Driver's Multiplex Control Unit

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.
  
  Fig 1: Identifying Under-Dash Fuse/Relay Box Socket
  Courtesy of AMERICAN HONDA MOTOR CO., INC.
  
  Fig 2: Identifying Driver's Multiplex Control Unit Connector B
  Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

Shift lever in P

Check for continuity to ground:
There should be continuity.

Faulty transmission range switch
An open in the wire

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

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