Control Unit Input Test

Driver's MICU 

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER 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 D (16P), Q (20P) & R (24P) Connector End Views

   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 step 5.
5. Reconnect the connectors, turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, 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
   Q1	BLK	In all ignition switch positions or all power modes	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
   Q2	BRN	In all ignition switch positions or all power modes	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
   R2	BRN	In all ignition switch positions or all power modes	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
   R5	BLK	In all ignition switch positions or all power modes	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
   D12	GRN	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
   D4	LT GRN	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 about 5 V.	Faulty left rear door switch A short to ground in the wire
   D5	WHT	Trunk lid open (Remove the trunk light bulb)	Measure the voltage to ground: There should be less than 0.2 V.	Faulty trunk lid latch switch Poor ground (G603) or an open in the ground wire An open or high resistance in the wire
   		Trunk lid closed (Remove the trunk light bulb)	Measure the voltage to ground: There should be about 5 V.	Faulty trunk lid latch switch A short to ground in the wire
   Q18(1)	BRN	Remote key inserted into the Remote slot	Measure the voltage to ground: There should be less than 0.2 V.	Faulty Remote slot Faulty power control unit Poor ground (G402) or an open in the ground wire An open or high resistance in the wire
   		Remote key removed from the Remote slot	Measure the voltage to ground: There should be about 5 V.	Faulty Remote slot Faulty power control unit A short to ground in the wire
   Q18(2)	BRN	Ignition key inserted into the ignition switch	Measure the voltage to ground: There should be less than 0.2 V.	Faulty ignition key switch Poor ground (G403) or an open in the ground wire An open or high resistance in the wire
   		Ignition switch in LOCK (0) position and 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
   R6 • R3	PNK • BLK	Combination light switch OFF	Measure the voltage between terminals R6 and R3: 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 R6 and R3: There should be about 5 V.	Faulty combination light switch A short to ground in the wire
   R7 • R3	GRY • BLK	Combination light switch (PARKING position) ON	Measure the voltage between terminals R7 and R3: 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 R7 and R3: There should be about 5 V.	Faulty combination light switch A short to ground in the wire
   R8 • R3	BRN • BLK	Combination light switch (Headlight position) ON	Measure the voltage between terminals R8 and R3: 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 R8 and R3: There should be about 5 V.	Faulty combination light switch A short to ground in the wire
   (1) With keyless access system (2) Without keyless access system

   Passenger's MICU 

6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Remove the passenger's side kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
8. Disconnect passenger's under-dash fuse/relay box connectors A, E, and G^*1 (or H^*2 ).

   *1: With SH-AWD

   *2: Without SH-AWD

   NOTE: All connector views are wire side of female terminals.
   Fig 2: Identifying Passenger's Under-Dash Fuse/Relay Box A (38P), E (18P), G (16P) (w/o SH-AWD) & H (38P) (w/ SH-AWD) Connector End Views

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. 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 10.
10. Reconnect the connectors to the passenger's 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 11.

    Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
    A14	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 Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
    A35	BRN	Ignition switch ON (II), or power mode ON	Measure the voltage to ground: There should be battery voltage.	Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
    A36	BLK	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G405) An open or high resistance in the ground wire
    A37	GRY	In all ignition switch positions or all power modes	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
    E15	BLK	In all ignition switch positions or all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G203) An open or high resistance in the ground wire
    G15(1) or H3(2)	LT BLU	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 about 5 V.	Faulty front passenger's door switch A short to ground in the wire
    G14(1) or H25(2)	LT 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 about 5 V.	Faulty right rear door switch A short to ground in the wire
    (1) Without SH-AWD (2) With SH-AWD

    Gauge Control Module 

11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), and disconnect the 32P connector from it.
    Fig 3: Identifying Gauge Control Module 32P Connector End View

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. 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 step 14.
14. Reconnect the connector to the gauge control module, turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, 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 15.

    Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
    16	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 Faulty driver's under-dash fuse/relay box An open or high resistance in the wire
    15	BRN	Ignition switch ON (II), or power mode ON	Measure the voltage to ground: There should be battery voltage.	Faulty driver's under-dash fuse/relay box Blown No. 12 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
    1	GRY	In all ignition switch positions or all power modes	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
    7	LT GRN	Parking brake lever pulled	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 lever released	Measure the voltage to ground: There should be battery voltage.	Faulty parking brake switch A short to ground in the wire

15. 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 step 16.
    • 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 ).
16. 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 driver's MICU is faulty; replace the driver's under-dash fuse/relay box (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION ).