The Cadillac CT6, produced from 2016 to 2019, is a full-size luxury sedan renowned for its sophisticated design, advanced technology features, and powerful performance. Its electrical system, including the fuse box and relay components, plays a critical role in ensuring the vehicle’s smooth operation and reliability.

The fuse box in the Cadillac CT6 from 2016 to 2019 houses various fuses designed to protect specific electrical circuits throughout the vehicle. These circuits power essential components such as the engine control module, lighting systems, infotainment features, climate control, and more. Fuses are essential as they interrupt the electrical flow in case of an overload or short circuit, preventing damage to sensitive components.

Relays in the Cadillac CT6 act as electrically operated switches that control high-current circuits. They facilitate the precise activation and deactivation of functions like the starter motor, fuel pump, air conditioning compressor, and power windows or seats. Efficient management of power distribution by relays contributes significantly to the vehicle’s overall performance and reliability.

Regular inspection and maintenance of the fuse box and relays are necessary to ensure the Cadillac CT6 from 2016 to 2019 operates smoothly. This includes checking fuses for signs of wear or damage, ensuring secure relay connections, and promptly addressing any electrical issues that arise. Proper care of these components helps maintain the vehicle’s electrical integrity, enhancing safety and driving satisfaction for owners of the Cadillac CT6 from 2016 to 2019.

MUST READ: DYI – How to Check Car Fuses?

(2016-2019) Cadillac CT6 fuse box and relay with Diagram

WARNING

  • Never replace a fuse with one that has a higher amperage rating.
  • A fuse with a too-high amperage could damage the electrical part and cause a fire.
  • On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
  • If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
  • Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

Cadillac CT6 2016-2019 fuse assignment

  • Cigar lighter (power outlet) fuses in the Cadillac CT6 are the fuse №F1 (Power outlet) in the Instrument panel fuse box, fuses №F02 (Trunk power outlet) and №F41 (Rear seat power outlet) in the Luggage compartment fuse box (version 2 for 2018 – fuse №F53 (Rear seat auxiliary power outlet) and F77 (Trunk auxiliary power outlet) in the Luggage compartment fuse box).

Year of production: 2016, 2017, 2018

Passenger compartment

The location of the fuses in the passenger compartment: Cadillac CT6 (2016-2019-..)
Cadillac CT6 2016 2019 instrument cluster fuse box location

The fuse box is located in the instrument panel, behind the storage compartment to the left of the steering wheel.

Apply pressure to the two retaining tabs on the sides of the compartment, until the two retaining tabs clear the sides of the instrument panel. Allow the compartment to move downward, and out of the way.

Engine compartment

2.0L, 3.0L, and 3.6L: it is on the driver side.

The location of the fuses in the engine compartment: Cadillac CT6 (2016-2019-..)
The location of the fuses in the engine compartment: Cadillac CT6 (2016-2019-..)

The 4.2L engine has an underhood fuse block on each side of the engine compartment.

Cadillac CT6 2016 2019 en loc2 fuse box location
Cadillac CT6 2016 2019 en loc2 fuse box location

Luggage compartment

The location of the fuses in the trunk: Cadillac CT6 (2016-2019..)
The location of the fuses in the trunk: Cadillac CT6 (2016-2019..)

It is located on the right side of the trunk, behind the cover.

Fuse Box Diagrams

2016, 2017, 2018

Passenger compartment
Instrument panel fuse box diagram: Cadillac CT6
Instrument panel fuse box diagram: Cadillac CT6

Assignment of the fuses and relays in the instrument panel (2016-2018)

Description
F1Power outlet
F2Visor
F3Front blower
F4Body control module 8
F5Power steering column
F6Column lock
F7Glove box door
F8Front heated seat module
F9Sensing and diagnostic module
F10Body control module 4
F11Body control module 3
F12Data link connector
F13Not Used
F14Not Used
F15Rear vision camera
F16Display
F17Heating, ventilation, and air conditioning control
F18OnStar
F19Not Used
F202016-2017: Lane departure warning
2018: Not Used
F212016-2017: Not Used
2018: Traction power inverter 2
F22Infotainment 2
F23Central gateway module
F24Infotainment 1
F25Video processing module
F26Steering wheel controls
F27USB charge port
F28Wireless charger
F29Not Used
F30Speaker
Engine Compartment
Under-hood fuse box diagram: Cadillac CT6
Under-hood fuse box diagram: Cadillac CT6

Assignment of the fuses and relays in the engine compartment (2016-2018)

