Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM100000001H940 |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [01/2019 - 09/2022] |
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for HV Model (w/o Safe Exit Assist Function)): U0232; Lost Communication with Blind Spot Monitor Slave Module; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] |
DTC
|
U0232
|
Lost Communication with Blind Spot Monitor Slave Module
|
DESCRIPTION
This DTC is stored when the blind spot monitor sensor LH judges that there is a communication problem with the blind spot monitor sensor RH.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
U0232
|
Lost Communication with Blind Spot Monitor Slave Module
|
The blind spot monitor sensor (master) cannot receive signals from the blind spot monitor sensor (slave)
|
-
Open or short in CAN bus main wire or connector
-
Open or short in No. 19 junction connector
-
Blind spot monitor sensor RH
-
Power source circuit of blind spot monitor sensor RH
-
Blind spot monitor sensor RH ground circuit
-
Blind spot monitor sensor LH
-
Harness or connector
|
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 power 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 power 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 power 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) Turn the power switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
Result
|
O57-1 (CA2P) - O57-6 (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
|
O57-1 (CA2P) - Body ground
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
Below 200 Ω: CA2P short to ground
|
O57-6 (CA2N) - Body ground
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
Below 200 Ω: CA2N short to ground
|
O57-1 (CA2P) - +B
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Below 6 kΩ: CA2P +B short
|
O57-6 (CA2N) - +B
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
Below 6 kΩ: CA2N +B short
|
|
|
*a
|
Component with harness connected
(Blind spot monitor sensor LH)
|
|
|
Result
|
Proceed to
|
OK
|
A
|
Open circuit in CAN main bus lines
|
B
|
Short circuit between bus lines
|
C
|
|
D
|
A
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH - BODY GROUND)
|
Click here
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH - POWER SOURCE)
|
Click here
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
(a) Reconnect the cable to the negative (-) battery terminal.
(b) Turn the power switch off.
(c) Turn the power switch on (IG).
(d) Check for DTCs.
Body Electrical > Blind Spot Monitor Master > Trouble Codes
OK:
No DTCs are output.
NG
|
|
|
5.
|
REPLACE BLIND SPOT MONITOR SENSOR RH
|
(a) Replace the blind spot monitor sensor RH.
Click here
NEXT
|
|
|
(a) Clear the DTCs.
Body Electrical > Blind Spot Monitor Master > Clear DTCs
(b) Recheck for DTCs and check if the same DTC is output again.
Body Electrical > Blind Spot Monitor Master > Trouble Codes
OK:
No DTCs are output.
OK |
|
END
|
7.
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CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH)
|
(a) Reconnect the O57 blind spot monitor sensor LH connector.
(b) Disconnect the O58 blind spot monitor sensor RH connector.
|
|
*a
|
Front view of wire harness connector
(to blind spot monitor sensor RH)
|
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O58-1 (CA2P) -O58-6 (CA2N)
|
Cable disconnected from negative (-) battery terminal
|
108 to 132 Ω
|
NG
|
|
|
8.
|
CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH)
|
(a) Disconnect the O57 blind spot monitor sensor LH connector.
|
|
*a
|
Front view of wire harness connector
(to blind spot monitor sensor LH)
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O57-1 (CA2P) - O57-6 (CA2N)
|
Cable disconnected from negative (-) battery terminal
|
108 to 132 Ω
|
NG |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BLIND SPOT MONITOR SENSOR RH)
|
9.
|
CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH)
|
(a) Reconnect the O57 blind spot monitor sensor LH connector.
(b) Disconnect the O58 blind spot monitor sensor RH connector.
|
|
*a
|
Front view of wire harness connector
(to blind spot monitor sensor RH)
|
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O58-1 (CA2P) -O58-6 (CA2N)
|
Cable disconnected from negative (-) battery terminal
|
108 to 132 Ω
|
NG
|
|
|
10.
|
CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH)
|
(a) Disconnect the O57 blind spot monitor sensor LH connector.
|
|
*a
|
Front view of wire harness connector
(to blind spot monitor sensor LH)
|
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O57-1 (CA2P) - O57-6 (CA2N)
|
Cable disconnected from negative (-) battery terminal
|
108 to 132 Ω
|
NG |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BLIND SPOT MONITOR SENSOR RH)
|
11.
|
CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH)
|
(a) Reconnect the O57 blind spot monitor sensor LH connector.
(b) Disconnect the O58 blind spot monitor sensor RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O58-1 (CA2P) - I26-4 (CG)
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
O58-6 (CA2N) - I26-4 (CG)
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
O58-1 (CA2P) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
O58-6 (CA2N) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
|
|
*1
|
DLC3
|
*a
|
Front view of wire harness connector
(to blind spot monitor sensor RH)
|
|
|
NG
|
|
|
12.
|
CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH)
|
(a) Disconnect the O57 blind spot monitor sensor LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
O57-1 (CA2P) - I26-4 (CG)
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
O57-6 (CA2N) - I26-4 (CG)
|
Cable disconnected from negative (-) battery terminal
|
200 Ω or higher
|
O57-1 (CA2P) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
O57-6 (CA2N) - I26-16 (BAT)
|
Cable disconnected from negative (-) battery terminal
|
6 kΩ or higher
|
|
|
*1
|
DLC3
|
*a
|
Front view of wire harness connector
(to blind spot monitor sensor LH)
|
|
|
NG |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - BLIND SPOT MONITOR SENSOR RH)
|
|