was confirmed to be a malfunction by confirming symptoms.
Result
Proceed to OK NG Post-procedure1
- None
Result:
NG
See step 25
Result:
OK
See step 23
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)
Pre-procedure1
- Disconnect the I115 No. 3 CAN junction connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I115-9 (CANH) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I115-20 (CANL) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I115-9 (CANH) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher I115-20 (CANL) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher HINT:
Check for short that was confirmed to be a malfunction by confirming symptoms.
Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE NO. 3 CAN JUNCTION CONNECTOR
Result:
NG
See step 26
- Disconnect the I115 No. 3 CAN junction connector.
- CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (B))
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the T10 blind spot monitor sensor LH (B) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition T10-1 (CA2P) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher T10-6 (CA2N) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher T10-1 (CA2P) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher T10-6 (CA2N) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR LH (B). Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (A))
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the Q21 blind spot monitor sensor RH (A) connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Q21-1 (CA2P) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Q21-6 (CA2N) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Q21-1 (CA2P) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Q21-6 (CA2N) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE BLIND SPOT MONITOR SENSOR RH (A). Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - NO. 3 CAN JUNCTION CONNECTOR)
- CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)
Pre-procedure1
- Reconnect the I115 No. 3 CAN junction connector.
- Disconnect the I58 clearance warning ECU connector.
Procedure1
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I58-37 (CANH) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I58-38 (CANL) - I76-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher I58-37 (CANH) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher I58-38 (CANL) - I76-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Result
Proceed to OK NG Post-procedure1
- None
Result:
OK
REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to REMOVAL [12/2021 - ]
Result:
NG
REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)