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Passenger's Multiplex Control Unit

  1. Remove right side kickpanel. Turn ignition switch to OFF position. Disconnect passenger's multiplex control unit Gray 26-pin and 22-pin connectors. See Fig 1 . See PASSENGER'S MULTIPLEX CONTROL UNIT CONNECTOR TERMINAL IDENTIFICATION table. Ensure terminals of both connectors are okay and making proper contact. Repair connector terminals as necessary and retest system. If connector terminals are okay, go to next step.
  2. Ensure ignition switch is in OFF position. Using an ohmmeter, probe between passenger's multiplex control unit Gray 26-pin connector terminals A2 (Black wire) and A3 (Black wire) and ground. If continuity exists, go to next step. If continuity does not exist, check for an open in Black wire and/or a bad ground connection.
  3. Ensure ignition switch is in OFF position. Using an ohmmeter, probe between passenger's multiplex control unit Gray 26-pin connector terminal A8 (Blue wire) and ground. If continuity exists, go to next step. If continuity does not exist, check audio unit (radio) operation. Check for an open in Blue wire and/or a bad ground connection. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  4. Turn ignition switch to ON position. Using a voltmeter, probe between Gray 26-pin connector terminal A14 (Yellow wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check fuse No. 13 (7.5-amp), located in fuse/relay box, under instrument panel. If fuse is okay, check for an open in Yellow wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  5. Turn ignition switch to OFF position. Using an ohmmeter, probe between passenger's multiplex control unit Gray 26-pin connector terminals B14 (Yellow/Black wire) and ground. Press remote transmitter PANIC button and check for continuity. If continuity exists, go to next step. If continuity does not exist, check remote transmitter, keyless entry receiver and window antenna operation. See Figure . See DOOR LOCKS - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If remote transmitter, keyless entry receiver and window antenna are all operational, check for an open in Yellow/Black wire and/or a bad ground connection.
  6. Turn ignition switch to OFF position. Reconnect driver's multiplex control unit Gray 22-pin and Gray 26-pin connectors. Using a voltmeter, backprobe between 26-pin connector terminal A7 (Green/Orange wire) and ground. Open and close hood and measure voltage. In closed position, voltage should be 5 volts or more. In open position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check hood switch. See HOOD SWITCH TEST under COMPONENT TESTS  . If hood switch is okay, check ground connections or for an open in Green/Orange wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  7. Using a voltmeter, backprobe between 26-pin connector terminal A21 (Blue/Red wire) and ground. Lock and unlock right front door lock knob and measure voltage. In LOCK position, voltage should be 5 volts or more. In UNLOCK position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check right front door lock actuator. See DOOR LOCKS - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If actuator is okay, check ground connections or for an open in Blue/Red wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  8. Using a voltmeter, backprobe between 26-pin connector terminal A23 (Green/Red wire) and ground. Open and close right front door and measure voltage. In closed position, voltage should be 5 volts or more. In open position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check right front door switch. See DOOR LOCK - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If door switch is okay, check ground connections or for an open in Green/Red wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  9. Using a voltmeter, backprobe between 22-pin connector terminal B5 (Blue/Green wire) and ground. Open and close trunk and measure voltage. In closed position, voltage should be 5 volts or more. In open position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check trunk switch. See TRUNK LATCH SWITCH TEST under COMPONENT TESTS  . If trunk switch is okay, check ground connection or for an open in Blue/Green wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  10. Using a voltmeter, backprobe between 22-pin connector terminal B7 (Red/Blue wire) and ground. Lock and unlock right rear door lock knob and measure voltage. In LOCK position, voltage should be 5 volts or more. In UNLOCK position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check right rear door lock switch. See DOOR LOCKS - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If switch is okay, check ground connections or for an open in Red/Blue wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  11. Using a voltmeter, backprobe between 22-pin connector terminal B9 (Green/Red wire) and ground. Turn right front door key cylinder to UNLOCK and NEUTRAL positions and measure voltage. In NEUTRAL position, voltage should be 5 volts or more. In UNLOCK position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check right front door lock key cylinder switch. See DOOR LOCKS - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If door switch is okay, check ground connections or for an open in Green/Red wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  12. Using a voltmeter, backprobe between 22-pin connector terminal B18 (Green/Orange wire) and ground. Open and close right rear door and measure voltage. In closed position, voltage should be 5 volts or more. In open position, voltage should be less than one volt. If voltage is as specified, go to next step. If voltage is not as specified, check right rear door switch. See DOOR LOCKS - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If door switch is okay, check ground connection or for an open in Green/Orange wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
  13. Using a voltmeter, backprobe between 22-pin connector terminal B20 (Green/White wire) and ground. Turn right front door key cylinder to LOCK and NEUTRAL positions and measure voltage. In NEUTRAL position, voltage should be 5 volts or more. In LOCK position, voltage should be less than one volt. If voltage is as specified, replace passenger's multiplex control unit. If voltage is not as specified, check right front door lock key cylinder switch. See DOOR LOCKS - POWER & TRUNK RELEASE article in the ACCESSORIES/SAFETY EQUIPMENT section. If door switch is okay, check ground connections or for an open in Green/White wire. See WIRING DIAGRAMS  . Repair as necessary and retest system.
