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Home >> Acura >> 2012 >> RL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Adaptive Front Lighting System >> Adaptive Front Lighting Control Unit Input Test/Replacement

Adaptive Front Lighting Control Unit Input Test/Replacement

  1. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ), and the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  2. Disconnect the 40P connector (A) from the adaptive front lighting control unit (B).
    Fig 1: Disconnecting 40P Connector From Adaptive Front Lighting Control Unit
    G07355022Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bent, loose, or corroded, repair them as necessary and recheck the system.
    • If the terminals look OK, go to step 4.
  4. With the connector still disconnected, do the following input tests.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step 5.
      TEST CONDITION AND WIRE REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      23 LT BLU Under all conditions Measure resistance between terminals No. 37 and No. 23:
      There should be at least 3.5-6.5 Ω.
      • Faulty suspension stroke sensor
      • An open or high resistance in the wire
      37 GRY
      14 PUR Under all conditions Measure resistance between terminals No. 14 and No. 23:
      There should be at least 0.5-4.5 Ω.
      • Faulty suspension stroke sensor
      • An open or high resistance in the wire
      23 LT BLU
      16 PUR Under all conditions Measure resistance between terminals No. 16 and No. 23:
      There should be at least 0.5-4.5 Ω.
      • Faulty suspension stroke sensor
      • An open or high resistance in the wire
      23 LT BLU
      6 YEL Under all conditions Measure resistance between terminals No. 6 and No. 8:
      There should be at least 7.8-9.4 Ω.
      • Faulty right adaptive front lighting gearbox
      • An open or high resistance in the wire
      8 BRN
      7 WHT Under all conditions Measure resistance between terminals No. 7 and No. 9:
      There should be at least 7.8-9.4 Ω.
      • Faulty left adaptive front lighting gearbox
      • An open or high resistance in the wire
      9 BLU
      26 BLU Under all conditions Measure resistance between terminals No. 26 and No. 28:
      There should be at least 7.8-9.4 Ω.
      • Faulty right adaptive front lighting gearbox
      • An open or high resistance in the wire
      28 GRN
      27 RED Under all conditions Measure resistance between terminals No. 27 and No. 29:
      There should be at least 7.8-9.4 Ω.
      • Faulty left adaptive front lighting gearbox
      • An open or high resistance in the wire
      29 YEL
  5. Reconnect the 40P connector to the adaptive front lighting control unit, and do the following input tests.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the control unit must be faulty; replace it.
      TEST CONDITION AND WIRE REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      24 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground(G401)
      • An open or high resistance in the ground wire
      25
      21 GRN Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. 11 (15 A) fuse in the driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      22 BLU Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. 29 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      1 YEL Ignition switch ON (II) and headlight switch ON Measure the voltage between terminals No. 1 (+) and No. 30 (-):
      There should be battery voltage.
      • Faulty headlight leveling motor
      • An open or high resistance in the wire
      30 RED
      36 PNK Ignition switch ON (II) and headlight switch ON Measure the voltage between terminals No. 36 (+) and No. 30 (-):
      There should be at least 2-12 V (voltage should vary depending on leveling motor position).
      • Faulty headlight leveling motor
      • An open or high resistance in the wire
      30 RED
      13 GRN Ignition switch ON (II) and headlight switch ON Measure the voltage between terminals No. 13 (+) and No. 31 (-):
      There should be at least 0.5-4.5 V.
      • Faulty left adaptive front lighting gearbox
      • An open or high resistance in the wire
      31 PNK
      33 WHT Ignition switch ON (II) and headlight switch ON Measure the voltage between terminals No. 33 (+) and No. 31 (-):
      There should be at least 0.5-4.5 V.
      • Faulty right adaptive front lighting gearbox
      • An open or high resistance in the wire
      31 PNK
      32 BLU Ignition switch ON (II) and headlight switch ON Measure the voltage between terminals No. 32 (+) and No. 31 (-):
      There should be at least 4.5-5.5 V.
      • Faulty adaptive front lighting gearbox
      • An open or high resistance in the wire
      31 PNK
      3 PUR AFS OFF switch pushed Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground(G501)or an open in the ground wire
      • Faulty AFS OFF switch
      • An open or high resistance in the wire
      AFS OFF switch released Measure the voltage to ground:
      There should be at least 5 V.
      • Faulty AFS OFF switch
      • A short to ground in the wire
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