DTC Troubleshooting: B2A80-00
DTC B2A80-00: Lost Serial Communication With The EPS Control Unit
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
B2A80-00 Lost Serial Communication With The EPS Control Unit
    

1.
EPS system DTCs check:

EPS system DTCs check
?1.
Turn the vehicle to the ON mode.

?2.
Check for EPS system DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Are any DTCs indicated?

     
YES
     
     
     
     
NO
     
     
     
Go to step 2.
2.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode.

?4.
Turn the vehicle to the ON mode, then wait for at least 2 seconds.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
B2A80-00 Lost Serial Communication With The EPS Control Unit
    

Is DTC B2A80-00 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.?
3.
Shorted wire check (LKASTOEPS, EPSTOLKAS lines) 1:

Shorted wire check (LKASTOEPS, EPSTOLKAS lines) 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Multipurpose camera unit 20P connector
EPS control unit connector A (11P)

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Multipurpose camera unit 20P connector: disconnected
 
EPS control unit connector A (11P): disconnected
Test point 1
Multipurpose camera unit 20P connector No. 1
Test point 2
Body ground

Test point 1
Multipurpose camera unit 20P connector No. 12
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
Repair a short to power between the multipurpose camera unit and body ground.?
     
NO
     
     
     
The LKASTOEPS and EPSTOLKAS wires are OK. Go to step 4.
4.
Shorted wire check (LKASTOEPS, EPSTOLKAS lines) 2:

Shorted wire check (LKASTOEPS, EPSTOLKAS lines) 2
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Multipurpose camera unit 20P connector: disconnected
 
EPS control unit connector A (11P): disconnected
Test point 1
Multipurpose camera unit 20P connector No. 1
Test point 2
Body ground

Test point 1
Multipurpose camera unit 20P connector No. 12
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground between the multipurpose camera unit and body ground.?
     
NO
     
     
     
The LKASTOEPS and EPSTOLKAS wires are OK. Go to step 5.
5.
Open wire check (LKASTOEPS, EPSTOLKAS lines):

Open wire check (LKASTOEPS, EPSTOLKAS lines)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Multipurpose camera unit 20P connector: disconnected
 
EPS control unit connector A (11P): disconnected
Test point 1
Multipurpose camera unit 20P connector No. 1
Test point 2
EPS control unit connector A (11P) No. 5


Is there continuity?

     
YES
     
     
     
Check for loose terminals and poor connections in the multipurpose camera unit 20P connector. If they are OK, replace the multipurpose camera unit.?
Multipurpose camera unit
     
NO
     
     
     
Repair an open in the wire between the multipurpose camera unit and the EPS control unit.?