PARK ASSIST / MONITORING: PARKING SUPPORT BRAKE SYSTEM: U117787,U117887; Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message; 2021 - 2024 MY Camry [10/2020

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM100000001RIGH
Model Year Start: 2021	Model: Camry	Prod Date Range: [10/2020 - ]
Title: PARK ASSIST / MONITORING: PARKING SUPPORT BRAKE SYSTEM: U117787,U117887; Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message; 2021 - 2024 MY Camry [10/2020 - ]

DTC

U117787

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

DTC

U117887

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

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	Memory
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 LH (A)	Open or short in bus main line Open or short in bus branch line Open or short in wire harness connector (No. 5 CAN junction connector) Clearance warning ECU assembly internal malfunction Blind spot monitor sensor LH (A) internal malfunction Blind spot monitor sensor LH (A) power source circuit malfunction Blind spot monitor sensor RH (B) internal malfunction	○
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 RH (B)	Open or short in bus main line Open or short in bus branch line Open or short in wire harness connector (No. 5 CAN junction connector) Clearance warning ECU assembly internal malfunction Blind spot monitor sensor RH (B) internal malfunction Blind spot monitor sensor RH (B) power source circuit malfunction Blind spot monitor sensor LH (A) internal malfunction	○

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.	CHECK FOR DTC

(a) Using the GTS, check for parking support brake system DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result	Proceed to
No DTCs are output	A
DTC U117787 only is output	B
DTC U117887 only is output	C
DTC U117787 and U117887 are output	D

USE SIMULATION METHOD TO CHECK

GO TO STEP 4

GO TO STEP 6

2.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH (A) - BODY GROUND)

(a) Disconnect the connector of the blind spot monitor sensor LH (A).

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH (A))

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
W6-10 (BLGD) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR LH (A) - POWER SOURCE)

(a) Disconnect the connector of the blind spot monitor sensor LH (A).

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH (A))

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
W6-5 (BLB) - Body ground	Ignition Switch ON	11 to 14 V
W6-5 (BLB) - Body ground	Ignition switch off	Below 1 V

REPLACE BLIND SPOT MONITOR SENSOR LH (A)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (B) - BODY GROUND)

(a) Disconnect the connector of the blind spot monitor sensor RH (B).

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH (B))

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
W5-10 (BRGD) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (B) - POWER SOURCE)

(a) Disconnect the connector of the blind spot monitor sensor RH (B).

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH (B))

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
W5-5 (BRB) - Body ground	Ignition switch ON	11 to 14 V
W5-5 (BRB) - Body ground	Ignition switch off	Below 1 V

REPLACE BLIND SPOT MONITOR SENSOR RH (B)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK CAN BUS (CONFIRM PROBLEM SYMPTOMS)

(a) Turn the ignition switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Problem Symptom if Specified Condition Not Met
R39-37 (CANH) - R39-38 (CANL)	Disconnect cable from negative (-) battery terminal	54 to 69 Ω	Below 54 Ω: Short in line
R39-37 (CANH) - R39-38 (CANL)	Disconnect cable from negative (-) battery terminal	54 to 69 Ω	70 Ω or higher: Open in main line
R39-37 (CANH) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: Short to ground
R39-38 (CANL) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: Short to ground
R39-37 (CANH) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: Short to +B
R39-38 (CANL) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: Short to +B

Component with wire harness connected

(Clearance Warning ECU Assembly)

DLC3

Result	Proceed to
OK	A
NG (open in main line)	B
NG (short in line)	C
NG (short to +B or ground)	D

GO TO STEP 9

GO TO STEP 13

GO TO STEP 17

7.	CLEAR DTCS

(a) Using the GTS, clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs

8.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result	Proceed to
DTC U117787 and U117887 are output	A
DTC U117787 and U117887 are not output	B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

GO TO PROBLEM SYMPTOM SIMULATION METHOD

9.	CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 5 CAN junction connector.

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

to Clearance Warning ECU Assembly CAN Wire

to Blind Spot Monitor Sensor RH (B) CAN Main Wire

to Blind Spot Monitor Sensor LH (A) CAN Main Wire

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R100-1 (CANH) - R100-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
R100-3 (CANH) - R100-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω
R100-2 (CANH) - R100-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result	Proceed to
OK	A
NG (to blind spot monitor sensor LH (A) CAN main wire)	B
NG (to blind spot monitor sensor RH (B) CAN main wire)	C
NG (to clearance warning ECU assembly CAN wire)	D

REPLACE NO. 5 CAN JUNCTION CONNECTOR

GO TO STEP 11

GO TO STEP 12

10.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH (A))

(a) Reconnect the R100 No. 5 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH (A))

(b) Disconnect the W6 blind spot monitor sensor LH (A) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W6-1 (CA2P) - W6-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR LH (A)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (A) - NO. 5 CAN JUNCTION CONNECTOR)

11.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH (B))

(a) Reconnect the R100 No. 5 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH (B))

(b) Disconnect the W5 blind spot monitor sensor RH (B) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W5-1 (CA2P) - W5-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR RH (B)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (B) - NO. 5 CAN JUNCTION CONNECTOR)

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

(a) Reconnect the No. 5 CAN junction connector.