Description
12016-2017: Traction power inverter 2
2018: Not Used
2Power coolant pump
3Not Used
4Traction power inverter 1
5Transmission/Ignition
6Not Used
72016-2017: Starter 2
2018: Starter motor
82016-2017: Starter 1
2018: Starter pinion
9Horn
10Not Used
112016-2017: Right LED
2018: Not Used
122016-2017: Left LED
2018: Not Used
13Left and right high-beam headlamps
14Air conditioning control relay
152016-2017: Starter 2 relay
2018: Starter motor relay
162016-2017: Starter 1 relay
2018: Starter pinion relay
17Run/Crank relay
18Right cornering LED
192016-2017: Headlamp low-beam relay
2018: Not Used
20High-beam headlamp relay
21Air conditioning clutch
22Not Used
23Coolant heater control module
24Coolant pump
25Coolant pump relay
26HI fuel
27Steering column lock
28Rear heated seats
29Front heated seats
30Not Used
312016-2017: LED LGT BAT
2018: HDLP/DRL/ Right headlamp
32Air conditioning control module
332016-2017: AIR solenoid
2018: Not Used
34Not Used
352016-2017: Engine control module
2018: Engine control module IGN2
362016-2017: Engine control module 2
2018: Engine control module IGN1
37Coolant pump
Ignition coils–odd
38Ignition coils–even
Non walk 2
39Non walk
40Instrument cluster
41Not Used
42Fuel pump power module
43Instrument panel body/Ignition
44Aeroshutter
45Washer
46Front sensor
47Left cornering LED
482016-2017: AIR solenoid relay
2018: Not Used
492016-2017: Air pump relay
2018: Not Used
50Engine control module relay
51Wiper speed relay
52Wiper control relay
53Headlamp control relay
54Not Used
55Not Used
562016-2017: Air pump
2018: Not Used
57Not Used
582016-2017: Instrument panel electronic center
2018: Not Used
59Not Used
60ABS pump
61Front wiper
62Headlamp leveling
63Electric brake booster module
64Not Used
65Not Used
66Transfer case control module
67Electric brake booster
68Rear seat entertainment display
692016: Not Used
2017-2018: Rechargeable energy storage system coolant pump
70Not Used
71ABS valve
72Not Used
73Not Used
Luggage Compartment – Without Super Cruise (2016-2018)
Trunk fuse box diagram: Cadillac CT6
Trunk fuse box diagram: Cadillac CT6

Assignment of the fuses and relays in the Luggage compartment (Version 1 (2016-2018))

Description
F01UCAP
F02Trunk power outlet
F03Driver window motor
F04Not Used
F05Canister vent
F06Right rear memory seat
F07Body control module 7
F08Driver seat adjustment switch
F09Passive entry
Passive start
F10Rear subwoofer amplifier
F11Driver memory seat module
F12Not Used
F13Not Used
F14Rear seat memory/ heated
F15Left front amplifier
F16Right front seat
F17Rear heated seat
F18Regulated voltage
control battery
F192016-2017: Door mirror switch
2018: Driver, passenger door window/mirror/ driver seat adjustment
F20Not Used
F21Vehicle integration control module
F22Not Used
F23Rear closure
F24Not Used
F25Left motorized safety belt pretensioner
F26Rear defogger
F27Right front amplifier
F28Amplifier
F29Sunroof
F30Body control module 2
F31Body control module 6
F32Exterior heated mirror
F332016-2017: Right window
2018: Right mirror
F34Power trunk module
F35On-board charging module
F36Alarm siren module
F37DC AC inverter
F38Rear blower
F39Fuel pump power
F40Not Used
F41Rear seat power outlet
F42Left rear memory seat
F43Not Used
F44Rear closure release switch/lift gate module
F45Auxiliary audio/Video/Radio
F46External object calculating
Side blind zone alert
Radar short range sensor
Long range radar sensors (2018)
F47Not Used
F48Right front seat
F49Memory bolster module
F50Body control module 1
F51Transmission control module
F52Parking assist
F53Heated, cooled or ventilated seats (if equipped)
F542016:
Rain sensor
Power sounder
Intrusion
Universal remote system
2017-2018: Headliner
F55Front memory seat module
F56Evaporative emissions leak check module
F57Voltage current temperature module
F58Not Used
F59Engine control module power
F60Right motorized safety belt pretensioner
F61Parking lamps
F62Not Used
F63Not Used
F64Engine control module Ignition
F65Rear glass sunshade
F66Rear vision camera/Interior rearview mirror
F672016:
DC DC converter
Air quality sensor
2017: Run/Crank/MISC
2018: Run/crank misc/DC DC converter/air quality sensor
F68Damping control module
F692016: Not Used
2017-2018: Television tuner module
F70Not Used
F71Not Used
F72Not Used
F73Not Used
F74Not Used
F75Not Used
Relays
R1Rear seat power outlet relay
R2Fuel pump relay
R3Run/Crank relay
Luggage Compartment – With Super Cruise (2018)
Trunk fuse box diagram (With Super Cruise): Cadillac CT6
Trunk fuse box diagram (With Super Cruise): Cadillac CT6

Assignment of the fuses and relays in the Luggage compartment (Version 2, 2018)

Usage
F01Not Used
F02Body control module 2 and 4
F03Left rear external object calculating module
F04Steering wheel display touch sensor
F05Not Used
F06Not Used
F07Left front and right rear short range radar sensor/Camera image processing module
F08Driver memory seat module
F09Column friction device
F10Left headlamp
F11Not Used
F12Not Used
F13Left front subwoofer
F14Rear blower
F15Left window
F16Canister vent
F17Rear heated seat
F18Rear subwoofer
F19Damping control module
F22Not Used
F23Left front motorized seat belt pretensioner
F24Body control module 7
F25Passive entry/Passive start
F26Rear closure latch
F27Amplifier
F28Rear defogger
F29Ultrasonic park assist module
F30Body control module 1
F31Driver monitoring system
F32Driver mirror switch
F33Seat adjustment switch
F34Left front memory seat
F35Right rear memory seat
F36Heated mirror
F37Not Used
F38Transmission control module
F39Not Used
F40Not Used
F41Not Used
F42Not Used
F43Power trunk module
F44Right front memory seat
F45Not Used
F46Right window
F47Engine control module battery
F48Right front subwoofer
F49Body control module 6
F50Regulated voltage control battery
F51DC AC inverter
F52Fuel pump power module
F53Rear seat auxiliary power outlet
F54Left rear memory seat
F55Not Used
F56Rear closure release switch/Liftgate module
F57Rear left and rear center short range and long range radar sensor/Rt rear EOCM
F58Radio
F59Not Used
F60Memory bolster module
F61Not Used
F62Ventilated seat
F63Headliner
F64Passenger memory seat module
F65Right front short range radar sensor/ Advance driver assist map
F66Television tuner module
F67Not Used
F68Not Used
F69Not Used
F70Right front motorized seat belt pretensioner
F71Rear heated seat module
F72Sunroof
F73Rear vision camera/ Inside rear view mirror/Air quality sensor
F74Rear window sunshade
F75Engine control module ignition
F76Misc run crank/ Energy storage control module/ Camera
F77Trunk auxiliary power outlet
F78Rear HVAC display
F79Not Used
F80Not Used
F81Not Used
F82Not Used
F83Not Used
F84Not Used
F85Not Used
F86Not Used
F87Not Used
Relays
R1Rear seat auxiliary power outlet
R2Fuel pump
R3Run/Crank

2019

Instrument Panel
Instrument panel fuse box diagram: Cadillac CT6 (2019)
Instrument panel fuse box diagram: Cadillac CT6 (2019)

Assignment of the fuses in the passenger compartment (2019)

Description
F1Auxiliary power outlet front console
F2Visor
F3Front blower
F4Body control module 8
F5Power steering column
F6Electric steering column lock
F7Glove box door
F8Front heated seat module
F9Sensing and diagnostic module
F10Body control module 4
F11Body control module 3
F12Data link connector
F13
F14Electronic shifter
F15Front camera
F16Display
F17Heating, ventilation, and air conditioning control
F18OnStar
F19
F20
F21Traction power inverter 2
F22
F23Central gateway module
F24Center stack module/ Infotainment
F25Video processing module night vision
F26Steering wheel controls
F27USB charge port
F28Wireless charger
F29
F30Speaker
Engine compartment (2.0L, 3.0L and 3.6L Engines)
Under-hood fuse box diagram (2.0L, 3.0L and 3.6L): Cadillac CT6 (2019)
Under-hood fuse box diagram (2.0L, 3.0L and 3.6L): Cadillac CT6 (2019)

Assignment of the fuses and relays in the engine compartment – 2.0L, 3.0L and 3.6L (2019)

Description
1
2
3
4
5Transfer case control/Transmission control module ignition
6
7Starter motor
8Starter pinion
9Horn
10
11
12
13High-beam headlamps left/right
18Right cornering LED
21Air conditioning clutch
22Transmission auxiliary oil pump cooling
23
24Cabin heater pump
26Engine control module ignition
27Steering column lock ignition
28Rear heated seats ignition
29Front heated seats ignition
30
31Headlamp/Daytime running lamps/Right headlamp
32
33
34
35Engine control module ignition – 2
36Engine control module ignition – 1
37Coolant pump/ Ignition coils-odd
38Ignition coils – even/ Non walk 2
39Non walk
40Electric brake control module 1 /Instrument cluster/central gateway module ignition
41
42Fuel tank zone module/Ignition
43Heated steering wheel module/ Reflective light aux display/HVAC IGN/ Automatic occupant sensing display
44Aeroshutter
45Washer
46Front short range radar sensors
47Left cornering LED
54
55
56
57
58
59
60Antilock brake system pump/Electric brake control module – 1
61Front wiper
62Headlamp leveling
63
64
66Transfer case control module
67
68
69
70
71Antilock brake system valve
72
73
Relays
14Air conditioning control
15Starter motor
16Starter pinion
17Run/Crank
19
20High-beam headlamp
25Cabin heater pump
48
49
50Engine control module
51Wiper speed
52Wiper control
53Headlamp control
65
Engine compartment (4.2L Engine, Driver Side)
Under-hood fuse box diagram (4.2L, Driver Side): Cadillac CT6 (2019)
Under-hood fuse box diagram (4.2L, Driver Side): Cadillac CT6 (2019)

Assignment of the fuses and relays in the engine compartment – 4.2L, Driver Side (2019)

Description
F1
F2
F3
F4
F5High-beam headlamps left/right
F6
F7Front wiper
F8
F9Instrument cluster/ Electric brake control module 1/Central gateway module ignition
F10
F11Transmission control/Transfer case control module ignition
F12
F13Front heated seats ignition
F14Exhaust valve solenoid
F15Rear heated seats ignition
F16Fuel tank zone module ignition
F17
F18
F19
F20
F21Heated steering wheel module/ Reflective light aux display/HVAC IGN/ Automatic occupant sensing display
F22Electric steering column lock ignition
F23Washer
F24Left cornering LED
F25
F26
F27
F28
F29Electric brake control module – 1
Relays
R1
R2
R3
R4High-beam headlamp
R5Wiper control
R6Wiper speed
R7Run/Crank
R8
Engine compartment (4.2L Engine, Passenger Side)
Under-hood fuse box diagram (4.2L, Passenger Side): Cadillac CT6 (2019)
Under-hood fuse box diagram (4.2L, Passenger Side): Cadillac CT6 (2019)

Assignment of the fuses and relays in the engine compartment – 4.2L, Passenger Side (2019)

Description
F1Electric brake control module – 2
F2
F3Headlamp/Daytime running lamps
F4Right cornering LED
F5
F6Front short range radar sensors
F7Horn
F8Air conditioning clutch
F9
F10
F11Automatic headlamp leveling
F12Starter motor
F13Starter pinion
F14
F15
F16
F17Cabin heater pump
F18Transmission auxiliary oil pump cooling
F19Engine control module ignition
F20Non walk
F21Ignition coils-even/ Non walk – 2
F22Engine control module ignition – 1
F23Transfer case control module
F24
F25Ignition coils – odd
F26Charge air coolant pump
F27Engine control module ignition – 2
F28
F29
Relays
R1Headlamp/Daytime running lamps
R2Air conditioning control
R3Starter motor
R4Starter pinion
R5Cabin heater pump
R6Engine control module
R7
R8
Luggage compartment (Without Super Cruise)
Trunk fuse box diagram: Cadillac CT6 (2019)
Trunk fuse box diagram: Cadillac CT6 (2019)

Assignment of the fuses and relays in the luggage compartment – Without Super Cruise (2019)

