DTC B2A70-12

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

NOTE:  Before you troubleshoot, review the general troubleshooting information .

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, then the ON mode.

   -4. Press the RDM 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 . 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.

2. RDM switch internal resistance check

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

   -2. Remove the CMBS OFF switch/RDM switch, and test the RDM switch .

   Is the RDM switch OK?

   YES 

   RDM switch is OK. Go to step 3.

   NO 

   Replace the CMBS OFF switch/RDM switch .

3. Fuse check

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

   -2. Check the following fuse.

   Fuse

   No. C39

   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. C39 fuse circuit.

4. Shorted wire check (LDW OFF SW line)

   -1. Disconnect the following connectors.

   CMBS OFF switch/RDM switch 12P connector

   Multipurpose camera unit 20P connector

   -2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	CMBS OFF switch/RDM switch 12P connector : disconnected
   	Multipurpose camera unit 20P connector: disconnected
   Test point 1	CMBS OFF switch/RDM switch 12P connector (female terminals) No. 8:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in the LDW OFF SW wire between the RDM switch and the multipurpose camera unit.

   NO 

   Go to step 5.

5. Open wire check (IG1 OPTION line)

   -1. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	CMBS OFF switch/RDM switch 12P connector : disconnected
   	Multipurpose camera unit 20P connector: disconnected
   Test point 1	CMBS OFF switch/RDM switch 12P connector (female terminals) No. 11:
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Go to step 6.

   NO 

   Repair an open in the IG1 OPTION wire between the No. C39 fuse and the RDM switch.

6. Open wire check (LDW OFF SW line)

   -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
   	CMBS OFF switch/RDM switch 12P connector : disconnected
   	Multipurpose camera unit 20P connector: disconnected
   Test point 1	Multipurpose camera unit 20P connector No. 8
   Test point 2	CMBS OFF switch/RDM switch 12P connector (female terminals) No. 8:

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

   Is there continuity?

   YES 

   Go to step 7.

   NO 

   Repair an open in the LDW OFF SW wire between the RDM switch and the multipurpose camera unit.

7. Open wire check (LDW OFF IND line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	CMBS OFF switch/RDM switch 12P connector : disconnected
   	Multipurpose camera unit 20P connector: disconnected
   Test point 1	Multipurpose camera unit 20P connector No. 11
   Test point 2	CMBS OFF switch/RDM switch 12P connector (female terminals) No. 12:

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

   Is there continuity?

   YES 

   Replace the multipurpose camera unit .

   NO 

   Repair an open in the LDW OFF IND wire between the RDM switch and the multipurpose camera unit.