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Home >> Acura >> 2014 >> RLX Base >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lighting - Testing & Troubleshooting (Except Hybrid) >> Symptom Troubleshooting >> Exterior Lights Symptom Troubleshooting - LED headlight does not come on

Exterior Lights Symptom Troubleshooting - LED headlight does not come on

  1. DTC check 1

    -1. Connect the HDS to the data link connector (DLC) .

    -2. Check for DTCs with the HDS.

    DTC Description DTC
    B1081  
    B1082  
    B1083  
    B1084  

    Are DTCs B1081, B1082, B1083, and/or B1084 indicated?

    YES 

    Do the indicated DTC's troubleshooting.

    NO 

    Go to step 2.

  2. Combination light switch HEADLIGHT position check

    -1. Turn the combination light switch ON.

    -2. Check the parameter(s) below with the HDS.

    Signal Threshold Current conditions
    Values Unit Values Unit
    Headlight Switch (HEADLIGHT) ON      

    Is data list values correct?

    YES 

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

    NO 

    Go to step 3.

  3. Combination light switch check

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

    -2. Do the combination light switch test .

    Is the switch OK?

    YES 

    Go to step 4.

    NO 

    Replace the combination light switch .

  4. Open wire check (H/L ON SW line) 1

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

    Test condition Vehicle OFF (LOCK) mode
    Combination light switch 12P connector: disconnected
    Test circuit H/L ON SW
    Test point 1 Combination light switch 12P connector No. 7 (GRN)
    Test point 2 Body ground
    GHH346366Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 5.

    NO 

    Go to step 6.

  5. Open wire check (COMBI SW GND (LT) line)

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

    Test condition Vehicle OFF (LOCK) mode
    Combination light switch 12P connector: disconnected
    Test circuit COMBI SW GND (LT)
    Test point 1 Combination light switch 12P connector No. 6 (LT BLU)
    Test point 2 Body ground
    GHH346367Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The COMBI SW GND (LT) wire is OK. Faulty combination light switch; do the combination light switch test .

    NO 

    Repair an open or high resistance in the wire.

  6. Open wire check (H/L ON SW line) 2

    -1. Disconnect the following connector.

    Driver's under-dash fuse/relay box connector P (24P)

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

    Test condition Vehicle OFF (LOCK) mode
    Combination light switch 12P connector: disconnected
    Under-dash fuse/relay box connector P (24P): disconnected
    Test circuit H/L ON SW
    Test point 1 Driver's under-dash fuse/relay box connector P (24P) No. 15 (GRN)
    Test point 2 Combination light switch 12P connector No. 7 (GRN)
    GHH346368Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The H/L ON SW wire is OK. Faulty MICU; replace the driver's under-dash fuse/relay box .

    NO 

    Repair an open or high resistance in the wire.

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