Control Unit Input Test

Driver's Unit 

• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, go to step 4.

  DRIVER'S UNDER-DASH FUSE/RELAY BOX SOCKET 

  (Driver's multiplex control unit connector A)

  Fig 1: Identifying Driver's Multiplex Control Unit Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  DRIVER'S MULTIPLEX UNIT CONNECTOR B 

  Fig 2: Identifying Driver's Multiplex Unit Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR E 

  Fig 3: Identifying Driver's Under-Dash Fuse/Relay Box Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  DRIVER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR M 

  Fig 4: Identifying Driver's Under-Dash Fuse/Relay Box Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  *: EX and EXL 

• 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 5.
  RESULT REFERENCE CHART (DRIVER'S MULTIPLEX CONTROL UNIT CONNECTOR DISCONNECTED AND DRIVER'S UNDER-DASH FUSE/RELAY BOX SOCKETS)
  
  

  Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
  A12	Fuse/relay box socket	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box Faulty driver's fuse/relay box An open in the wire
  A24		Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box Faulty driver's fuse/relay box
  A(1)		Under all conditions	Attach to ground: The security indicator should come on.	Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box Faulty security indicator Faulty driver's fuse/relay box An open in the wire
  A22 (2)		Connect B16 to battery voltage and A22 to ground	The parking lights and dash lights should come on.	Blown No. 10 (15 A) fuse in the passenger's under-dash fuse/relay box Faulty taillight relay Faulty driver's fuse/relay box An open in the wire
  B16(1)(2)	RED/GRN	Combination light switch OFF	Check for continuity to ground: There should be no continuity.	Faulty taillight relay Faulty combination light switch Faulty driver's fuse/relay box An open in the wire A short to ground in the wire
  		Combination light switch ON and jump B16 to battery voltage	The parking lights and dash lights should come on.	Blown No. 10 (15 A) fuse in the passenger's under-dash fuse/relay box Faulty taillight relay Faulty combination light switch Faulty driver's fuse/relay box An open in the wire
  (1) Driver's multiplex control unit connector B (2) EX and EXL

For driver's under-dash fuse/relay box connector socket location (see CONNECTOR TO FUSE/RELAY BOX INDEX ).

• 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.
  RESULT REFERENCE CHART (DRIVER'S MULTIPLEX CONTROL UNIT CONNECTED TO DRIVER'S UNDER-DASH FUSE/RELAY BOX)
  
  

  Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
  B2(1)(2)	GRN/BLK	Wake up the multiplex system by locking all doors and tailgate with the power door lock switch; Left rear door lock knob switch unlocked	Check for voltage to ground: There should be 1 V or less.	Poor ground (G601) Faulty left rear door lock knob switch An open in the wire
  		Wake up the multiplex system by locking all doors and tailgate with the power door lock switch; 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 A short to ground in the wire
  B6 (1)(2)	YEL	Hood open	Check for voltage to ground: There should be 1 V or less.	Poor ground (G201) Faulty hood switch An open in the wire
  		Hood closed	Check for voltage to ground: There should be 5 V or more.	Faulty hood switch A short to ground in the wire
  B8 (1)	ORN	Tailgate open	Check for voltage to ground: There should be 1 V or less.	Poor ground (G652) Faulty tailgate latch switch An open in the wire
  		Tailgate closed	Check for voltage to ground: There should be 5 V or more.	Faulty tailgate latch switch A short to ground in the wire
  E3	GRN/ORN	Driver's door open	Check for voltage to ground: There should be 1 V or less.	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 A short to ground in the wire
  E10	LT GRN/BLK	Left rear door open	Check for voltage to ground: There should be 1 V or less.	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 A short to ground in the wire
  M9	BLU/BLK	Ignition key is in the ignition switch	Check for voltage to ground: There should be 5 V or more.	Poor ground (G401) Faulty ignition key switch An open in the wire
  		Ignition key is out of the ignition switch	Check for voltage to ground: There should be less than 1 V.	Faulty ignition key switch A short to ground in the wire
  B11(1)	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G501) An open in the wire
  (1) Driver's multiplex control unit connector B (2) EX and EXL

  Passenger's Unit 

• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, go to step 8.

