Operating Instructions: 3-6
Table 3-1. GM Throttle Controller LED Functions
LED STATUS INDICATION
BUSS On Solid Unit ON and functioning
(harness connected to data
link)
BUSS Flashing Unit ON, but a problem was
detected
GEAR On Solid Transmission in PARK
GEAR Flashing Transmission NOT in Park
PK BRK On Solid Parking Brake Set
PK BRK Flashing Parking Brake is NOT set
SR BRK On Solid Service Brake is set (not
being used)
SR BRK Flashing Service Brake is NOT set
VSPEED On Solid Vehicle is stationary
VSPEED Flashing Vehicle is moving
RPM1 On Solid RPM1 mode selected, engine
at fast idle
RPM1 Flashing RPM1 mode selected, engine
not at fast idle
RPM2 On Solid RPM2 mode selected, engine
at fast idle
RPM2 Flashing RPM2 mode selected, engine
not at fast idle
RPM3 On Solid RPM3 mode selected, engine
at fast idle
RPM3 Flashing RPM3 mode selected, engine
not at fast idle
On GM gas engine vehicles, the PCM engine computer will cause the engine
speed to momentarily drop back to normal idle speed every time the air conditioner
pump cycles on or o. Make sure the operator of the CDS understands that the
AC / HEAT switch needs to be in the OFF position before activating the CDS unit.
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