Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message (U117787,U117887)

Toyota Corolla Cross (2022-2024) Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Parking Support Brake System / Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message (U117787,U117887)

DESCRIPTION

This DTC is output when the clearance warning ECU assembly detects lost communication with the blind spot monitor sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U117787

Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message

The clearance warning ECU assembly is unable to receive communication from the blind spot monitor sensor RH (A)

  • Open or short in CAN bus main wire or connector
  • Open or short in CAN bus wire or connector
  • Open or short in No. 1 CAN junction connector
  • Clearance warning ECU assembly
  • Blind spot monitor sensor RH (A)
  • Power source circuit of blind spot monitor sensor RH (A)
  • Blind spot monitor sensor RH (A) ground circuit
  • Blind spot monitor sensor LH (B)

U117887

Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message

The clearance warning ECU assembly is unable to receive communication from the blind spot monitor sensor LH (B)

  • Open or short in CAN bus main wire or connector
  • Open or short in CAN bus wire or connector
  • Open or short in No. 1 CAN junction connector
  • Clearance warning ECU assembly
  • Blind spot monitor sensor LH (B)
  • Power source circuit of blind spot monitor sensor LH (B)
  • Blind spot monitor sensor LH (B) ground circuit
  • Blind spot monitor sensor RH (A)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

HINT:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

Only U117787 is output

A

Only U117887 is output

B

U117787 and U117887 are output

C

None of the above conditions are met

D

B

GO TO STEP 5

C

GO TO STEP 7

D

USE SIMULATION METHOD TO CHECK

A

3.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - BATTERY AND BODY GROUND)

(a) Disconnect the S13 blind spot monitor sensor RH (A) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S13-10 (BRGD) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - BATTERY AND BODY GROUND)

(a) Disconnect the S13 blind spot monitor sensor RH (A) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S13-5 (BRB) - Body ground

Ignition switch ON

11 to 14 V

S13-5 (BRB) - Body ground

Ignition switch off

Below 1 V

OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - BATTERY AND BODY GROUND)

(a) Disconnect the S12 blind spot monitor sensor LH (B) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S12-10 (BLGD) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - BATTERY AND BODY GROUND)

(a) Disconnect the S12 blind spot monitor sensor LH (B) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S12-5 (BLB) - Body ground

Ignition switch ON

11 to 14 V

S12-5 (BLB) - Body ground

Ignition switch off

Below 1 V

OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK CAN BUS MAIN WIRE

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-10 (CANH) - I283-21 (CANL)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

I283-10 (CANH) - I283-21 (CANL)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

I283-10 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-21 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-10 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I283-21 (CANL) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

*a

Component with harness connected

(No. 4 CAN Junction Connector)

*b

Front view of DLC3

Result

Proceed to

I283-10 (CANH) - I283-21 (CANL) is more than or equal to 70 Ω

A

I283-10 (CANH) - I283-21 (CANL) is less than or equal to 54 Ω

B

I283-10 (CANH) - I26-4 (CG) is less than or equal to 200 Ω

C

I283-21 (CANL) - I26-4 (CG) is less than or equal to 200 Ω

D

I283-10 (CANH) - I26-16 (BAT) is less than or equal to 6 kΩ

E

I283-21 (CANL) - I26-16 (BAT) is less than or equal to 6 kΩ

F

None of the above conditions are met

G

B

GO TO STEP 14

C

GO TO STEP 20

D

GO TO STEP 20

E

GO TO STEP 20

F

GO TO STEP 20

G

GO TO STEP 26

A

8.

CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-11 (CANH) - I283-22 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

NG

GO TO STEP 13

OK

9.

CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-9 (CANH) - I283-20 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

NG

GO TO STEP 12

OK

10.

CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-10 (CANH) - I283-21 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR

NG

11.

CHECK FOR OPEN IN CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY)

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the I24 clearance warning ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-37 (CANH) - I24-38 (CANL)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

OK

REPLACE CLEARANCE WARNING ECU ASSEMBLY

NG

REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

12.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH (A))

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the S13 blind spot monitor sensor RH (A) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S13-1 (CA2P) - S13-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - NO. 4 CAN JUNCTION CONNECTOR)

13.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH (B))

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the S12 blind spot monitor sensor LH (B) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S12-1 (CA2P) - S12-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - NO. 4 CAN JUNCTION CONNECTOR)

14.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-11 (CANH) - I283-22 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

NG

GO TO STEP 19

OK

15.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-9 (CANH) - I283-20 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

NG

GO TO STEP 18

OK

16.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-10 (CANH) - I283-21 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR

NG

17.

CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the I24 clearance warning ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-37 (CANH) - I24-38 (CANL)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

OK

REPLACE CLEARANCE WARNING ECU ASSEMBLY

NG

REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

18.

CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (A))

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the S13 blind spot monitor sensor RH (A) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S13-1 (CA2P) - S13-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - NO. 4 CAN JUNCTION CONNECTOR)

19.

CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (B))

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the S12 blind spot monitor sensor LH (B) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S12-1 (CA2P) - S12-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - NO. 4 CAN JUNCTION CONNECTOR)

20.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-10 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-21 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-10 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I283-21 (CANL) - I26-16 (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.

NG

GO TO STEP 25

OK

21.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-9 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-20 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-9 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I283-20 (CANL) - I26-16 (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.

NG

GO TO STEP 24

OK

22.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Disconnect the I283 No. 4 CAN junction connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I283-11 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-22 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I283-11 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I283-22 (CANL) - I26-16 (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.

OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR

NG

23.

CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (B))

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the S12 blind spot monitor sensor LH (B) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S12-1 (CA2P) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

S12-6 (CA2N) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

S12-1 (CA2P) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

S12-6 (CA2N) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (B) - NO. 4 CAN JUNCTION CONNECTOR)

24.

CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (A))

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the S13 blind spot monitor sensor RH (A) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S13-1 (CA2P) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

S13-6 (CA2N) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

S13-1 (CA2P) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

S13-6 (CA2N) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) - NO. 4 CAN JUNCTION CONNECTOR)

25.

CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)

(a) Reconnect the I283 No. 4 CAN junction connector.

(b) Disconnect the I24 clearance warning ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I24-37 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I24-38 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

I24-37 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

I24-38 (CANL) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

OK

REPLACE CLEARANCE WARNING ECU ASSEMBLY

NG

REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

26.

CHECK CLEAR DTCS

(a) Using the GTS, clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

27.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

U117787 and U117887 are output

A

U117787 and U117887 are not output

B

A

REPLACE CLEARANCE WARNING ECU ASSEMBLY

B

GO TO PROBLEM SYMPTOM SIMULATION METHOD

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