  PASSENGER'S UNDER-DASH FUSE/RELAY BOX SOCKET 

  Fig 5: Identifying Passenger's Under-Dash Fuse/Relay Box Socket Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  PASSENGER'S MULTIPLEX CONTROL UNIT CONNECTOR B 

  Fig 6: Identifying Passenger's Multiplex Control Unit Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  PASSENGER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR C 

  Fig 7: Identifying Passenger's Under-Dash Fuse/Relay Box Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  PASSENGER'S UNDER-DASH FUSE/RELAY BOX CONNECTOR E 

  Fig 8: Identifying Passenger's Under-Dash Fuse/Relay Box Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  *: EX and EXL 

• 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 9.
  RESULT REFERENCE CHART (PASSENGER'S MULTIPLEX CONTROL UNIT DISCONNECTED, MAKE INPUT TESTS AT CONNECTORS AND PASSENGER'S UNDER-DASH FUSE/RELAY BOX SOCKETS)
  
  

  Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
  A8	Fuse/relay box socket	Under all conditions	Check for continuity to ground: There should be continuity.	Poor ground (G651) Faulty passenger's fuse/relay box An open in the wire
  A9(2)		Under all conditions	Attach to ground: Horns should sound.	Blown No. 47 (20 A) fuse in the under-hood fuse/relay box Faulty passenger's fuse/relay box Faulty horn relay Faulty horn An open in the wire
  A20		Under all conditions	Attach to ground: Headlights should come on.	Faulty headlight relay 1 or 2 Faulty passenger's fuse/relay box An open in the wire
  A22		Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box Faulty driver's fuse/relay box Faulty passenger's fuse/relay box An open in the wire
  A23		Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 12 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty passenger's fuse/relay box
  A24		Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box Faulty passenger's fuse/relay box
  A10	Fuse/relay box socket	Jump A10 to battery voltage and B11 to body ground.	Check driver's door lock operation: The door should lock.	Faulty driver's door lock actuator Faulty passenger's fuse/relay box An open in the wire
  B11(1)	YEL
  A10	Fuse/relay box socket	Jump A10 to battery voltage and A11 to body ground.	Check passenger's doors lock operation: The doors should lock.	Faulty passenger's door lock actuator Faulty passenger's fuse/relay box An open in the wire
  A11			Check tailgate lock operation: The tailgate should lock.	Faulty tailgate lock actuator Faulty passenger's fuse/relay box An open in the wire
  B21 (1)	BLU	Under all conditions	Check for continuity to ground: There should be continuity.	Poor ground (G504) Faulty connections at the audio unit, DVD player, rear controller and screen, navigation display unit Faulty audio unit, DVD player, rear controller and screen, navigation display unit Faulty passenger's fuse/relay box An open in the wire
  (1) Passenger's multiplex control unit connector B (2) EX and EXL

For passenger's under-dash fuse/relay box connector socket location (see CONNECTOR TO FUSE/RELAY BOX INDEX ).

• 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.
  RESULT REFERENCE CHART (PERFORM FOLLOWING INPUT TESTS AT APPROPRIATE CONNECTORS ON PASSENGER'S UNDER-DASH FUSE/RELAY BOX)
  
  

  Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
  C8 (2)	RED/BLU NOTE: Front passenger's door lock knob switch in the locked position	Wake up the multiplex system by locking all doors and tailgate with the power door lock switch; Right rear door lock knob switch unlocked	Check for voltage to ground: There should be 1 V or less.	Poor ground (G651) Faulty right rear door lock actuator An open in the wire
  		Wake up the multiplex system by locking all doors and tailgate with the power door lock switch; Right rear door lock knob switch locked	Check for voltage to ground: There should be 5 V or more.	Faulty right rear door lock actuator A short to ground in the wire
  E2 ()	GRN/RED NOTE: Right rear door lock knob switch in the locked position	Wake up the multiplex system by locking all doors and tailgate with the power door lock switch; Front passenger's door lock knob switch unlocked	Check for voltage to ground: There should be 1 V or less.	Poor ground (G651) Faulty front passenger's door lock actuator An open in the wire
  		Wake up the multiplex system by locking all doors and tailgate with the power door lock switch; 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 actuator A short to ground in the wire
  B21 (1)	BLU	Under all conditions	Check for voltage to ground: There should be battery voltage.	Poor ground (G504) Poor connection at audio unit, DVD player, rear controller and screen, navigation display unit Faulty audio unit, DVD player, rear controller and screen, navigation display unit An open in the wire
  B22 (1)	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G503) Faulty passenger's fuse/relay box An open in the wire
  (1) Passenger's multiplex control unit connector B (2) EX and EXL

