DTC Troubleshooting: B1084 (2014 2015 2016 2017)

DTC B1084  : Right Side LED Headlight Circuit Malfunction

DTC (Relay Control Module)

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

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the headlight switch ON.

   -3. Wait for at least 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 (low beam); replace the right headlight assembly .

   YES 

   Go to step 3.

   NO 

   Go to step 4

3. Headlight relay test

   -1. Do the headlight relay test .

   Is the headlight relay OK?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   Replace the headlight relay.

4. Fuse check

   -1. Check the following fuse.

   Fuse	No. C26 (15A)
   Location	Under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 5.

   NO 

   Replace the fuse. If the fuse blows again, repair a short to ground in the No. C26 (15 A) fuse circuit.

5. Determine possible failure area (R H/L LO line, H/L LO R SIG line)

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

   -2. Disconnect the following connector.

   -3. Turn the headlight switch ON.

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

   Test condition	Vehicle OFF (LOCK) mode Right LED control unit assembly 6P connector (low beam): disconnected
   Test circuit	R H/L LO, GND
   Test point 1	Right LED control unit assembly 6P connector (low beam) No. 1 (WHT)
   Test point 2	Right LED control unit assembly 6P connector (low beam) No. 2 (BLK)

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

   Is there battery voltage?

   YES 

   Go to step 7.

   NO 

   Go to step 6.

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

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

   Test condition	Vehicle OFF (LOCK) modeRight LED control unit assembly 6P connector (low beam): disconnected
   Test circuit	R H/L LO
   Test point 1	Right LED control unit assembly 6P connector (low beam) No. 1 (WHT)
   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 (G201).

   NO 

   Repair an open or high resistance in the wire.

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

   -1. Turn the headlight switch OFF.

   -2. Disconnect the following connector.

   Relay control module connector A (16P)

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

   Test condition	Vehicle OFF (LOCK) mode Right LED control unit assembly 6P connector (low beam): disconnected Relay control module connector A (16P): disconnected
   Test circuit	H/L LO R SIG
   Test point 1	Relay control module connector A (16P) No. 8 (PNK)
   Test point 2	Right LED control unit assembly 6P connector (low beam) No. 6 (PNK)

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

   Is there continuity?

   YES 

   Go to step 8.

   NO 

   Repair an open or high resistance in the wire.

8. Shorted wire check (H/L LO R SIG line)

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

   Test condition	Vehicle OFF (LOCK) mode Right LED control unit assembly 6P connector (low beam): disconnected Relay control module connector A (16P): disconnected
   Test circuit	H/L LO R SIG
   Test point 1	Relay control module connector A (16P) No. 8 (PNK)
   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 

   Faulty right LED control unit assembly (low beam); replace the right headlight assembly .