Driver's Multiplex Control Unit
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box, and disconnect its connector.
- Inspect all 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.
- With the driver's multiplex control unit still disconnected, 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, driver's multiplex control unit must be faulty; replace it.CONTROL UNIT INPUT TEST (WITHOUT AUTOMATIC WIPER)
Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained B11(1) BLK Under all conditions Check for continuity to ground:
There should be continuity.- Poor ground (G501)
- An open in the wire
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 under-dash fuse/relay box
A3 Shift lever in P Check for continuity to ground:
There should be continuity.- Faulty transmission range switch
- An open in the wire
A8 Brake pedal pressed Check for voltage to ground:
There should be battery voltage.- Blown No. 47 (20 A) fuse in the under-hood fuse/relay box
- Faulty brake pedal position switch
- An open in the wire
B14(1) BLU/WHT Under all conditions Check for continuity between the B14 terminal and No. 26 terminal of the PCM 32P connector B:
There should be continuity.An open in the wire B15(1) GRN/WHT(2)
GRN/RED(3)Parking brake pedal pressed Check for continuity to ground:
There should be continuity.- Faulty parking brake switch
- An open in the wire
B9(1) GRN/YEL Intermittent dwell time control ring turned Check resistance between the terminals:
It should vary from 0 to about 30 k ohm as the ring is turned.- Faulty intermittent dwell time controller
- An open in the wire
B10(1) GRN/WHT A9 Fuse/relay box socket Ignition switch ON (II) and wiper switch in INT Check for voltage to ground:
There should be battery voltage.- Blown No. 11 (10 A) fuse in the driver's under-dash fuse/relay box
- Faulty wiper switch
- Faulty driver's under-dash fuse/relay box
- An open in the wire
A11 Ignition switch ON (II) and INT switch OFF Check for voltage to ground:
There should be battery voltage.- Blown No. 12 (30 A) fuse in the driver's under-dash fuse/relay box
- Faulty intermittent wiper relay
- Faulty driver's under-dash fuse/relay box
- An open in the wire
A21 Ignition switch ON (II) and washer switch ON Check for voltage to ground:
There should be battery voltage.- Blown No. 11 (10 A) fuse in the driver's under-dash fuse/relay box
- Faulty washer switch
- Faulty driver's under-dash fuse/relay box
- An open in the wire
A23 Ignition switch ON (II) and wiper in PARK position Check for voltage to ground:
There should be battery voltage.- Blown No. 12 (30 A) fuse in the driver's under-dash fuse/relay box
- Faulty wiper motor
- Faulty driver's under-dash fuse/relay box
- An open in the wire
(1) Driver's multiplex control unit connector B (2) '03 model (3) '04-'06 models