Control Unit Input Test

Multiplex Integrated Control Unit 

1. Turn the ignition switch OFF.
2. Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
3. Disconnect the under-dash fuse/relay box connectors E, H and Q (see ).
   Fig 1: Identifying Wire Side Of Female Terminal

   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 under-dash fuse/relay box. Turn the ignition switch ON (II) and make these input tests at the appropriate connectors on the 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.
     TEST POSSIBLE CAUSE (1 OF 2)
     
     

     Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
     E15	GRN	Driver's door open	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door switch An open in the wire
     		Driver's door closed	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door switch Short to ground
     H12	LT GRN/RED	Front passenger's door open	Check for 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	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door switch Short to ground
     E14	GRN/YEL	Left rear door open	Check for voltage to ground: There should be less than 1 V.	Faulty left rear door switch An open in the wire
     		Left rear door closed	Check for voltage to ground: There should be 5 V or more.	Faulty left rear door switch Short to ground
     H13	GRN/WHT	Right rear door open	Check for voltage to ground: There should be less than 1 V.	Faulty right rear door switch An open in the wire
     		Right rear door closed	Check for voltage to ground: There should be 5 V or more.	Faulty right rear door switch Short to ground
     Q7	BLU/YEL	In-bed trunk lid open	Check for voltage to ground: There should be less than 1 V.	Poor ground(G601) Faulty in-bed trunk lid latch switch An open in the wire
     		In-bed trunk lid closed	Check for voltage to ground: There should be 5 V or more.	Faulty in-bed trunk lid latch switch Short to ground
     Q11	BLU/ORN	Tailgate open	Check for voltage to ground: There should be less than 1 V.	Poor ground (G602) Faulty tailgate switch An open in the wire
     		Tailgate closed	Check for voltage to ground: There should be 5 V or more.	Faulty tailgate switch Short to ground

Gauge Control Module 

6. Turn the ignition switch OFF.
7. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).
8. Disconnect the gauge control module connectors A (20P) and C (20P).
   Fig 2: Identifying Gauge Control Module Connector

   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 connectors to the gauge control module, turn the ignition switch 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.
    TEST POSSIBLE CAUSE (2 OF 2)
    
    

    Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
    A20	YEL	Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire
    A19	WHT/RED	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire
    A10	BLK	Under all conditions	Check for voltage to ground: There should be battery voltage.	Poor ground (G401) An open in the wire
    C10	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V,	Poor ground (G402) An open in the wire

11. If all the input tests prove OK, and no DTCs were found during MICS 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 DEVICE CONTROL ). 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 particular control unit, replace the control unit.