( TF09E8PJ34600041951FCAT00 )
MICS (MICU) Input Test

  1. Turn the ignition switch to LOCK (0).
  1. Disconnect under-dash fuse/relay box connectors A, B, K, M, N, P, and Q.
    NOTE: All connector views are shown from 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
    N2
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    K10
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G502)
    • An open in the wire
    Q9
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G502)
    • An open in the wire
    M16
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    M14
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    Q2
    BLU
    Under all conditions
    Check for continuity between the Q2 terminal and the data link connector (16P) connector No. 7 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q2
    BLU
    Immobilizer-keyless control unit 7P connector disconnected
    Check for continuity between the Q2 terminal and the immobilizer-keyless control unit 7P connector No. 5 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q2
    BLU
    Audio unit connector A (24P) disconnected
    Check for continuity between the Q2 terminal and audio unit connector A (24P) No. 3 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q2
    BLU
    SRS unit connector A (39P) disconnected
    Check for continuity between the Q2 terminal and SRS unit connector A (39P) No. 18 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q2
    BLU
    ABS modulator-control unit 25P connector disconnected
    Check for continuity between the Q2 terminal and the ABS modulator-control unit 25P connector No. 10 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q2
    BLU
    EPS control unit connector C(16P) disconnected
    Check for continuity between the Q2 terminal and EPS control unit connector C (16P) No. 16 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q3
    GRN [LT GRN]
    Immobilizer-keyless control unit 7P connector disconnected
    Check for continuity between the Q3 terminal and the immobilizer-keyless control unit 7P connector No. 4 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Q3
    GRN [LT GRN]
    Gauge control module 32P connector disconnected
    Check for continuity between the Q3 terminal and the gauge control module 32P connector No. 18 terminal: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire

    [ ]:
    LHD model

  1. Reconnect the connectors to the under-dash fuse/relay box, and make these input tests at the connector.
    • 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
    N1
    PNK
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 1 (10 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    M18
    PUR
    Ignition switch ACC (I)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 14 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    K8
    RED
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 20 (15 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    Q8
    LT BLU
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 22 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    P2
    PUR
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 6 (10 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    A32
    PUR
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 11 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    B11
    PUR
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 11 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire

  1. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace the control unit.