Exterior Lights (Driver's and Passenger's MICU) Input Test
NOTE:
  • Before testing, make sure that there is no DTC and the B-CAN line is OK with the HDS.
  • Before testing, check the No. 27 (10 A), No. 28 (10 A), and No. 30 (15 A) fuses in the driver's under-dash fuse/relay box and the No. 1 (10 A), No. 2 (10 A), and No. 4 (15 A) fuses in the passenger's under-dash fuse/relay box.
Driver's MICU
  1. Turn the ignition switch to LOCK (0).
  1. Remove the driver's dashboard undercover, then remove the dashboard lower cover.
  1. Disconnect driver's under-dash fuse/relay box connectors B, D, F, P, Q, and R.
    NOTE: All connector views are wire side of female terminals.
  1. 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 5 .
  1. With the connectors still disconnected, make these input tests at the connectors.
    • 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 6 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    Q1
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G502)
    • An open in the wire
    Q2
    BRN
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    R2
    BRN
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    R5
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G502)
    • An open in the wire
    F11 (LHD model)
    WHT
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
    • An open in the wire
    P9 (RHD model)
    WHT
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
    • Faulty passenger's under-dash fuse/relay box
    • An open in the wire
    F17
    BLU
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 3-3 (DR LT MAIN) (50 A) fuse in the under-hood fuse/relay box
    • An open in the wire
    F19
    BLK/RED
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 3-5 (DR LT MAIN) (40 A) fuse in the under-hood fuse/relay box
    • An open in the wire
    D11
    RED
    Under all conditions
    Connect the F19 and D11 terminals with a jumper wire: The taillights and the license plate lights should come on.(With daytime running lights, the front position lights also should come on.)
    • Blown bulb
    • Poor ground (G201 *3 , G302 *3 , G901)
    • An open in the wire

    *:
    With daytime running lights

    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    F10
    RED [GRY]
    Under all conditions
    Connect the F19 and F10 terminals with a jumper wire: The left [right] front position light should come on.
    • Blown bulb
    • Poor ground (G302) [G201]
    • An open in the wire
    F13
    WHT/RED [WHT]
    Under all conditions
    Connect the F19 and F13 terminals with a jumper wire: The left [right] headlight (high beam) should come on.
    • Blown bulb
    • Poor ground (G302) [G201]
    • An open in the wire
    F21
    RED/YEL [BRN]
    Under all conditions
    Connect the F19 and F21 terminals with a jumper wire: The left [right] headlight (low beam) should come on.
    • Blown bulb
    • Poor ground (G302) [G201]
    • Faulty HID unit
    • An open in the wire
    Q8
    GRN
    Under all conditions
    Check for continuity between the Q8 terminal and passenger's under-dash fuse/relay box connector A (38P) No. 17 terminal: There should be continuity.
    An open in the wire
    Check for continuity between the Q8 terminal and the automatic lighting/rain sensor *1 6P connector No. 1 terminal: There should be continuity.
    An open in the wire
    R3
    BLK
    Under all conditions
    Check for continuity between the R3 terminal and the combination light switch 12P connector No. 12 (or No. 7) *2 terminal: There should be continuity.
    An open in the wire

    [ ]:
    RHD model

    *1:
    With automatic lighting system
    *2:
    KQ model

  1. Reconnect the connectors to the driver's under-dash fuse/relay box, and make these input tests at the connectors.
    • 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 7 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    B1
    BLU
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    Faulty driver's under-dash fuse/relay box
    P9 (LHD model)
    WHT
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    P20
    BRN
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    D12
    BRN
    Driver's door open
    Measure the voltage to ground: There should be less than 1 V.
    • Faulty driver's door switch
    • An open in the wire
    Driver's door closed
    Measure the voltage to ground: There should be more than 5 V.
    • Faulty driver's door switch
    • A short to ground in the wire
    Q18
    WHT
    Ignition key inserted into the ignition switch
    Measure the voltage to ground: There should be less than 1 V.
    • Faulty ignition key switch
    • Poor ground (G503)
    • An open in the wire
    Ignition switch LOCK (0), and the ignition key removed from the ignition switch
    Measure the voltage to ground: There should be more than 5 V.
    • Faulty ignition key switch
    • A short to ground in the wire
    R6
    RED
    Combination light switch OFF
    Measure the voltage between R6 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch in any other position than OFF
    Measure the voltage between R6 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    R7
    GRY
    Combination light switch (SMALL position) ON
    Measure the voltage between R7 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Measure the voltage between R7 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    R8
    BRN
    Combination light switch (headlight) ON
    Measure the voltage between R8 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Measure the voltage between R8 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    R21
    GRN
    Combination light switch lever pulled (Passing)
    Measure the voltage between R21 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Measure the voltage between R21 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    R22
    LT BLU
    Combination light switch (Dimmer) in high beam position
    Measure the voltage between R22 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch (Dimmer) in low beam position
    Measure the voltage between R22 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire