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.

    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 CAN BUS MAIN WIRE

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

*a

Component with harness connected

(Blind Spot Monitor Sensor LH (Master))

*b

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

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
B

GO TO STEP 6

C

GO TO STEP 8

D

GO TO STEP 10

A

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK DTC

(a) Turn the ignition switch off.

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

(c) Check for DTCs.

Click here

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

5.

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

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

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Blind Spot Monitor Master > Clear DTCs

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

Click here

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

OK

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

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.

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

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))
OK

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

NG

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.

(c) Disconnect the blind spot monitor sensor LH (Master) connector.

(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))
OK

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

NG

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.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M63-1 (CA2P) - M63-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

NG

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))

(c) Disconnect the blind spot monitor sensor LH (Master) connector.

(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
OK

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

NG

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.

*a

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH (Slave))

*b

DLC3

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

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

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
OK

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

NG

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.

*a

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH (Slave))

*b

DLC3

(c) Disconnect the blind spot monitor sensor LH (Master) connector.

(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
OK

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

NG

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