Fig 1: Locating Passenger's Multiplex Control Unit Connector Terminals
G96I06119Courtesy of AMERICA HONDA MOTOR CO., INC.
PASSENGER'S MULTIPLEX CONTROL UNIT CONNECTOR TERMINAL IDENTIFICATION

Terminal (Wire Color) (1) Circuit
Gray 26-Pin Connector
A1 (WHT/YEL) Battery Input
A2 (BLK) Ground
A3 (BLK) Ground
A4 (BLK/RED) Front Passenger Power Window Control
A5 (YEL) Trunk Opener Main Switch Input
A6 (YEL/BLU) Rear Defogger ON Input
A7 (GRN/ORG) Hood Switch Input
A8 (BLU) Audio Unit (Radio) Input
A9 (RED/YEL) A-D Line
A10 (PNK/BLU) Wake-Up
A12 (WHT) Battery Input
A13 (WHT/RED) Driver's/Left Rear Door Lock Control
A14 (YEL) Ignition Input
A15 (RED) Dim Control
A16 (BLK) Ground
A17 (BLU/BLK) Front Passenger Power Window Control
A18 (YEL/RED) Engine Oil Pressure Input
A19 (YEL/GRN) Rear Defogger ON Output
A20 (WHT/BLU) Engine Running Input
A21 (BLU/RED) Front Passenger Knob Switch Input
A22 (BRN/WHT) D-A Line
A23 (GRN/RED) Front Passenger Door Switch Input
A25 (LT GRN/BLK) Driver's Door Lock Control
A26 (YEL/RED) Left Rear Door Lock Control
Gray 22-Pin Connector
B1 (WHT/RED) Front Passenger/Right Rear Door Lock Control
B3 (PNK/BLU) Trunk
B4 (RED/WHT) Lock
B5 (BLU/GRN) Trunk Latch Switch Input
B6 (YEL/GRN) Right Rear Power Window Control
B7 (RED/BLU) Right Rear Door Knob Switch Input
B8 (GRN/WHT) Front Passenger Door Lock Switch Input UNLOCK
B9 (GRN/RED) Front Passenger Door Lock Cylinder Switch Input UNLOCK
B10 (BLU/RED) Interior Light Control
B11 (WHT/BLK) Trunk Opener Solenoid Control
B12 (YEL/RED) Front Passenger/ Right Rear Door Lock Control
B14 (YEL/BLK) PCM "C"
B15 (GRN) Unlock
B17 (YEL) Right Rear Power Window Control
B18 (GRN/ORG) Right Rear Door Switch Input
B19 (GRN/RED) Front Passenger Door Lock Switch Input LOCK
B20 (GRN/WHT) Front Passenger Door Lock Cylinder Switch Input LOCK
B21 (LT GRN/BLK) Courtesy Light Control
B22 (PNK/BLK) Multiplex Check Connector Input
(1) Terminals not listed are not used.
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