DTC : B1084

DTC B1084  : Right Side LED Headlight Circuit Malfunction

DTC (MICU)

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 headlight switch ON.

   - 3. Wait for 7 seconds.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   B1084 Right Side LED Headlight Circuit Malfunction

   Is DTC B1084 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. DTC check

   -1. Check for DTCs with the HDS.

   DTC Description	DTC
   B1082 Left Side LED Headlight Circuit Malfunction
   B1083 Right Side LED Headlight Malfunction
   B1084 Right Side LED Headlight Circuit Malfunction

   Is DTC B1082, B1083, and/or B1084 indicated?

   YES 

   Faulty right LED control unit assembly; replace the right Headlight - Removal and Installation .

   YES 

   Go to step 3.

   NO 

   Go to step 5

3. Fuse check

   -1. Check the following fuse.

   Fuse	No. A13 (20A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 4.

   NO 

   Replace the fuse. If the fuse blows again, repair the short to ground in the A13 (20A) fuse circuit.

4. Headlight relay test

   -1. Do the headlight relay test.

   Power Relay (2016 2017 2018) or

   Power Relay (2019 2020 2021) .

   Is the headlight relay OK?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   Replace the headlight relay.

5. Fuse check

   -1. Check the following fuse.

   Fuse	No. A10 (10 A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 6.

   NO 

   Replace the fuse. If the fuse blows again, repair the short to ground in the A10 (10 A) fuse circuit.

6. Determine possible failure area (H/L LO R, R LED TELLTALE lines)

   -1. Disconnect the following connector.

   Right LED control unit assembly 8P connector

   - 2. Turn the headlight switch ON.

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

   Test condition	Vehicle OFF (LOCK) mode Headlight switch ON Right LED control unit assembly 8P connector: disconnected
   Test point 1	Right LED control unit assembly 8P connector No. 2
   Test point 2	Right LED control unit assembly 8P connector No. 4

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

   Is there battery voltage?

   YES 

   Go to step 7.

   NO 

   Go to step 8.

7. Open wire check (H/L LO R line)

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

   Test condition	Vehicle OFF (LOCK) mode Headlight switch ON Right LED control unit assembly 8P connector: disconnected
   Test point 1	Right LED control unit assembly 8P connector No. 2
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   Repair an open or high resistance in the ground wire or poor ground (G204).

   NO 

   Repair an open or high resistance in the wire.

8. Open wire check (R LED TELLTALE line)

   -1. Turn the headlight switch OFF.

   - 2. Disconnect the following connector.

   Under-dash fuse/relay box connector P (24P)

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

   Test condition	Vehicle OFF (LOCK) mode Right LED control unit assembly 8P connector: disconnected Under-dash fuse/relay box connector P (24P): disconnected
   Test point 1	Under-Dash Fuse/Relay Box Connector P (24P) No. 12
   Test point 2	Right LED control unit assembly 8P connector No. 6

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

   Is there continuity?

   YES 

   Go to step 9.

   NO 

   Repair an open or high resistance in the wire.

9. Shorted wire check (R LED TELLTALE line)

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

   Test condition	Vehicle OFF (LOCK) mode Right LED control unit assembly 8P connector: disconnected Under-dash fuse/relay box connector P (24P): disconnected
   Test point 1	Under-Dash Fuse/Relay Box Connector P (24P) No. 12
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   Faulty right LED control unit assembly; replace the right Headlight - Removal and Installation .