DTC Troubleshooting: B2A70-12
DTC B2A70-12: LDW/RDM Switch Signal Circuit Short
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
B2A70-12 LDW/RDM Switch Signal Circuit Short
    

1.
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 press the RDM OFF switch.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
B2A70-12 LDW/RDM Switch Signal Circuit Short
    

Is DTC B2A70-12 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.?
2.
Fuse check:

Fuse check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuse.
Fuse
No. B7 (7.5 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 3.
     
NO
     
     
     
Replace the fuse. Turn the vehicle to the ON mode, then the OFF (LOCK) mode. If the fuse blows again, repair the short to ground on the No. B7 (7.5 A) fuse circuit.?
3.
Open wire check (IG1 OPTION line):

Open wire check (IG1 OPTION line)
?1.
Disconnect the following connector.
RDM OFF switch 5P connector

?2.
Turn the vehicle to the ON mode.

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
RDM OFF switch 5P connector: disconnected
Test point 1
RDM OFF switch 5P connector No. 5
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG1 OPTION wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the wire between the RDM OFF switch and the under-dash fuse/relay box.?
4.
RDM OFF switch check:

RDM OFF switch check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Test the RDM OFF switch.

Is the RDM OFF switch OK?

     
YES
     
     
     
RDM OFF switch is OK. Go to step 5.
     
NO
     
     
     
5.
Open wire check (LDW OFF SW line):

Open wire check (LDW OFF SW line)
?1.
Disconnect the following connector.
Multipurpose camera unit 20P connector

?2.
Turn the vehicle to the ON mode.

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Multipurpose camera unit 20P connector: disconnected
 
RDM OFF switch 5P connector: disconnected
Test point 1
Multipurpose camera unit 20P connector No. 8
Test point 2
RDM OFF switch 5P connector No. 2


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.?
     
NO
     
     
     
Repair an open in the wire between the RDM OFF switch and the multipurpose camera unit.?