Honda Odyssey Service Manual: Headlight Leveling Control Unit Input Test/Replacement

Honda Odyssey Service Manual / Body / Body Electrical / Lighting / Day Time Running Lights System Description / Headlight Leveling Control Unit Input Test/Replacement

NOTE:

  • Before testing, make sure that there is no DTCs and the combination light switch circuit is OK.

  • Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A.

  1. Remove the bolt (A) from the headlight leveling control unit bracket.

  2. 1 2 3 4 5 6 7 8 9 10 1 1 1 2 1 3 1 4 1 5 1 6 GRNPURLT GRNBLKBRNGRYYELWHTPNKWire side of female terminalsA9.4 N?m (0.96 kgf?m, 6.9 lbf?ft)BC
  3. Disconnect the 16P connector (B) from the headlight leveling control unit (C).

  4. 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 are OK, go to step 4.


  5. 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.

    Cavity

    Wire

    Test condition

    Test: Desired result

    Possible cause if desired result is not obtained

    8

    GRY

    Ignition switch ON (II)

    Measure the voltage to ground:
    There should be battery voltage.

    • Blown No. D21 (7.5 A) fuse in the passenger's under-dash fuse/relay box

    • An open or high resistance in the wire

    16

    BLK

    In all ignition switch positions

    Measure the voltage to ground:
       There should be less than 0.2 V.

    • Poor ground (G403)

    • An open or high resistance in the ground wire

  6. Reconnect the connector to the headlight leveling control unit, and do the following input tests:

    • If any tests indicates a problem, find and correct the cause, then recheck the system.

    • If all the input tests prove OK, replace the headlight leveling control unit.

    NOTE: After replacing the control unit, do the headlight initial position learning procedure.

    Cavity

    Wire

    Test condition

    Test: Desired result

    Possible cause if desired result is not obtained

    7

    GRN

    Ignition switch ON (II),   headlight switch ON

    Measure the voltage between terminals No. 7 and No. 6:
    There should be battery voltage.

    • Faulty headlight leveling motor

    • An open or high resistance in the wire

    6

    YEL

    14

    BRN

    Ignition switch ON (II),   headlight switch ON

    Measure the voltage between terminals No. 14 and No. 6:
    There should be about 2 to 12 V.

    • Faulty headlight leveling motor

    • An open or high resistance in the wire

    6

    YEL

    5

    PUR

    Under all conditions

    • Measure the voltage between terminals No. 5 and No. 12: There should be about 5 V.

    • Measure the voltage between terminals No. 5 and No. 3: There should be about 0.5 to 4.5 V.

    • Faulty front suspension stroke sensor

    • An open or high resistance in the wire

    3

    LT GRN

    12

    PNK

    5

    PUR

    Under all conditions

    • Measure the voltage between terminals No. 5 and No. 12: There should be about 5 V.

    • Measure the voltage between terminals No. 5 and No. 2: There should be about 0.5 to 4.5 V.

    • Faulty rear suspension stroke sensor

    • An open or high resistance in the wire

    2

    WHT

    12

    PNK

    Headlight Adjustment

    Headlight Leveling Motor Replacement

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