LEMON Manuals: Even more car manuals for everyone
Home >> Acura >> 2014 >> MDX SH-AWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lighting - Service, Testing And Troubleshooting (Except Hybrid) >> Exterior Lights Symptom Troubleshooting >> LED headlight does not come on

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  

    DTC (Relay Control Module)

    DTC 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 - Refer to: Combination Light Switch Removal, Installation, and Test (2014 2015), or Combination Light Switch Removal, Installation, and Test (2016 2017 2018 2019 2020) .

  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 (BRN)
    Test point 2 Body ground
    GHH320837Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 5.

    NO 

    Go to step 6.

  5. Open wire check (PGND 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 PGND
    Test point 1 Combination light switch 12P connector No. 6 (BLK)
    Test point 2 Body ground
    GHH320838Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The PGND wire is OK. Faulty combination light switch; do the combination light switch test - Refer to: Combination Light Switch Removal, Installation, and Test (2016 2017 2018 2019 2020), or Combination Light Switch Removal, Installation, and Test (2014 2015) .

    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) - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation .

    - 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 (BRN)
    Test point 2 Combination light switch 12P connector No. 7 (BRN)
    GHH320839Courtesy 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 - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation .

    NO 

    Repair an open or high resistance in the wire.

scientia non olet · About LEMON Manuals