Acura RL (1996-2004 year). Manual - part 105
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138-1
Interlock System
How the Circuit Works
Key Interlock
Battery voltage is supplied at all times through fuse
39 to the key interlock switch. When you put the key
in the ignition, battery voltage is supplied to the key
interlock solenoid and the driver’s multiplex control
unit. When you move the A/T shift lever to PARK and
release the push button, the driver’s multiplex control
unit removes ground from the key interlock solenoid,
the solenoid is deenergized, and the key can be
removed from the ignition.
Shift Position Interlock
Battery voltage is supplied at all times through fuse
39 to the brake pedal position switch. With the
ignition in ON (II) or START (III), battery voltage is
supplied through fuse 20 to the shift lock solenoid.
When you push the brake pedal, battery voltage is
applied through the GRN/WHT wire to the
powertrain control module (PCM). If, at the same
time, you do not push the accelerator pedal, a low
voltage signal is sent through the RED/BLK wire to
the PCM. The PCM then applies voltage through
the WHT/GRN wire to the shift lock circuit in the
driver’s multiplex control unit. If the shift lever is in
the PARK position, the shift lock circuit provides
ground to the shift lock solenoid. The solenoid is
then energized and the shift lever can be moved
from the PARK position.
Refer to the Service Manual (Section 14, Automatic
Transmission) for specific tests or troubleshooting
procedures.
2004 American Honda Motor Co., Inc.
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