DTC : B2477

DTC B2477  : Rear Height Sensor failure

DTC (Headlight Leveling Control Unit)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to:

Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

1. Problem verification

   -1. Clear the DTCs with the HDS.

   Clear DTCs

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

   - 3. Wait for at least 10 seconds.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   B2477 Rear Height Sensor failure

   Is DTC B2477 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. DTC check

   -1. Check for DTCs with the HDS.

   DTC Description	DTC
   B2476 Front Height Sensor failure

   Is DTC B2476 also indicated?

   YES 

   Go to step 7.

   NO 

   Go to step 3.

3. Determine possible failure area (H/L ADJ SSR line low voltage failure, others)

   -1. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Adjust sensor value	Less than 0.4	V

   Do the current condition(s) match the threshold?

   YES 

   Go to step 4.

   NO 

   Go to step 6.

4. Open wire check (H/L ADJ SSR, H/L ADL SV, H/L ADJ SG lines)

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

   - 2. Disconnect the following connectors.

   Rear suspension stroke sensor 3P connector

   Headlight leveling control unit 12P connector

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

   Test condition	Vehicle OFF (LOCK) mode Rear suspension stroke sensor 3P connector: disconnected Headlight leveling control unit 12P connector: disconnected
   Test point 1	Headlight leveling control unit 12P connector No. 1
   Test point 2	Rear suspension stroke sensor 3P connector No. 2

   Test point 1	Headlight leveling control unit 12P connector No. 10
   Test point 2	Rear suspension stroke sensor 3P connector No. 3

   Test point 1	Headlight leveling control unit 12P connector No. 3
   Test point 2	Rear suspension stroke sensor 3P connector No. 1

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

   Is there continuity?

   YES 

   The H/L ADJ SSR, H/L ADJ SV, and H/L ADJ SG wires are not open. Go to step 5.

   NO 

   Repair an open or high resistance in the wire.

5. Shorted wire check (H/L ADJ SSR, H/L ADJ SV lines)

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

   Test condition	Vehicle OFF (LOCK) mode Rear suspension stroke sensor 3P connector: disconnected Headlight leveling control unit 12P connector: disconnected
   Test point 1	Rear suspension stroke sensor 3P connector No. 2
   Test point 2	Body ground

   Test point 1	Rear suspension stroke sensor 3P connector No. 3
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The H/L ADJ SSR and H/L ADJ SV wires are OK. Replace the Rear Suspension Stroke Sensor Removal and Installation .

6. Shorted wire check (H/L ADJ SSR to H/L ADJ SV line)

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

   - 2. Disconnect the following connectors.

   Rear suspension stroke sensor 3P connector

   Headlight leveling control unit 12P connector

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

   Test condition	Vehicle OFF (LOCK) mode Rear suspension stroke sensor 3P connector: disconnected Headlight leveling control unit 12P connector: disconnected
   Test point 1	Rear suspension stroke sensor 3P connector No. 2
   Test point 2	Rear suspension stroke sensor 3P connector No. 3

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

   Is there continuity?

   YES 

   Repair a short in the wires.

   NO 

   The H/L ADJ SSR to H/L ADJ SV wire is OK. Replace the Rear Suspension Stroke Sensor Removal and Installation .

7. Open wire check (H/L ADJ SV line)

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

   - 2. Disconnect the following connectors.

   Rear suspension stroke sensor 3P connector

   Headlight leveling control unit 12P connector

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

   Test condition	Vehicle OFF (LOCK) mode Rear suspension stroke sensor 3P connector: disconnected Headlight leveling control unit 12P connector: disconnected
   Test point 1	Headlight leveling control unit 12P connector No. 10
   Test point 2	Rear suspension stroke sensor 3P connector No. 3

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

   Is there continuity?

   YES 

   The H/L ADJ SV wire is OK. Go to step 8.

   NO 

   Repair an open or high resistance in the wire.

8. Open wire check (H/L ADJ SG line)

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

   Test condition	Vehicle OFF (LOCK) mode Rear suspension stroke sensor 3P connector: disconnected Headlight leveling control unit 12P connector: disconnected
   Test point 1	Headlight leveling control unit 12P connector No. 3
   Test point 2	Rear suspension stroke sensor 3P connector No. 1

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

   Is there continuity?

   YES 

   The H/L ADJ SG wire is OK. Replace the Headlight Leveling Control Unit - Removal and Installation .

   NO 

   Repair an open or high resistance in the wire.