Description
F01
F02Auxiliary trunk power outlet
F03Left window
F04
F05Canister vent
F06Right rear memory seat
F07Body control module 7
F08Passenger/Rear seat adjustment switch
F09Passive entry/Passive start battery
F10Rear subwoofer
F11Left front memory seat module
F12
F13
F14Rear seat memory/ Heated
F15Left front subwoofer
F16Right front memory seat
F17Rear heated seat
F18Regulated voltage control battery
F19Driver passenger door window/Mirror/ Driver seat adjustment/Fuel door switch
F20Electric brake control module – 2
F21Vehicle integration control module
F22
F23Rear closure latch
F24
F25Left front motorized seat belt pretensioner
F26Rear defogger
F27Right front subwoofer
F28Amplifier
F29Sunroof
F30Body control module 2
F31Body control module 6
F32Exterior heated mirrors
F33Right window
F34Power trunk module
F35On-board charging module
F36Pedestrian friendly alert function
F37
F38Rear blower
F39Fuel pump power module/Fuel tank zone module
F40
F41Rear seat auxiliary power outlet
F42Left rear memory seat
F43
F44Rear closure release switch/Power trunk module/Integrated chassis control module battery
F45Auxiliary audio/Video
F46External object calculating module/ Side blind zone alert/ Rear center short range radar sensor/ Long range radar sensors
F47
F48
F49Memory bolster module
F50Body control module 1
F51Transmission control module
F52Park assist
F53Ventilated seats
F54Universal garage door opener/Power sounder module/Rain sensor
F55Front memory seat module
F56Evaporative emissions leak check module/Rear HVAC display
F57Voltage current temperature module
F58
F59Engine control module battery
F60Right front motorized seat belt pretensioner
F61
F62
F63Rear seat infotainment module
F64Engine control module ignition
F65Rear window sunshade
F66Rear vision camera/ Rearview mirror
F67Run/Crank misc/Air quality sensor/ Integrated chassis control module/ Electronic shifter/DC DC converter
F68Damping control module
F69Television tuner module
F70
F71
F72
F73
F74
F75
Relay
R1Rear seat auxiliary power outlet
R2Spare
R3Run/Crank
Luggage compartment (With Super Cruise)
Trunk fuse box diagram (With Super Cruise): Cadillac CT6 (2019)
Trunk fuse box diagram (With Super Cruise): Cadillac CT6 (2019)

Assignment of the fuses and relays in the luggage compartment – With Super Cruise (2019)

Description
F01
F02Body control module 2 and 4
F03Left rear external object calculating module
F04Steering wheel display/Touch sensor
F05
F06
F07Left front and right rear short range radar sensor/Camera image processing module
F08Driver memory seat module
F09Column friction device
F10Left headlamp
F11
F12
F13Left front subwoofer
F14Rear blower
F15Left window
F16Canister vent
F17Rear seat memory/ Heated
F18Rear subwoofer
F19Damping control module
F20
F21Electric brake control module – 2
F22
F23Left front motorized seat belt pretensioner
F24Body control module 7
F25Passive entry/Passive start battery
F26Rear closure latch
F27Amplifier
F28Rear defogger
F29Park assist module
F30Body control module 1
F31Driver monitoring system
F32Driver passenger door window/Mirror/ Driver seat adjustment/Fuel door switch
F33Passenger/Rear seat adjustment switch
F34Left front memory seat
F35Right rear memory seat
F36External heated mirror
F37
F38Transmission control module
F39Rear seat infotainment module
F40
F41
F42
F43Power trunk module
F44Right front memory seat
F45
F46Right window
F47Engine control module battery
F48Right front subwoofer
F49Body control module 6
F50
F51
F52Fuel pump power module/Fuel tank zone module
F53Rear seat auxiliary power outlet
F54Left rear memory seat
F55
F56Rear closure release switch/Power trunk module
F57Rear left and rear center short range radar sensors/Long range radar sensors/ Right rear external object calculating module
F58Auxiliary audio/Video
F59
F60Memory bolster module
F61
F62Ventilated seat
F63Universal garage door opener/Power sounder module/Rain sensor
F64Passenger memory seat module
F65Right front short range radar sensor/ Advance driver assist map
F66Television tuner module
F67
F68
F69
F70Right front motorized seat belt pretensioner
F71Rear heated seat module
F72Sunroof
F73Rear vision camera/ Rearview mirror/Air quality sensor
F74Rear window sunshade
F75Engine control module ignition
F76Misc run crank/ Energy storage control module/DC DC converter/Rear external object calculating module
F77Trunk auxiliary power outlet
F78Rear HVAC display
F79
F80
F81
F82
F83
F84
F85
F86
F87
Relays
R01Rear seat auxiliary power outlet
R02Spare
R03Run/Crank

Conclusion

For owners and enthusiasts of classic Cadillac CT6 2016-2019, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Cadillac’s craftsmanship and innovation in the automotive industry during that era.

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