DTC Troubleshooting: B2646
DTC B2646: Front Sensor Power Failure
NOTE:
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
The connection order of the sensor is 1st ? 2nd ? 3rd ? 4th from the side near the control unit.

DTC Description
DTC
B2646 Front Sensor Power Failure
  

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.
Wait for at least 6 seconds.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
B2646 Front Sensor Power Failure
  

Is DTC B2646 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Shorted wire check (BOF SIDE L, E1 SIDE L lines) 1:

Shorted wire check (BOF SIDE L, E1 SIDE L lines) 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Parking and back-up sensor control unit 16P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Test point 1
Parking and back-up sensor control unit 16P connector No. 7
Test point 2
Parking and back-up sensor control unit 16P connector No. 13

Is there 1 M? or more?

     
YES
     
     
     
Go to step 10.
     
NO
     
     
     
Go to step 3.
3.
Shorted wire check (BOF SIDE R, E1 SIDE R lines) 1:

Shorted wire check (BOF SIDE R, E1 SIDE R lines) 1
?1.
Disconnect the following connector.
Right front center sensor 6P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Right front center sensor 6P connector: disconnected
Test point 1
Right front center sensor 6P connector No. 5
Test point 2
Right front center sensor 6P connector No. 1


Is there 1 M? or more?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 4.
4.
Shorted wire check (BOF SIDE R, E1 SIDE R lines) 2:

Shorted wire check (BOF SIDE R, E1 SIDE R lines) 2
?1.
Disconnect the following connector.
Right front corner sensor 6P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Right front center sensor 6P connector: disconnected
Right front corner sensor 6P connector: disconnected
Test point 1
Right front center sensor 6P connector No. 5
Test point 2
Right front center sensor 6P connector No. 1


Is there 1 M? or more?

     
YES
     
     
     
     
NO
     
     
     
Repair a short in the BOF SIDE R and E1 SIDE R wires between the right front center sensor and the right front corner sensor.?
5.
Shorted wire check (BOF CTR R, E1 CTR R lines) 1:

Shorted wire check (BOF CTR R, E1 CTR R lines) 1
?1.
Reconnect the following connector.
Right front center sensor 6P connector

?2.
Disconnect the following connector.
Left front center sensor 6P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Left front center sensor 6P connector: disconnected
Test point 1
Left front center sensor 6P connector No. 5
Test point 2
Left front center sensor 6P connector No. 1


Is there 1 M? or more?

     
YES
     
     
     
Go to step 7.
     
OK
     
     
     
Go to step 6.
6.
Shorted wire check (BOF CTR R, E1 CTR R lines) 2:

Shorted wire check (BOF CTR R, E1 CTR R lines) 2
?1.
Disconnect the following connector.
Right front center sensor 6P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Left front center sensor 6P connector: disconnected
Right front center sensor 6P connector: disconnected
Test point 1
Left front center sensor 6P connector No. 5
Test point 2
Left front center sensor 6P connector No. 1


Is there 1 M? or more?

     
YES
     
     
     
     
NO
     
     
     
Repair a short in the BOF CTR R and E1 CTR R wires between the left front center sensor and the right front center sensor.?
7.
Shorted wire check (BOF CTR L, E1 CTR L lines) 1:

Shorted wire check (BOF CTR L, E1 CTR L lines) 1
?1.
Reconnect the following connector.
Left front center sensor 6P connector

?2.
Disconnect the following connector.
Left front corner sensor 6P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Left front corner sensor 6P connector: disconnected
Test point 1
Left front corner sensor 6P connector No. 5
Test point 2
Left front corner sensor 6P connector No. 1


Is there 1 M? or more?

     
YES
     
     
     
Go to step 9.
     
NO
     
     
     
Go to step 8.
8.
Shorted wire check (BOF CTR L, E1 CTR L lines) 2:

Shorted wire check (BOF CTR L, E1 CTR L lines) 2
?1.
Disconnect the following connector.
Left front center sensor 6P connector

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Left front corner sensor 6P connector: disconnected
Left front center sensor 6P connector: disconnected
Test point 1
Left front corner sensor 6P connector No. 5
Test point 2
Left front corner sensor 6P connector No. 1


Is there 1 M? or more?

     
YES
     
     
     
     
NO
     
     
     
Repair a short in the BOF CTR L and E1 CTR L wires between the left front corner sensor and the left front center sensor.?
9.
Shorted wire check (BOF SIDE L, E1 SIDE L lines) 2:

Shorted wire check (BOF SIDE L, E1 SIDE L lines) 2
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Left front corner sensor 6P connector: disconnected
Test point 1
Parking and back-up sensor control unit 16P connector No. 7
Test point 2
Parking and back-up sensor control unit 16P connector No. 13

Is there 1 M? or more?

     
YES
     
     
     
     
NO
     
     
     
Repair a short in the BOF SIDE L and E1 SIDE L wires between the parking and back-up sensor control unit and the left front corner sensor.?
10.
Shorted wire check (BOF SIDE L line):

Shorted wire check (BOF SIDE L line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Parking and back-up sensor control unit 16P connector: disconnected
Test point 1
Parking and back-up sensor control unit 16P connector No. 7
Test point 2
Body ground

Is there 1 M? or more?

     
YES
     
     
     
     
NO
     
     
     
Repair a short to ground in the BOF SIDE L wire.?