Cadillac CT6 | 2019-2020

Access Cadillac CT6 fuse box diagrams for 2019–2020 facelifted models with relay locations, fuse assignments, panel layouts, and electrical system information. This article covers the facelifted first-generation Cadillac CT6, available from 2019, and includes fuse box diagrams for Cadillac CT6 2019 and 2020, along with details about the location of the fuse panels inside the vehicle and a clear explanation of the assignment of each fuse and relay (fuse layout).

Engine Compartment

2.0L, 3.0L, 3.6L Engines

Fuse Box Location

This fuse block is located on the driver’s side of the engine compartment.

Fuse Box Diagram

Fuses

Assignment of the fuses in the engine compartment fuse box (for 2.0L, 3.0L and 3.6L engines)

Fuse Data
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No.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

Assignment of the relays in the engine compartment fuse box (for 2.0L, 3.0L and 3.6L engines)

Fuse Data
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No.Description
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–

4.2L Engines

Fuse Box Location

The 4.2L engine has two underhood fuse blocks, one on each side of the engine compartment.

Fuse Box Diagram (Driver Side)

Fuses

Assignment of the fuses in the engine compartment driver’s side (for 4.2L engines)

Fuse Data
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No.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

Assignment of the relays in the engine compartment driver’s side (for 4.2L engines)

Fuse Data
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No.Description
R1–
R2–
R3–
R4High-beam headlamp
R5Wiper control
R6Wiper speed
R7Run / Crank
R8–

Fuse Box Diagram (Passenger Side)

Fuses

Assignment of the fuses in the engine compartment passenger’s side (for 4.2L engines)

Fuse Data
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No.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

Assignment of the relays in the engine compartment passenger’s side (for 4.2L engines)

Fuse Data
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No.Description
R1Headlamp / Daytime running lamps
R2Air conditioning control
R3Starter motor
R4Starter pinion
R5Cabin heater pump
R6Engine control module
R7–
R8–

Passenger Compartment

Fuse Box Location

The instrument panel fuse block is located behind the driver-side instrument panel storage compartment.

To access the fuses, press and release the center of the compartment door near the top to open it. Then squeeze the retaining tabs on both sides of the compartment until they clear the instrument panel. Allow the compartment to swing downward to expose the fuse box.

Fuse Box Diagram

Fuses

Assignment of the fuses in the passenger compartment fuse box

Fuse Data
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No.Description
F1Auxiliary power outlet front console
F2Visor
F3Front blower
F4Body control module 8
F52019: Power steering column
2020: Steering column switch module
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–
F212019: Traction power inverter 2
2020: –
F22–
F23Central gateway module
F24Center stack module / Infotainment
F25Video processing module night vision
F26Steering wheel controls
F27USB charge port
F28Wireless charger
F29–
F30Speaker

Luggage Compartment

Fuse Box Location

The rear compartment fuse block is located behind a cover on the passenger side.

Fuse Box Diagram (Without Super Cruise)

Fuses

Assignment of the fuses in the luggage compartment (Without Super Cruise)

Fuse Data
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No.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
F182019: Regulated voltage control battery
2020: –
F19Driver passenger door window / Mirror / Driver seat adjustment / Fuel door switch
F20Electric brake control module – 2
F212019: Vehicle integration control module
2020: –
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
F352019: On-board charging module
2020: –
F362019: Pedestrian friendly alert function
2020: –
F37–
F38Rear blower
F392019: Fuel pump power module / Fuel tank zone module
2020: 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
F542019: Universal garage door opener / Power sounder module / Rain sensor
2020: Headliner / Universal garage door opener / Power sounder module / Rain sensor
F55Front memory seat module
F562019: Evaporative emissions leak check module / Rear HVAC display
2020: Rear HVAC Display
F572019: Voltage current temperature module
2020: –
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 / Inside 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–

Relays

Assignment of the relays in the luggage compartment (Without Super Cruise)

Fuse Data
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No.Description
R1Rear seat auxiliary power outlet
R2Spare
R3Run / Crank

Fuse Box Diagram (With Super Cruise)

Fuses

Assignment of the fuses in the luggage compartment (With Super Cruise)

Fuse Data
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No.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–
F522019: Fuel pump power module / Fuel tank zone module
2020: 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 / Inside Rearview mirror / Air quality sensor
F74Rear window sunshade
F75Engine control module ignition
F762019: Misc run crank / Energy storage control module / DC DC converter / Rear external object calculating module
2020: Misc run crank / Energy storage control module / DC DC converter / Rear external object calculating module / Shifter interface board module
F77Trunk auxiliary power outlet
F78Rear HVAC display
F79–
F80–
F81–
F82–
F83–
F84–
F85–
F86–
F87–

Relays

Assignment of the relays in the luggage compartment (With Super Cruise)

Fuse Data
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No.Description
R01Rear seat auxiliary power outlet
R02Spare
R03Run / Crank

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