DTC B2A70-12

DTC B2A70-12  : LDW/RDM Switch Signal Circuit Short

DTC (IDAS)

1. 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 switch.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   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 1

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check the following fuse.

   Fuse

   No. E2

   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. E2 fuse circuit.

3. Fuse check 2

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check the following fuse.

   Fuse

   No. C5

   Is the fuse OK?

   YES 

   The fuse is OK. Reinstall the fuse, then go to step 4.

   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. C5 fuse circuit.

4. Open wire check (IG1 OPTION line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   RDM switch 10P connector

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	RDM switch 10P connector: disconnected
   Test point 1	RDM switch 10P connector No. 5:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   Go to step 5.

   NO 

   Repair an open in the wire between Under-dash fuse/relay box and the RDM switch.

5. RDM switch check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Test the RDM switch .

   Is the RDM switch OK?

   YES 

   RDM switch is OK. Go to step 6.

   NO 

   Replace the RDM switch .

6. 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 mode
   	Multipurpose camera unit 20P connector: disconnected
   	RDM switch 10P connector: disconnected
   Test point 1	Multipurpose camera unit 20P connector No. 8
   Test point 2	RDM switch 10P connector No. 4:

   Courtesy of HONDA, U.S.A., INC.

   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 switch and the multipurpose camera unit.