Multiplex Control Unit Input Test
WARNING: This page is about a different car, the 2006 Honda CR-V and 2005 Honda CR-V. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTAL ).
- Disconnect the under-dash fuse/relay box connectors C, E, F, J, K, 0, P, Q, X and Y.NOTE: All connectors are wire side of female terminals.
- 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 4.
- Reconnect the connectors to the under-dash fuse/relay box, and make sure 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, the multiplex control unit must be faulty, replace the under-dash fuse/relay box assembly.
MULTIPLEX CONTROL UNIT INPUT TESTCavity Wire Test condition Test: Desired result Possible cause if result is not obtained J4 BLK Under all conditions Check for voltage to ground:
There should be less than 1 V.- Poor ground (G301)
- An open in the wire
Y6 BLK Under all conditions Check for voltage to ground:
There should be less than 1 V.- Poor ground (G502)
- An open in the wire
J2 WHT/RED Under all conditions Check for voltage to ground:
There should be battery voltage.- Blown No. 9 (10A) fuse in the under-hood fuse/relay box
- An open in the wire
Q3 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
Q4 LT GRN/RED Passenger's door open Check for voltage to ground:
There should be less than 1 V.- Faulty passenger's door switch
- An open in the wire
Passenger's door closed Check for voltage to ground:
There should be 5 V or more.- Faulty passenger's door switch
- Short to ground
Q2 GRN/WHT Hatch glass open Check for voltage to ground:
There should be less than 1 V.- Poor ground (G601, G701)
- Faulty hatch glass latch switch
- An open in the wire
Hatch glass closed Check for voltage to ground:
There should be 5 V or more.- Faulty hatch glass latch switch
- Short to ground
Q8
*
C8
*
F1GRN/ORN
*
GRN/ORN
*
GRNParking brake lever pulled Check for voltage to ground:
There should be less than 1 V.- Faulty parking brake switch
- An open in the wire
Parking brake lever released Check for voltage to ground:
There should be 5 V or more.- Faulty parking brake switch
- Short to ground
Q5 BLU/RED Ignition switch ON (II), driver's seat belt is unbuckled. Check for voltage to ground:
There should be less than 1 V.- Faulty driver's seat belt buckle switch
- Poor ground (G551)
- An open in the wire
Ignition switch ON (II), driver's seat belt is buckled. Check for voltage to ground:
There should be 5 V or more.- Faulty driver's seat belt buckle switch
- Short to ground
P18 RED Tailgate open Check for voltage to ground:
There should be less than 1 V.- Faulty tailgate switch
- An open in the wire
Tailgate closed Check for voltage to ground:
There should be 5 V or more.- Faulty tailgate switch
- Short to ground
X5 RED/WHT Ignition key is in the ignition switch Check for voltage to ground:
There should be less than 1 V.- Faulty ignition key switch
- Poor ground (G401)
- An open in the wire
Ignition key is out of the ignition switch Check for voltage to ground:
There should be 5 V or more.- Faulty ignition key switch
- Short to ground
X8 WHT/BLK Under all conditions Attach to ground:
The ignition key light should come on.- Blown No. 3 (15A) fuse in the under-hood fuse/relay box
- Blown LED
- An open in the wire
07 GRN/RED Ceiling light switch in the middle position, all doors closed Attach to ground:
The ceiling light should come on.- Blown No. 3 (15A) fuse in the under-hood fuse/relay box
- Faulty ceiling light
- An open in the wire
C11 BLU Under all conditions Attach to ground:
Dash lights should come on.- Blown No. 6 (15A) fuse in the under-hood fuse/relay box
- Faulty taillight relay
- An open in the wire
F8 GRN Disconnect the brake fluid level switch 2P connector, and jump the GRN and BLK wires Check for voltage to ground:
There should be less than 1 V.- Faulty brake fluid level switch
- An open in the wire
Brake fluid level switch connector disconnected, jumper wire removed Check for voltage to ground:
There should be 5 V or more.- Faulty brake fluid level switch
- Short to ground
E10 YEL All doors, tailgate and hatch glass closed, ignition key removed Check for voltage to ground:
There should be battery voltage in the sleep mode and 3-7 V when awake.An open or short in the wire K10 GRY/RED All doors, tailgate and hatch glass closed, ignition key removed Check for voltage to ground:
There should be battery voltage in the sleep mode and 3-7 V when awake.An open or short in the wire K2 BLU/ORN Y1 BRN/YEL Under all conditions Check for continuity between the Y1 terminal and the No. 13 terminal of the VSA modulator-control unit:
There should be continuityAn open in the wire F9 BLU/WHT Under all conditions Check for voltage to ground:
There should be 5 V or more.An open or short in the wire