Duramax Diesel. Manual - part 30

Vehicle Care

119

Relays

Usage

15

Run/Crank

37

NOx sensors

38

Fuel pump

39

Crank

40

A/C

48

EV fan clutch

49

Powertrain

57

Cooling fan–low

60

Cooling fan control

K3

Wipers–high

K5

Horn/Washer

K6

Low-beam
headlamps

K7

High-beam
headlamps

K9

Left trailer
stoplamp/Turnlamp

K11

Stoplamps

K13

Wipers

K18

Right trailer
stoplamp/Turnlamp

Relays

Usage

K19

Daytime running
lamps

MR Rel 1

Fuel filter heater

MR Rel 2

Diesel exhaust fluid
power/Wake up

120

Vehicle Care

8-Cylinder Pickup

The vehicle may not be equipped
with all of the fuses, relays, and
features shown.

Fuses

Usage

1

Trailer brake

Fuses

Usage

2

Trailer battery

3

ABS pump

4

Instrument
panel BEC 1

5

MSB passenger

6

4WD transfer case
electronic control

7

Electric parking
brake

8

Instrument
panel BEC 2

9

MSB driver

10

Rear window
defogger

11

Starter

12

Cooling fan 1

13

Cooling fan 2

14

Left trailer stop/
Turn lamps

15

Trailer parking
lamps

16

Trailer reverse
lamps

Vehicle Care

121

Fuses

Usage

17

Right trailer stop/
Turn lamps

18

Fuel pump

19

Integrated chassis
control module

20

ESC ELC EXH

21

Fuel pump power
module

22

Upfitter 1

23

Upfitter 2

24

Front wiper

25

ABS Valves

26

Upfitter 2

27

Upfitter 3

28

Right parking
lamps

29

Left parking lamps

30

Upfitter 3

31

Upfitter 4

32

Upfitter 4

33

Reverse lamps

Fuses

Usage

34

Engine control
module/Ignition

35

A/C clutch

36

Heated mirrors

37

Upfitter 1

38

Center
high-mounted
stoplamp

39

Miscellaneous/
Ignition

40

Transmission/
Ignition

41

Fuel pump 2

42

Cooling fan clutch

43

Engine

44

Fuel
injectors A–odd

45

Fuel
injectors B–even

46

Afterboil

47

Throttle control

48

Horn

Fuses

Usage

49

Fog lamps

50

O2 Sensor A

51

Engine control
module

52

Interior heater

53

Police upfitter

54

Front washer

55

A/C compressor
module

56

SCRPM/SEN ENB

57

Transmission
control module/
Engine control
module

58

Headlamps

74

Electric running
boards (if
equipped)

80

LVL EXH SOL

81

Diesel exhaust fluid
heater

82

Fuel heater

84

TIM

122

Vehicle Care

Fuses

Usage

85

Fuel heater

86

EURO TRLR R/C

Relays

Usage

59

Fuel pump

60

Upfitter 2

61

Upfitter 3

62

Upfitter 4

63

Trailer parking
lamps

64

Run/Crank

65

Upfitter 1

66

Fuel pump 2

67

A/C control

68

Starter

69

Rear window
defogger

70

Engine control
module

71

Cooling fan clutch

72

CKT 95

Relays

Usage

73

CKT 92

75

Fuel heater

78

Diesel exhaust fluid
heater

79

PT sensor

Appearance Care

Exterior Care

See the owner’s manual for
additional exterior care information.

Caution

Water sprayed into or on the air
intake box in the engine
compartment may damage the air
filter or electrical components. Do
not spray water into or on the air
intake box.