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Electrical Maintenance
85
Base Controller LEDs
The base controller has LEDs that indicate which
outputs are energized. The LED is illuminated
when the associated circuit output is energized.
Base Controller Relays
A number of relays are located on the base
controller. The relays control power to certain
loads. The base controller (see Figure 153) is
located inside the control box. Refer to the SR-4
Microprocessor Control System Diagnostic
Manual TK 55533 for a complete list of the size
and function of the relays.
Base Controller LED Functions
LED #
Function
LED 2
K3 High Speed Circuit
LED 4
K8 Run Relay Circuit
LED 5
K7 Diesel/Electric Relay Circuit
LED 6
K6 On/Off Relay Circuit
LED 7
K1 Starter Relay Circuit
LED 8
K2 Fuel Solenoid Relay Circuit
LED 9
K11 Preheat Relay Circuit
LED 10
Pilot Solenoid Circuit
LED 11
Purge Valve/Liquid Injection Valve
Circuits
LED 12
Hot Gas Bypass Valve Circuit
LED 13
Receiver Tank Pressure Solenoid Circuit
LED 14
Spare 1
LED 15
Spare 4
LED 16
Spare 3
LED 17
Spare 2
LED 23
Liquid Line Solenoid Circuit (MT)
LED 24
CIS/LV/Digital Scroll Circuits
LED 25
Suction Line Solenoid/Liquid Line
Economizer Valve Circuits
LED 26
Alternator Excite Circuit
LED 27
EFL (Evaporator Fan Low) Circuit
LED 29
EFH (Evaporator Fan High) Circuit
LED 30
CFR (Condenser Fan Roadside) Circuit
LED 32
CFC (Condenser Fan Curbside) Circuit
LED 35
LED 36
LED 37
ECU (Engine Control Unit) Key Switch
Circuit
LED 38
Battery Charger Enable Circuit
LED 39
LED 40
LED 41
LED 42
LED 43
K9 Electric Standby Motor Circuit
LED 44
K10 Auto Fresh Air Door Circuit
LED 45
LED 46
ETV – D*
LED 47
ETV – B*
LED 48
Heart Beat
LED 49
ETV – A*
LED 50
ETV – C*
* Illuminated when the respective ETV output is
energized. On applications without an ETV the ETV
LED's may be illuminated even though there is no
ETV present.
Relays
Relay
Function
K1
Starter Solenoid Relay
K2
Fuel Solenoid Pull-In Relay
K3
High Speed Relay
K6
On/Off Relay
K7
Diesel/Electric Relay (Optional)
K8
Run Relay
K9
Electric Standby Motor Relay (Optional)
K10
Fresh Air Exchange Relay (Optional)
K11
Preheat Relay
Base Controller LED Functions (Continued)
LED #
Function