Toyota CH-R Service Manual: Lost Communication with Blind Spot Monitor Slave Module (U0232)

Toyota CH-R Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / Lost Communication with Blind Spot Monitor Slave Module (U0232)

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0232	Lost Communication with Blind Spot Monitor Slave Module	The blind spot monitor sensor LH (Master) cannot receive signals from the blind spot monitor sensor RH (Slave).	Open or short in CAN bus main wire or connector Blind spot monitor sensor RH (Slave) Power source circuit of blind spot monitor sensor RH (Slave) Blind spot monitor sensor RH (Slave) ground circuit Blind spot monitor sensor LH (Master)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is on.
Inspect the fuses for circuits related to this system before performing the following inspection 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.
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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 CAN BUS MAIN WIRE

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

Component with harness connected

(Blind Spot Monitor Sensor LH (Master))

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
M62-1 (CA2P) -M62-6 (CA2N)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
M62-1 (CA2P) -M62-6 (CA2N)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	70 Ω or more: Open circuit in main bus lines
M62-1(CA2P) - F41-4(CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CA2P short to ground
M62-6(CA2N) - F41-4(CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CA2N short to ground
M62-1(CA2P) - F41-16(BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CA2P +B short
M62-6(CA2N) - F41-16(BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CA2N +B short

Result	Proceed to
OK	A
Open circuit in CAN main bus lines	B
Short circuit between bus lines	C
Short to ground +B short	D

GO TO STEP 6

GO TO STEP 8

GO TO STEP 10

2.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (SLAVE) - BODY GROUND)

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M63-10 (BRGD) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH (SLAVE) POWER SOURCE)

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

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
M63-5 (BRB) - Body ground	Ignition switch to ON	11 to 14 V
M63-5 (BRB) - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK DTC

(a) Turn the ignition switch off.

(b) Turn the ignition switch on (IG).

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Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

USE SIMULATION METHOD TO CHECK

5.	REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

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

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(b) Clear the DTCs.

Click here

Body Electrical > Blind Spot Monitor Master > Clear DTCs

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Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

END (BLIND SPOT MONITOR SENSOR RH (SLAVE) WAS DEFECTIVE)

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M63-1 (CA2P) - M63-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

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

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

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

(a) Reconnect the blind spot monitor sensor RH (Slave) M63 connector.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M62-1 (CA2P) -M62-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

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

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (MASTER) - BLIND SPOT MONITOR SENSOR RH (SLAVE))

8.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (SLAVE))

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M63-1 (CA2P) - M63-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

9.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (MASTER))

(a) Reconnect the blind spot monitor sensor RH (Slave) M63 connector.

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M62-1 (CA2P) - M62-6 (CA2N)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (MASTER) - BLIND SPOT MONITOR SENSOR RH (SLAVE))

10.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH (SLAVE))

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

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH (Slave))

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M63-1 (CA2P) - F41-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
M63-6 (CA2N) - F41-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
M63-1 (CA2P) - F41-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
M63-6 (CA2N) - F41-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

11.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH (MASTER))

(a) Reconnect the blind spot monitor sensor RH (Slave) M63 connector.

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

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH (Slave))

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M62-1 (CA2P) - F41-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
M62-6 (CA2N) - F41-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
M62-1 (CA2P) - F41-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
M62-6 (CA2N) - F41-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH (MASTER) - BLIND SPOT MONITOR SENSOR RH (SLAVE))

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