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, R, S, and T.
   NOTE: All connector views are shown in illustration from wire side of female terminals.
   Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors D, E, F, G, R, S, And T 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, 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 ground wire
   T34
   F20				Poor ground (G501) An open or high resistance in the ground wire
   D2	PNK	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Faulty ignition switch Faulty under-dash fuse/relay box 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
   R6	RED	Ignition key inserted into the ignition switch	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) or an open in the ground wire Faulty ignition key switch An open or high resistance in the wire
   		Ignition key removed from the ignition switch	Measure the voltage to ground: There should be at least 5 V.	Faulty ignition key switch A short to ground in the wire
   S1 . S5	ORN . BLK	Combination light switch OFF	Measure the voltage between terminals S1 and S5: 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 S1 and S5: There should be at least 5 V.	Faulty combination light switch A short to ground in the wire
   S13 . S5	GRY . BLK	Combination light switch (PARKING position) ON	Measure the voltage between terminals S13 and S5: 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 S13 and S5: There should be at least 5 V.	Faulty combination light switch A short to ground in the wire
   S11 . S5	LT GRN . BLK	Combination light switch (Headlight position) ON	Measure the voltage between terminals S11 and S5: 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 S11 and S5: There should be at least 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 Connector A (32P)

   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, 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
   21	BLK/YEL	Parking brake pedal pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty parking brake switch Faulty parking brake switch ground An open or high resistance in the wire
   		Parking brake pedal released	Measure the voltage to ground: There should be at least 5 V.	Faulty parking brake switch A short to ground in the wire

10. If the lights-on reminder has a problem, substitute a known-good under-dash fuse/relay box, and recheck the system. If the seat belt reminder has a problem, check for SRS DTCs and check the seat belt buckle switch. If all the tests prove OK, go to step 11.
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 (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 ).