MICU Input Test

Driver's MICU 

1. Turn the ignition switch to LOCK (0)
2. Remove the driver's dashboard undercover (see DRIVER'S POCKET REMOVAL/INSTALLATION ), then remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION )
3. Disconnect driver's under-dash fuse/relay box connectors D, F, N, P, 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, F, N, P, Q, And R Terminals

   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. With the connectors still disconnected, do these input tests at the following connector
   • 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
   TROUBLESHOOT REFERENCE CHART
   
   

   Cavity	Wire	Test condition	Test Desired result	Possible cause if desired result is not obtained
   F11	WHT	Under all conditions	Measure the voltage to ground There should be battery voltage	Blown No 15 (10 A) fuse in the under-hood fuse/relay box An open in the wire
   F32	WHT	Under all conditions	Measure the voltage to ground There should be battery voltage	Blown No 9 (15 A) fuse in the under-hood fuse/relay box An open in the wire
   D7	GRN	Under all conditions	Connect terminals F32 and D7 with a jumper wire The right rear turn signal light should come on	Poor ground (G901) Blown bulb An open in the wire
   D13	BLU	Under all conditions	Connect terminals F32 and D13 with a jumper wire The left rear turn signal light should come on	Poor ground (G901) Blown bulb An open in the wire
   F1	BLU	Under all conditions	Connect terminals F32 and F1 with a jumper wire The left front turn signal light should come on	Poor ground (G302) Blown bulb An open in the wire
   P3	GRN	Under all conditions	Connect terminals F32 and P3 with a jumper wire The right front turn signal light and the right turn signal indicator should come on	Poor ground (G201) Blown bulb Faulty gauge control module Faulty indicator An open in the wire
   P14	BLU	Under all conditions	Connect terminals F32 and P14 with a jumper wire The left turn signal indicator should come on	Faulty gauge control module Faulty indicator An open in the wire Poor ground (G302)

6. Reconnect the connectors to the driver's under-dash fuse/relay box, and do these input tests at the connectors
   • If any test indicates a problem, find and correct the cause, then recheck the system
   • If all the input tests prove OK, the driver's MICU must be faulty, replace the driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION )
   TROUBLESHOOT REFERENCE CHART
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
   Q1	BLK	Under all conditions	Measure the voltage to ground There should be less than 0 5 V	Poor ground (G502) An open in the wire
   Q2	BRN	Under all conditions	Measure the voltage to ground There should be less than 0 5 V	Poor ground (G501) An open in the wire
   R2	BRN	Under all conditions	Measure the voltage to ground There should be less than 0 5 V	Poor ground (G501) An open in the wire
   R5	BLK	Under all conditions	Measure the voltage to ground There should be less than 0 5 V	Poor ground (G502) An open in the wire
   N7	WHT	Under all conditions	Measure the voltage to ground There should be battery voltage	Faulty driver's under-dash fuse/relay box A short to ground in the wire
   Q17	GRN	Hazard warning switch pressed	Measure the voltage to ground There should be battery voltage	Faulty hazard warning switch An open in the wire
   R13 R3	LT GRN BLK	Ignition switch ON (II), turn signal switch in left position	Measure the voltage between terminals R13 and R3 There should be less than 1 V	Faulty combination light switch An open in the wire
   		Ignition switch ON (II), turn signal switch in right or neutral position	Measure the voltage between terminals R13 and R3 There should be more than 5 V	Faulty combination light switch A short to ground in the wire
   R14 R3	BRN BLK	Ignition switch ON (II), turn signal switch in right position	Measure the voltage between terminals R14 and R3 There should be less than 1 V	Faulty combination light switch An open in the wire
   		Ignition switch ON (II), turn signal switch in left or neutral position	Measure the voltage between terminals R14 and R3 There should be more than 5 V	Faulty combination light switch A short to ground in the wire