  RESULT REFERENCE CHART (PERFORM FOLLOWING INPUT TESTS AT APPROPRIATE CONNECTORS ON PASSENGER'S UNDER-DASH FUSE/RELAY BOX)
  
  

  Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
  C14	GRN/WHT	Right rear door open	Check for voltage to ground: There should be 1 V or less.	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 A short to ground in the wire
  C16	GRN	Front passenger's door open	Check for voltage to ground: There should be 1 V or less.	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 A short to ground in the wire
  E5	BLU/ORN	Front passenger's door lock switch in UNLOCK	Check for voltage to ground: There should be 1 V or less.	Poor ground (G652) Faulty front passenger's door lock switch An open in the wire
  		Front passenger's door lock switch in neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door lock switch A short to ground in the wire
  E6	BLK/ORN	Front passenger's door lock switch in LOCK	Check for voltage to ground: There should be 1 V or less.	Poor ground (G651) Faulty front passenger's door lock switch An open in the wire
  		Front passenger's door lock switch in neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty front passenger's door lock switch A short to ground in the wire
  E7	BLK/RED	Front passenger's door key cylinder switch in UNLOCK	Check for voltage to ground: There should be 1 V or less.	Poor ground (G651) Faulty or misadjusted front passenger's door key cylinder switch An open in the wire
  		Front passenger's door key cylinder switch in neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty or misadjusted front passenger's door key cylinder switch An open in the wire
  E3	BLU/GRN	Front passenger's door key cylinder switch in LOCK	Check for voltage to ground: There should be 1 V or less.	Poor ground (G651) Faulty or misadjusted front passenger's door key cylinder switch An open in the wire
  		Front passenger's door key cylinder switch in neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty or misadjusted front passenger's door key cylinder switch A short to ground in the wire
  B8(1)	RED/BLK	Tailgate key cylinder switch in UNLOCK	Check for voltage to ground: There should be 1 V or less.	Poor ground (G652) Faulty or misadjusted tailgate key cylinder switch An open in the wire
  		Tailgate key cylinder switch in neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty or misadjusted tailgate key cylinder switch A short to ground in the wire
  B7(1)	RED/WHT	Tailgate key cylinder switch in LOCK	Check for voltage to ground: There should be 1 V or less.	Poor ground (G652) Faulty or misadjusted tailgate key cylinder switch An open in the wire
  		Tailgate key cylinder switch in neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty or misadjusted tailgate key cylinder switch A short to ground in the wire
  (1) Passenger's multiplex control unit connector B

  Door Unit 

• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, go to step 12.
  Fig 9: Identifying Connector Terminals

  Courtesy of AMERICAN HONDA MOTOR CO., INC.

  *: EX and EXL 

• 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.
  RESULT REFERENCE CHART (DOOR MULTIPLEX CONTROL UNIT, DISCONNECTED)
  
  

  Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
  A1	WHT/RED	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box An open in the wire
  A12	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G401) An open in the wire
  A6(1)	BLU/WHT	Driver's door key cylinder switch in LOCK	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door key cylinder switch Poor ground (G401) An open in the wire Short to ground in the wire
  		Driver's door key cylinder switch in the neutral position	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.
  A16	BLU	Driver's door key cylinder switch in UNLOCK	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door key cylinder switch Poor ground (G401) An open in the wire Short to ground in the wire
  		Driver's door key cylinder switch in the neutral position	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.
  A7	PNK	Driver's door lock knob locked	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door lock actuator Poor ground (G401) An open in the wire
  		Driver's door lock knob unlocked	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock actuator Short to ground in the wire
  A17	BLK/RED	Driver's door lock knob unlocked	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door lock actuator Poor ground (G401) An open in the wire
  		Driver's door lock knob locked	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock actuator Short to ground in the wire
  A8	BLK/WHT	Driver's door lock switch in LOCK	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door lock switch Poor ground (G401) An open in the wire
  		Driver's door lock switch in the neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock switch Short to ground in the wire
  A18	GRN/RED	Driver's door lock switch in UNLOCK	Check for voltage to ground: There should be less than 1 V.	Faulty driver's door lock switch Poor ground (G401) An open in the wire
  		Driver's door lock switch in the neutral position	Check for voltage to ground: There should be 5 V or more.	Faulty driver's door lock switch Short to ground in the wire
  (1) EX and EXL