Control Unit Input Test

MICU 

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's dashboard lower cover (see INSTRUMENT PANEL REMOVAL/INSTALLATION ).
3. Disconnect under-dash fuse/relay box connectors D, E, F, G, and T.
   NOTE: All connector views are shown in illustration from wire side of female terminals.
   Fig 1: Identifying Connectors D (2P), E (42P), F (34P), G (21P) And T (34P) Terminals Identification

   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, 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 6.

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   E6	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 wire
   T34
   F20				Poor ground (G501) An open or high resistance in the wire
   D2	PNK	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Faulty under-dash fuse/relay box Faulty ignition switch An open or high resistance in the wire
   G2	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 23 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
   E37	YEL	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 at least 5 V.	Faulty driver's door switch A short to ground in the wire
   E3	LT GRN	Front passenger's door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty front passenger's door switch Faulty front passenger's door switch ground 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
   E17	LT BLU	Left rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty left rear door switch Faulty left rear door switch ground 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
   E2	GRY	Right rear door open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty right rear door switch Faulty right rear door switch ground 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
   E12	BLU	Hatch glass 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 hatch glass latch switch An open or high resistance in the wire
   		Hatch glass closed	Measure the voltage to ground: There should be at least 5 V.	Faulty hatch glass latch switch A short to ground in the wire
   E36+(1)	LT GRN	Tailgate 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 tailgate latch switch An open or high resistance in the wire
   		Tailgate closed	Measure the voltage to ground: There should be at least 5 V.	Faulty tailgate latch switch A short to ground in the wire
   (1) Without power tailgate

   Gauge Control Module 

6. Turn the ignition switch to LOCK (0).
7. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), and disconnect the 32P connector from it.
   Fig 2: Identifying Gauge Control Module 32P Connector

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. 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 9.
9. Reconnect the connector to the gauge control module, 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 10.

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   13	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
   16	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 23 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
   32	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Faulty under-dash fuse/relay box An open or high resistance in the wire

10. Substitute a known-good gauge control module, and recheck the system.
    • If the symptom is gone, the gauge control module is faulty; replace it (see GAUGE CONTROL MODULE REPLACEMENT ).
    • If the symptom is still present, the MICU is faulty; replace the under-dash fuse/relay box (see REMOVAL AND INSTALLATION ).