Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication with Side Obstacle Detection Control Module "A" Missing Message (U023287)

Toyota Corolla Cross (2022-2026) Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Blind Spot Monitor System / Lost Communication with Side Obstacle Detection Control Module "A" Missing Message (U023287)

DESCRIPTION

This DTC is stored when the blind spot monitor sensor LH (B) judges that there is a communication problem with the blind spot monitor sensor RH (A).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U023287

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

The blind spot monitor sensor LH (B) cannot receive signals from the blind spot monitor sensor RH (A)
  • Open or short in CAN bus main wire or connector
  • Open or short in No. 4 CAN junction connector
  • Blind spot monitor sensor LH (B)
  • Power source circuit of blind spot monitor sensor RH (A)
  • Blind spot monitor sensor RH (A) ground circuit
  • Blind spot monitor sensor RH (A)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor system is turned on.
  • 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 (-) auxiliary 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 (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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.

CHECK DTC OUTPUT (PARKING SUPPORT BRAKE SYSTEM)

(a) Using the GTS, check for DTCs according to the prompts on the screen.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

U117787 and U117887 are not output

A

U117787 and U117887 are output

B
B

GO TO PARKING SUPPORT BRAKE SYSTEM (DTC U117787)

A

2.

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

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

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω

I283-11 (CANH) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

I283-22 (CANL) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

I283-11 (CANH) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

I283-22 (CANL) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

Result:

Result

Proceed to

I283-11 (CANH) - I283-22 (CANL) is more than or equal to 70 Ω

A

I283-11 (CANH) - I283-22 (CANL) is less than or equal to 54 Ω

B

I283-11 (CANH) - Body ground is less than or equal to 200 Ω

C

I283-22 (CANL) - Body ground is less than or equal to 200 Ω

D

I283-11 (CANH) - +B is less than or equal to 6 kΩ

E

I283-22 (CANL) - +B is less than or equal to 6 kΩ

F

None of the above conditions are met

G

*a

Component with harness connected

(No. 4 CAN Junction Connector)

(d) Reconnect the cable to the negative (-) auxiliary battery terminal.

B

GO TO STEP 7

C

GO TO STEP 11

D

GO TO STEP 11

E

GO TO STEP 11

F

GO TO STEP 11

G

GO TO STEP 15

A

3.

CHECK FOR OPEN IN CAN BUS MAIN 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 (-) auxiliary battery terminal

108 to 132 Ω
NG

GO TO STEP 6

OK

4.

CHECK FOR OPEN IN CAN BUS MAIN 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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR
NG

5.

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

(a) Reconnect the I283 No. 1 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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

6.

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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

7.

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 (-) auxiliary battery terminal

108 to 132 Ω
NG

GO TO STEP 10

OK

8.

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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR
NG

9.

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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

10.

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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

11.

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) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

I283-22 (CANL) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

I283-11 (CANH) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

I283-22 (CANL) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher
NG

GO TO STEP 14

OK

12.

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) -Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

I283-20 (CANL) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

I283-9 (CANH) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

I283-20 (CANL) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher
OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR
NG

13.

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) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

S13-6 (CA2N) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

S13-1 (CA2P) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

S13-6 (CA2N) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher
OK

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

14.

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) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

S12-6 (CA2N) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

S12-1 (CA2P) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

S12-6 (CA2N) - +B

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher
OK

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

15.

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

16.

CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (A) POWER SOURCE)

(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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

CLEAR DTC

(a) Reconnect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Clear the DTCs.

Body Electrical > Blind Spot Monitor "B" > Clear DTCs
NEXT

18.

CHECK DTC

(a) Check for DTCs.

Body Electrical > Blind Spot Monitor "B" > Trouble Codes

OK:

No DTCs are output.

Result

Proceed to

DTCs are not output

A

U023287 is output

B

None of the above conditions are met

C
A

USE SIMULATION METHOD TO CHECK

C

GO TO DTC CHART
B

19.

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

(a) Replace the blind spot monitor sensor RH (A).

HINT:

Click here

NEXT

20.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Blind Spot Monitor "B" > Clear DTCs
NEXT

21.

RECHECK DTC

(a) Recheck for DTCs and check if the same DTC is output again.

Body Electrical > Blind Spot Monitor "B" > Trouble Codes

OK:

No DTCs are output.

Result

Proceed to

DTCs are not output

A

U023287 is output

B

None of the above conditions are met

C
A

END
B

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

C

GO TO DTC CHART

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