19 - CDS 4.8 SV Owner’s Guide
Table 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 off (not being
used)
SR BRK
Flashing
Service Brake is depressed
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 speed up or increase or elevate and then drop back to
normal idle speed every time the air conditioner pump cycles on or off. 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.