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MICU Input Test

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NOTE:
  • Before testing, make sure the No. B6 (7.5 A), No. B16 (10 A), No. B18 (20 A), No. B20 (10 A), and No. B24 (10 A) fuses in the under-hood fuse/relay box, and the No. C11 (7.5 A), No. C27 (7.5 A) fuses in the driver's under-dash fuse/relay box are OK.
  • Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. Turn the ignition switch to LOCK (0).
  2. Remove the driver's kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
  3. Disconnect driver's under-dash fuse/relay box connectors E, F, G, H, P, and Q.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Multiplex Integrated Control Unit Connector Terminals
    G06968774Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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 look OK, go to step 5.
  5. With the connectors 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 6.
      MICU TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      E4
      .
      F7      		 LT GRN
      .
      LT GRN      		 Brake pedal pressed Connect terminals F7 and E4 with a jumper wire:
      The brake lights and high mount brake light should come on.
      • Blown bulb
      • Faulty brake pedal position switch
      • Poor ground(G801, G802) or an open in the ground wire
      • An open or high resistance in the wire
  6. With the connectors 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 7.
      MICU TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      F24 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. B16 (10 A) fuse in the under-hood fuse/relay box
      • An open or high resistance in the wire
      H1 BRN Under all conditions Check for continuity to ground: There should be continuity.
      • Poor ground (G402)
      • An open or high resistance in the ground wire
      G5 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
      P2 BLK In all ignition switch positions Measure the voltage to ground: There should be battery voltage.
      • Poor ground (G401)
      • An open or high resistance in the ground wire
      E22 LT BLU Driver's door open Measure the voltage to ground: There should be less than 0.2 V.
      • Faulty driver's door switch
      • Faulty driver's door switch ground
      • An open or high resistance in the wire
      Driver's door closed Measure the voltage to ground: There should be about 5 V.
      • Faulty driver's door switch
      • A short to ground in the wire
      Q4 PNK Ignition key inserted into the ignition switch Measure the voltage to ground: There should be less than 0.2 V.
      • Faulty ignition key switch
      • Poor ground (G402) or an open in the ground wire
      • An open or high resistance in the wire
      Ignition switch LOCK (0), and the ignition key removed from the ignition switch Measure the voltage to ground: There should be about 5 V.
      • Faulty ignition key switch
      • A short to ground in the wire
      F30 WHT Ignition switch ON (II). Transmission range switch in any other position then R. Measure the voltage to ground: There should be battery voltage.
      • Blown No. C11 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • Faulty reverse relay
      • Faulty driver's under-dash fuse/relay box
      Ignition switch ON (II). Transmission range switch in R position. Measure the voltage to ground: There should be about 5 V.
      • Faulty transmission range switch
      • Poor ground (G101) or an open in the ground wire
      • An open or high resistance in the wire
      P17
      .
      P13      		 PNK
      .
      BLK      		 Combination light switch OFF Measure the voltage between terminals P13 and P17: There should be less than 0.2 V.
      • Faulty combination light switch
      • An open or high resistance in the wire
      Combination light switch in any other position than OFF Measure the voltage between terminals P13 and P17: There should be about 5 V.
      • Faulty combination light switch
      • A short to ground in the wire
      P19
      .
      P13      		 GRY
      .
      BLK      		 Combination light switch (parking light) ON Measure the voltage between terminals P13 and P17:
      There should be less than 0.2 V.
      • Faulty combination light switch
      • An open or high resistance in the wire
      Combination light switch OFF Measure the voltage between terminals P13 and P17:
      There should be about 5 V.
      • Faulty combination light switch
      • A short to ground in the wire
      P15
      .
      P13      		 BRN
      .
      BLK      		 Combination light switch (headlight) ON Measure the voltage between terminals P13 and P15: There should be less than 0.2 V.
      • Faulty combination light switch
      • An open or high resistance in the wire
      Combination light switch OFF Measure the voltage between terminals P13 and P15: There should be about 5 V.
      • Faulty combination light switch
      • A short to ground in the wire
      P20
      .
      P13      		 RED
      .
      BLK      		 Combination light switch lever pulled (Passing) Measure the voltage between terminals P13 and P20: There should be less than 0.2 V.
      • Faulty combination light switch
      • An open or high resistance in the wire
      Combination light switch lever released (OFF) Measure the voltage between terminals P13 and P20: There should be about 5 V.
      • Faulty combination light switch
      • A short to ground in the wire
      P21
      .
      P13      		 LT BLU
      .
      BLK      		 Combination light switch (Dimmer) in high beam position Measure the voltage between terminals P13 and P21: There should be less than 0.2 V.
      • Faulty combination light switch
      • An open or high resistance in the wire
      Combination light switch (Dimmer) in low beam position Measure the voltage between terminals P13 and P21: There should be about 5 V.
      • Faulty combination light switch
      • A short to ground in the wire
      P18
      .
      P13      		 PUR
      .
      BLK      		 Fog light switch ON Measure the voltage between terminals P13 and P18: There should be less than 0.2 V.
      • Faulty combination light switch
      • An open or high resistance in the wire
      Fog light switch OFF Measure the voltage between terminals P13 and P18: There should be about 5 V.
      • Faulty combination light switch
      • A short to ground in the wire
      F14 YEL Driver's under-dash fuse/relay box connector F (32P) disconnected Check for continuity between terminal F14 and the relay control module connector B (16P) terminal No. 14: There should be continuity. An open or high resistance in the wire
      Measure the voltage to ground: There should be about 5 V. A short to ground in the wire
  7. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU).
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