Control Unit Input Test

MICU 

1. Turn the ignition switch to LOCK (0).
2. Remove the fuse access panel (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
3. Disconnect under-dash fuse/relay box connectors C, K, M, N, Q, and W.
   NOTE: All connector views are shown from wire side of female terminals.
   Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors C, K, M, N, Q, And W

   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, 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 6.
   WIRE SPECIFICATIONS
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   K10	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
   M16	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G502) or an open in the ground wire An open or high resistance in the wire
   N2	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
   Q9	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
   W1	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 60 (50 A) fuse in the under-dash fuse/relay box Faulty ignition switch An open or high resistance in the wire
   C33	GRY	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 or more.	Faulty driver's door switch A short to ground in the wire
   C32	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 or more.	Faulty front passenger's door switch A short to ground in the wire
   C40	GRN	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 or more.	Faulty right rear door switch A short to ground in the wire
   C26	PNK	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
   C22	ORN	Hatch open	Measure the voltage to ground: There should be less than 0.2 V.	Faulty hatch latch switch An open or high resistance in the wire
   		Hatch closed	Measure the voltage to ground: There should be at least 5 V.	Faulty hatch latch switch Poor ground (G801) or an open in the ground wire 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 ), and disconnect the 32P connector from it.
   Fig 2: Identifying Gauge Control Module 32P Connector Terminals

   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, 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 10.
   WIRE SPECIFICATIONS
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   1	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
   5	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
   15	LT BLU	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 22 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
   16	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 1 (15 A) fuse in the 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:
      • USA models (see REMOVAL AND INSTALLATION )
      • Canada models (see CANADA MODELS )