Control Unit Input Test

Driver's MICU 

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
3. Disconnect driver's under-dash fuse/relay box connectors D, Q, and R.
   NOTE: All connector views are wire side of female terminals.
   Fig 1: Identifying Driver's Under-Dash Fuse/Relay Box Connectors D, Q, And R

   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 are OK, go to next step.
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 next step.
   CONNECTOR INPUT TESTS REFERENCE
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
   Q10	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
   Q9	BRN	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
   R11	BRN	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
   R8	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
   D15	BRN	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 about 5 V.	Faulty driver's door switch A short to ground in the wire
   Q13	WHT	Ignition key inserted into the ignition switch	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G403) or an open in the ground wire Faulty ignition key switch An open or high resistance in the wire
   		Ignition switch LOCK (0), and the ignition key removed from the ignition switch	Measure the voltage to ground: There should be about 5 V.	Faulty ignition key switch A short to ground in the wire
   R7   R10	RED   BLK	Combination light switch OFF	Measure the voltage between terminals R7 and R10: There should be less than 0.2 V.	Faulty combination light switch An open or high resistance in the wire
   		Combination light switch in any other position than OFF	Measure the voltage between terminals R7 and R10: There should be about 5 V.	Faulty combination light switch A short to ground in the wire
   R6   R10	GRY   BLK	Combination light switch (PARKING position) ON	Measure the voltage between terminals R6 and R10: There should be less than 0.2 V.	Faulty combination light switch An open or high resistance in the wire
   		Combination light switch OFF	Measure the voltage between terminals R6 and R10: There should be about 5 V.	Faulty combination light switch A short to ground in the wire
   R5   R10	BRN   BLK	Combination light switch (Headlight position) ON	Measure the voltage between terminals R5 and R10: There should be less than 0.2 V.	Faulty combination light switch An open or high resistance in the wire
   		Combination light switch OFF	Measure the voltage between terminals R5 and R10: There should be about 5 V.	Faulty combination light 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 ), 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 are OK, go next step.
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 the input tests prove OK, go to next step.
   CONNECTOR INPUT TESTS REFERENCE
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   4	BRN	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
   1	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A15 (10 A) fuse in the under-hood fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
   17	BRN	Ignition switch ON (ID	Measure the voltage to ground: There should be battery voltage.	Blown No. B5 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
   26	LT GRN	Parking brake switch ON (Level pulled)	Measure the voltage to ground: There should be less than 0.2 V.	Faulty parking brake switch An open or high resistance in the wire
   		Parking brake switch OFF (Lever released)	Measure the voltage to ground: There should be about 5 V.	Faulty parking brake switch A short to ground in the wire

10. Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ), and check the beeper and the seat belt reminder indicator.
    • If the beeper sounds and the seat belt reminder indicator flashes, go to next step.
    • If the beeper does not sound or the seat belt reminder indicator does not flash, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).
11. Substitute a known-good gauge control module, and recheck the system.
    • If the symptom is gone, the gauge control module is faulty; replace it.
    • If the symptom is still present, the driver's MICU is faulty; replace the driver's under-dash fuse/relay box.
      • USA models (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION )
      • Canada models (see CANADA MODELS )