Control Unit Input Test - Honda 2004 Odyssey Service Manual

A/T Interlock System

Control Unit Input Test

SRS components are located in this area. Review the SRS component locations, 2002 model (see page 23-19), 2003-
2004 models (see page 23-20), and the precautions and the procedures (see page 23-21) in the SRS before performing
repairs or service.
1. Disconnect the 22P connector from the multiplex control unit, driver's, then remove the control unit from the
driver's under-dash fuse/relay box.
2. Inspect the connectors and connector 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 3.
NOTE: If the shift lock solenoid clicks when the ignition switch is turned ON (II) while pressing the brake pedal with
the shift lever in the P position, the shift lock system is OK. If the shift lever cannot be shifted from the P position,
test the transmission range switch.
3. With the control unit still disconnected from its connectors and the fuse/relay box, make these input tests.
• If a test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, go to step 4.
Multiplex Control Unit, Driver's, Connector A (24P)
Cavity Wire Color
A2
A12
A15
Multiplex Control Unit, Driver's, Connector B (22P)
Cavity Wire Color
B11 BLK
B22 GRN
4. Reconnect the connectors to the multiplex control unit, and make this input test.
• If a test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, substitute a known-good multiplex control unit, and recheck the system.
If the system is OK, the multiplex control unit must be faulty; replace it.
Cavity Wire Color
B12 WHT/RED
14-414
Test Condition
Under all Check for continuity to ground:
conditions There should be continuity.
Ignition switch Check for voltage to ground:
turned ON (II) There should be battery voltage.
Shift lever in P Check for continuity to ground:
There should be continuity.
Test Condition
Under all Check for continuity to ground:
conditions There should be continuity.
Ignition switch Check for voltage to ground:
ON (II) There should be battery voltage.
Test Condition
Ignition switch Check for voltage to ground:
ON (II) and brake There should be battery voltage.
pedal pushed
Ignition switch Check for voltage to ground:
ON (II), brake pedal There should be 1 V or less.
and accelerator
pedal pressed at
the same time
Test: Desired Result
Test: Desired Result
Test: Desired Result
Possible Cause(If result is not obtained)
• Poor ground (G401)
• An open in the wire
• Blown No. 9 (10A) fuse in the
driver's under-dash fuse/relay
box
• An open in the wire
• Faulty transmission range
switch
• Poor ground (G101)
• An open in the wire
Possible Cause(If result is not obtained)
• Poor ground (G401)
• An open in the wire
• Blown No. 9 (10A) fuse in the
driver's under-dash fuse/relay
box
• Faulty shift lock solenoid
• An open in the wire
Possible Cause(If result is not obtained)
• Faulty brake pedal position
switch
• Faulty PCM
• Faulty multiplex control unit
(driver's)
• An open in the wire