Control Unit Input Test

Multiplex Integrated Control Unit 

1. Turn the ignition switch OFF.
2. Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
3. Disconnect the under-dash fuse/relay box connectors.
   NOTE: All connectors are wire side of female terminals.
   Fig 1: Identifying Connector

   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, make these input tests at the connectors.
   • If any test indicates a problem, find and correct the cause, then recheck the system.
   • If the input tests prove OK, go to step  6.
   CONTROL UNIT POSSIBLE CAUSE
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
   H9	BLK	Under all conditions	Check for continuity to ground: There should be continuity.	Poor ground (G503, G601) An open in the wire
   F5	BLU/BLK	Connect the F5 terminal to the battery positive terminal. Trunk lid opener main switch ON.	Check trunk lid opener solenoid operation: Trunk lid should open.	Poor ground (G701) Faulty trunk lid opener solenoid An open in the wire
   K2	YEL/GRN	Connect the battery positive terminal to K12 (K2) terminal, and K2 (K12) terminal to H9 terminal.	Check actuator operation: The driver's door lock actuator should lock (unlock).	Faulty driver's door lock actuator An open in the wire
   K12	YEL/BLK
   N7	YEL/BLK	Connect the battery positive terminal to N7 (N9) terminal, and N9 (N7) terminal to H9 terminal.	Check actuator operation: The front passenger's door lock actuator should lock (unlock).	Faulty front passenger's door lock actuator An open in the wire
   N9	YEL
   E2	YEL/BLK	Connect the battery positive terminal to E2 (E8) terminal, and E8(E2) terminal to H9 terminal.	Check actuator operation: The left rear door lock actuator should lock (unlock).	Faulty left rear door lock actuator An open in the wire
   E8	YEL
   H3	YEL/BLK	Connect the battery positive terminal to H3 (H10) terminal, and H10 (H3) terminal to H9 terminal.	Check actuator operation: The right rear door lock actuator should lock (unlock).	Faulty right rear door lock actuator An open in the wire
   H10	YEL
   Q14	WHT	Under all conditions	Apply battery power to Q14 terminal momentarily: The buzzer should chirp.	Poor ground (G302) Faulty buzzer An open in the wire

6. Reconnect all connectors to the under-dash fuse/relay box. Turn the ignition switch ON (II), and make these input tests at the appropriate connectors on the under-dash fuse/relay box.
   • 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  7.
   CONTROL UNIT POSSIBLE CAUSE
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
   Q8	BRN/WHT	Front passenger's door lock knob switch unlocked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G506) Faulty front passenger's door lock knob switch An open in the wire
   		Front passenger's door lock knob switch locked	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door lock knob switch Short to ground
   P9	PNK/BLU	Front passenger's door lock switch unlocked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G506) Faulty front passenger's door lock switch An open in the wire
   		Front passenger's door lock switch in neutral	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door lock switch Short to ground
   P25	PNK/BLK	Front passenger's door lock switch locked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G506) Faulty front passenger's door lock switch An open in the wire
   		Front passenger's door lock switch in neutral	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door lock switch Short to ground
   Q2	BLK/WHT	Left rear door lock knob switch unlocked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty left rear door lock knob switch An open in the wire
   		Left rear door lock knob switch locked	Check for voltage to ground: There should be 5 V or more.	Faulty left rear door lock knob switch Short to ground
   Q3	BLK/RED	Right rear door lock knob switch unlocked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G602) Faulty right rear door lock knob switch An open in the wire
   		Right rear door lock knob switch locked	Check for voltage to ground: There should be 5 V or more.	Faulty right rear door lock knob switch Short to ground

   CONTROL UNIT POSSIBLE CAUSE
   
   

   Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
   Q1	RED/WHT	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G504) Faulty connections at the audio unit Faulty audio unit An open in the wire
   P13	RED/WHT	Ignition key inserted into the ignition switch.	Check for voltage to ground: There should be less than 1 V.	Poor ground (G501) Faulty ignition key switch An open in the wire
   		Ignition switch OFF and ignition key removed from the ignition switch.	Check for voltage to ground: There should be 5 V or more.	Faulty ignition key switch Short to ground
   E15	GRN	Driver's door open	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door switch An open in the wire
   		Driver's door closed	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door switch Short to ground
   H12	LT GRN/ RED	Front passenger's door open	Check for voltage to ground: There should be less than 1 V.	Faulty front passenger's door switch An open in the wire
   		Front passenger's door closed	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door switch Short to ground
   E14	GRN/YEL	Left rear door open	Check for voltage to ground: There should be less than 1 V.	Faulty left rear door switch An open in the wire
   		Left rear door closed	Check for voltage to ground: There should be 5 V or more.	Faulty left rear door switch Short to ground
   H13	GRN/WHT	Right rear door open	Check for voltage to ground: There should be less than 1 V.	Faulty right rear door switch An open in the wire
   		Right rear door closed	Check for voltage to ground: There should be 5 V or more.	Faulty right rear door switch Short to ground
   P24	BLU/YEL	Trunk lid open	Check for voltage to ground: There should be less than 1 V.	Poor ground (G701) Faulty trunk lid latch switch An open in the wire
   		Trunk lid closed	Check for voltage to ground: There should be 5 V or more.	Faulty trunk lid latch switch Short to ground

   Door Multiplex Control Unit 

7. Turn the ignition switch OFF.
8. Remove the power window master switch (see REAR WINDOW MOTOR TEST ).
9. Disconnect the 22P connector from the power window master switch.
   Fig 2: Identifying Wire Side Female Terminal

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. 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  11.
11. With the connector still disconnected, make these input tests at the connector.
    • If the test indicates a problem, find and correct the cause, then recheck the system.
    • If the input tests prove OK, go to step  12.
    CONTROL UNIT POSSIBLE CAUSE
    
    

    Cavity	Wire	Test conditions	Test: Desired result	Possible cause if result is not obtained
    A10	BLK/YEL	Under all conditions	Attach to ground: The security indicator should come on.	Faulty security indicator An open in the wire
    A16	PNK/BLK	Under all conditions	Check for continuity between the A16 terminal and under-dash fuse/relay box connector J terminal No. 10: There should be continuity.	An open in the wire

12. Reconnect the connector to the door multiplex control unit. Turn the ignition switch ON (II) and make 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, go to step  13.
    CONTROL UNIT POSSIBLE CAUSE
    
    

    Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
    A7	WHT/BLK	Driver's door lock knob switch unlocked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty driver's door lock knob switch An open in the wire
    		Driver's door lock knob switch locked	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock knob switch A short to ground in the wire
    A6	YEL/RED	Driver's door lock knob switch locked	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty driver's door lock knob switch An open in the wire
    		Driver's door lock knob switch unlocked	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock knob switch A short to ground in the wire
    A14	WHT/BLU	Driver's door lock switch pressed (LOCK)	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty driver's door lock switch An open in the wire
    		Driver's door lock switch in neutral or pressed (UNLOCK)	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock switch A short to ground in the wire
    A15	WHT/GRN	Driver's door lock switch pressed (UNLOCK)	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty driver's door lock switch An open in the wire
    		Driver's door lock switch in neutral or pressed (LOCK)	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock switch A short to ground in the wire
    A18	WHT	Driver's door key cylinder switch in UNLOCK	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty driver's door key cylinder switch An open in the wire A short to ground in the wire
    		Driver's door key cylinder switch in neutral	Check for voltage to ground: There should be 5 V or more.	-
    		Driver's door key cylinder switch in LOCK	Check for voltage to ground: There should be 5 V or more.	-
    A19	WHT/RED	Driver's door key cylinder switch in LOCK	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503, G601) Faulty driver's door key cylinder switch An open in the wire A short to ground in the wire
    		Driver's door key cylinder switch in neutral	Check for voltage to ground: There should be 5 V or more.	-
    		Driver's door key cylinder switch in UNLOCK	Check for voltage to ground: There should be 5 V or more.	-

13. If all the input tests prove OK, and no DTCs were found during MICS troubleshooting (B-CAN System Diagnosis Test Mode A) (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), go to the B-CAN system input and output index (see B-CAN SYSTEM SWITCH DEVICE INDEX ). If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU). If input failures are related to a particular control unit, replace that control unit.