*a	Front view of wire harness connector (to Clearance Warning ECU Assembly)

(b) Disconnect the R39 clearance warning ECU assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R39-37 (CANH) - R39-38 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

REPLACE CLEARANCE WARNING ECU ASSEMBLY

REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 5 CAN JUNCTION CONNECTOR)

13.	CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 5 CAN junction connector.

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

to Clearance Warning ECU Assembly CAN Wire

to Blind Spot Monitor Sensor RH (B) CAN Main Wire

to Blind Spot Monitor Sensor LH (A) CAN Main Wire

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R100-1 (CANH) - R100-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
R100-3 (CANH) - R100-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω
R100-2 (CANH) - R100-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result	Proceed to
OK	A
NG (to blind spot monitor sensor LH (A) CAN main wire)	B
NG (to blind spot monitor sensor RH (B) CAN main wire)	C
NG (to clearance warning ECU assembly CAN wire)	D

REPLACE NO. 5 CAN JUNCTION CONNECTOR

GO TO STEP 15

GO TO STEP 16

14.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (A))

(a) Reconnect the R100 No. 5 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH (A))

(b) Disconnect the W6 blind spot monitor sensor LH (A) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W6-1 (CA2P) - W6-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR LH (A)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (A) - NO. 5 CAN JUNCTION CONNECTOR)

15.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (B))

(a) Reconnect the R100 No. 5 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH (B))

(b) Disconnect the W5 blind spot monitor sensor RH (B) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W5-1 (CA2P) - W5-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR RH (B)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (B) - NO. 5 CAN JUNCTION CONNECTOR)

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

(a) Reconnect the No. 5 CAN junction connector.

*a	Front view of wire harness connector (to Clearance Warning ECU Assembly)

(b) Disconnect the R39 clearance warning ECU assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R39-37 (CANH) - R39-38 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

REPLACE CLEARANCE WARNING ECU ASSEMBLY

REPAIR OR REPLACE CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY - NO. 5 CAN JUNCTION CONNECTOR)

17.	CHECK FOR SHORT IN CAN BUS (BLIND SPOT MONITOR SENSOR LH (A) CONNECTION MAIN LINE)

(a) Disconnect the No. 5 CAN junction connector.

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R100-3 (CANH) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R100-14 (CANL) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R100-3 (CANH) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher
R100-14 (CANL) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher

HINT:

Check for short that was confirmed to be a malfunction by confirming symptoms.

GO TO STEP 22

18.	CHECK FOR SHORT IN CAN BUS (BLIND SPOT MONITOR SENSOR RH (B) CONNECTION MAIN LINE)

(a) Disconnect the No. 5 CAN junction connector.

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R100-2 (CANH) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R100-13 (CANL) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R100-2 (CANH) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher
R100-13 (CANL) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher

HINT:

Check for short that was confirmed to be a malfunction by confirming symptoms.

GO TO STEP 21

19.	CHECK FOR SHORT IN CAN BUS (CLEARANCE WARNING ECU ASSEMBLY CONNECTION BRANCH LINE)

(a) Reconnect the No. 5 CAN junction connector.

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R100-1 (CANH) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R100-12 (CANL) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R100-1 (CANH) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher
R100-12 (CANL) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher

HINT:

Check for short that was confirmed to be a malfunction by confirming symptoms.

REPLACE NO. 5 CAN JUNCTION CONNECTOR

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

(a) Reconnect the R100 No. 5 CAN junction connector.

Front view of wire harness connector

(to Clearance Warning ECU Assembly)

DLC3

(b) Disconnect the connector of the clearance warning ECU assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R39-37 (CANH) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R39-38 (CANL) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
R39-37 (CANH) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher
R39-38 (CANL) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher

REPLACE CLEARANCE WARNING ECU ASSEMBLY

REPAIR OR REPLACE CAN BUS BRANCH LINE OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 5 CAN JUNCTION CONNECTOR)

21.	CHECK FOR SHORT IN CAN BUS (BLIND SPOT MONITOR SENSOR RH (B))

(a) Reconnect the R100 No. 5 CAN junction connector.

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH (B))

DLC3

(b) Disconnect the connector of the blind spot monitor sensor RH (B).

Standard Resistance:

Tester Connection	Condition	Specified Condition
W5-1 (CA2P) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
W5-6 (CA2N) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
W5-1 (CA2P) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher
W5-6 (CA2N) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR RH (B)

REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH (B) - NO. 5 CAN JUNCTION CONNECTOR)

22.	CHECK FOR SHORT IN CAN BUS (BLIND SPOT MONITOR SENSOR LH (A))

(a) Reconnect the R100 No. 5 CAN junction connector.

Front view of wire harness connector

(to Blind Spot Monitor Sensor LH (A))

DLC3

(b) Disconnect the connector of the blind spot monitor sensor LH (A).

Standard Resistance:

Tester Connection	Condition	Specified Condition
W6-1 (CA2P) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
W6-6 (CA2N) - Body ground	Disconnect cable from negative (-) battery terminal	200 Ω or higher
W6-1 (CA2P) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher
W6-6 (CA2N) - K138-16 (BAT)	Disconnect cable from negative (-) battery terminal	6 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR LH (A)

REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (A) - NO. 5 CAN JUNCTION CONNECTOR)