Control Unit Input Test

Multiplex Integrated Control Unit 

1. Turn the ignition switch to LOCK (0).
2. Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
3. Disconnect driver's under-dash fuse/relay box connectors E and H (see DRIVER'S UNDER-DASH FUSE/RELAY BOX ).
   Fig 1: Identifying Driver Under-Dash Fuse/Relay Box Connectors E And H

   Courtesy 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. Reconnect the connectors to the driver's under-dash fuse/relay box. Turn the ignition switch to ON (II) and make these input tests at the appropriate connectors on the driver's under-dash fuse/relay box.
   • 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.
     WIRE CAVITY CHART
     
     

     Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
     E15	GRN	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 5 V or more.	Faulty driver's door switch A short to ground in the wire
     H12	LT GRN/ RED	Front passenger's door open	Measure the voltage to ground: There should be less than 1 V.	Faulty front passenger's door switch An open in the wire
     		Front passenger's door closed	Measure the voltage to ground: There should be 5 V or more.	Faulty front passenger's door switch A short to ground in the wire
     E14	GRN/YEL	Left rear door open	Measure the voltage to ground: There should be less than 1 V.	Faulty left rear door switch An open in the wire
     		Left rear door closed	Measure the voltage to ground: There should be 5 V or more.	Faulty left rear door switch A short to ground in the wire
     H13	GRN/WHT	Right rear door open	Measure the voltage to ground: There should be less than 1 V.	Faulty right rear door switch An open in the wire
     		Right rear door closed	Measure the voltage to ground: There should be 5 V or more.	Faulty right rear door switch A short to ground in the wire

   Gauge Control Module 

6. Turn the ignition switch to LOCK (0).
7. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).
8. Disconnect gauge control module connector A (30P).
   Fig 2: Identifying Gauge Control Module Connector A (30P)

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. 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 10.
10. Reconnect the connector to the gauge control module, turn the ignition switch to ON (II) 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 11.
      WIRE CAVITY CHART
      
      

      Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
      A5	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire
      A6	WHT/RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire
      A21	BLK	Under all conditions	Measure the voltage to ground: There should be less than 0.5 V.	Poor ground (G502) An open in the wire

    MICU-Rear Junction Box 

11. Remove the right rear side trim (see TRIM REMOVAL/INSTALLATION - REAR SIDE AREA ).
12. Disconnect MICU-rear junction box connector F (13P).
    Fig 3: Identifying MICU-Rear Junction Box Connector F (13P)

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. 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 14.
14. Reconnect the connector to the MICU-rear junction box. Turn the ignition switch to ON (II) and make these input tests at the appropriate connectors on the MICU-rear junction box.
    • 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 15.
      WIRE CAVITY CHART
      
      

      Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
      F3(1)	LT GRN/ BLK	Tailgate open	Measure the voltage to ground: There should be less than 1 V.	Faulty tailgate closer unit An open in the wire
      		Tailgate closed	Measure the voltage to ground: There should be 5 V or more.	Faulty tailgate closer unit A short to ground in the wire
      F3(2)	GRN/BLK	Tailgate open	Measure the voltage to ground: There should be less than 1 V.	Poor ground (G701) Faulty tailgate latch switch An open in the wire
      		Tailgate closed	Measure the voltage to ground: There should be 5 V or more.	Faulty tailgate latch switch A short to ground in the wire
      (1) With power tailgate (2) Without power tailgate

15. If all the input tests prove OK, and no DTCs were found during multiplex integrated control system troubleshooting (B-CAN System Diagnostic Test Mode A), go to the B-CAN system input and output index (see B-CAN SYSTEM UNIT INPUT/OUTPUT INDEX ). If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU). If input failures are related to particular control unit, replace the control unit.