Control Unit Input Test

MICU 

1. Turn the ignition switch to LOCK (0).
2. Remove the left front door sill trim and left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
3. Disconnect under-dash fuse/relay box connectors E, H, P and Q (see UNDER-DASH FUSE/RELAY BOX ).
   NOTE: All connectors are wire side of female terminals.
   Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors E, H, P And Q

   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 to ON (II) and do the 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.
   TEST CONDITION REFERENCE CHART
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   P1	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G403) An open or high resistance in the ground wire
   E9	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G501) An open or high resistance in the ground wire
   H9	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the ground wire
   E15	GRN	Driver's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's door switch An open or high resistance in the ground 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
   H12	LT GRN/RED	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch An open or high resistance in the wire
   		Front passenger's door closed	Measure the voltage to ground: There should be at least 5 V.	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 0.2 V.	Faulty left rear door switch An open or high resistance in the wire
   		Left rear door closed	Measure the voltage to ground: There should be at least 5 V.	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 0.2 V.	Faulty right rear door switch An open or high resistance in the wire
   		Right rear door closed	Measure the voltage to ground: There should be at least 5 V.	Faulty right rear door switch A short to ground in the wire
   Q7	BLU/YEL	In-bed trunk lid open	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) or an open in the ground wire Faulty in-bed trunk lid latch switch An open or high resistance in the wire
   		In-bed trunk lid closed	Measure the voltage to ground: There should be more than 5 V.	Faulty in-bed trunk lid latch switch A short to ground in the wire
   Q11	BLU/ORN	Tailgate open	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G602) or an open in the ground wire Faulty tailgate latch switch An open or high resistance in the wire
   		Tailgate closed	Measure the voltage to ground: There should be about 5 V.	Faulty tailgate latch 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 connectors A (20P) and C (20P).
   Fig 2: Identifying Gauge Control Module Connectors A (20P) And C (20P)

   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 to ON (II), and 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  11.
    TEST CONDITION REFERENCE CHART
    
    

    Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
    A10	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
    C10	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G402) An open or high resistance in the ground wire
    A19	WHT/RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
    A20	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire

11. 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 DEVICE CONTROLLED ). If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU) (see REMOVAL AND INSTALLATION ). If input failures are related to particular control unit, replace the control unit.