Control Unit Input Test
WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
- Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
- Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
- 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 driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the back of the driver's under-dash fuse/relay box. For driver's under-dash fuse/relay box connector socket location (see
DRIVER'S 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 5.REFERENCE CHART (DRIVER'S MULTIPLEX CONTROL UNIT CONNECTED TO THE DRIVER'S UNDER-DASH FUSE/RELAY BOX)
Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 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
E3 GRN/ORN 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
M9 BLU/BLK Ignition key is in the ignition switch Check for voltage to ground:
There should be less than 1 V.- Faulty ignition 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 switch
- Short to ground
M3 RED/BLK Combination light switch ON Check for voltage to ground:
There should be battery voltage.- 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 under-dash fuse/ relay box
- An open in the wire
(1) Multiplex control unit connector B
- Remove the driver's multiplex control unit from the driver's multiplex control unit and make these input tests at the connector and driver's under-dash fuse/relay box sockets.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to GAUGE CONTROL MODULE INPUT TEST (see
).REFERENCE CHART (DRIVER'S MULTIPLEX CONTROL UNIT DISCONNECTED TO THE DRIVER'S UNDER-DASH FUSE/RELAY BOX)
Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A24 Fuse/relay box socket 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
A12 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
A1 Under all conditions Attach to ground:
The ignition key light should come on.- Blown No. 47 (20 A) fuse in the under-hood fuse/relay box
- Faulty ignition key light
- An open in the wire