Electrical System
Electrical System Overload
The vehicle has fuses and circuit breakers to protect against an electrical system overload.
When the current electrical load is too heavy, the circuit breaker opens and closes, protecting the circuit until the current load returns to normal or the problem is fixed. This greatly reduces the chance of circuit overload and fire caused by electrical problems. Fuses and circuit breakers protect the wires that provide the power to the devices in your vehicle. If there is a problem on the road and a fuse needs to be replaced, the same amperage fuse can be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible. To check a fuse, look at the band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a fuse of the identical size and rating.
Replacing a Blown Fuse
1. Turn off the vehicle.
2. Locate the fuse puller on the instrument panel end cap. See the Instrument Panel Fuse Block 0 348.
3. Use the fuse puller to remove the fuse from the top or side, as shown above.
4. If the fuse must be replaced immediately, spare fuses are also provided on the instrument panel end cap or borrow a replacement fuse with the same amperage from the fuse block. Choose a vehicle feature that is not needed to safely operate the vehicle. Repeat Steps 2-3.
5. Insert the replacement fuse into the empty slot of the blown fuse.
At the next opportunity, see your dealer to replace the blown fuse.
Headlamp Wiring
An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the headlamp wiring checked right away if the lamps go on and off or remain off.
Windshield Wipers
If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart. Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage
damage. Always clear ice and heavy snow from the windshield before using the windshield wipers. If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.
Danger
Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. Use of an oversized fuse or circuit breaker can result in a vehicle fire. You and others could be seriously injured or killed.
Warning
Installation or use of fuses that do not meet GM’s original fuse specifications is dangerous. The fuses could fail, and result in a fire. You or others could be injured or killed, and the vehicle could be damaged.
See Accessories and Modifications 0 318 and General Information 0 318. To check or replace a blown fuse, see Electrical System Overload 0 341.
Engine Compartment Fuse Block
The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.
Lift the cover to access the fuse block.
Caution
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.
Fuses Usage
1 – 2 – 3 –
4 – 6 ELM
7 – Exterior Lighting Module 7
7 ELM 4 – Exterior Lighting Module 4
8 –
9 ELM 5 – Exterior Lighting Module 5
10 ELM 6 – Exterior Lighting Module 6
11 Spare 12 – 13 Washer Front
14 Washer Rear
15 REC 2 – Rear Electrical Center 2
16 Power Sounder
17 Spare
19 DC/AC Inverter
20 IECR 2 21 – 22 IECL 2
24 EBCM – Electronic Brake Control Module
25 REC 1 – Rear Electrical Center 1
26 Camera Wash
27 Horn
28 Headlamp RT – Right
29 Headlamp LT – Left
30 ELM 3 – Exterior Lighting Module 3
31 ELM 1 – Exterior Lighting Module 1
32 – 33 Not R/C
34 – 37 On Board Diagnostics (OBD) Body
38 MISC Body
39 Upfitter
40 MISC Instrument Panel (IP)
41 Trailer Parking Lamps
42 Right Taillamp
44 Trailer Tow
45 Secondary Axle Motor
46 Engine Control Module (ECM) Ignition
47 OBD Engine 48 – 49 TCM – Telematics Control Module
50 A/C Clutch
51 TCCM – Transfer Case Control Module
52 Front Wiper
53 – 54 Left Taillamps
55 Trailer Back-up Lamp
56 SADS – Semi Active Damping System
57 Spare
58 Starter Motor
60 AFM 1 – Active Fuel Management 1
61 Automatic Lamp Control (ALC) Main
62 ICCM/CVS/DEF – Integrated Chassis Control Module/Canister Vent Solenoid/Diesel Exhaust Fluid
63 Trailer Brake
65 AUX UEC – Auxiliary Underhood Electrical Center
66 Left Cool Fan Motor
67 AFM 2 – Active Fuel Management 2
68 Automatic Lamp Control (ALC) Motor
69 Starter Pinion
71 Cool Fan Motor Lower
72 Right Cool Fan Motor/ Lower
73 Left Trailer Stop Turn Lamp
74 TIM 2 – Trailer Interface Module 2
75 DEFC – Diesel Exhaust Fluid Controller
76 ELEC RNG BDS
78 ECM – Engine Control Module
79 –
80 Cabin Cool Pump 17W
81 Right Trailer Stop Turn Lamp
82 TIM 1 – Trailer Interface Module 1
83 FTZM – Fuel Tank Zone Module
84 Trailer Battery
85 Engine
86 ECM – Engine Control Module
87 Injector B Even
88 02 B Sensor
89 02 A Sensor
90 Injector A Odd
91 Engine Control Module (ECM) Throttle Control
92 Cool Fan Clutch AERO Shutter
Relays Usage
5 –
18 DC/AC Inverter
23 –
35 Park Lamp
36 Run/Crank
43 Secondary Axle Motor
59 A/C Clutch
64 Starter Motor
70 Starter Pinion
77 Powertrain
Instrument Panel Fuse Block
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. Pull off the cover to access the fuse block. A fuse puller is available on the right instrument panel end cap.
There are relays on the back of the fuse block. To access, press the tabs and remove the fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Fuses Usage
F1 Right Door
F2 Left Door
F3 Universal Garage Door Opener (UGDO)/OnStar Hands-free Calling (OHC)/ Camera
F4 BCM 2 – Body Control Module 2
F5 Displays
F6 Front Blower
F8 Left Door Panel
F10 Tilt/Column Lock
F11 USB/Data Link Connector (DLC)
F12 Central Gateway Module (CGM)/Onstar
F14 Right Door Panel
F17 Steering Wheel Control
F18 AVM 1 – Active Vibration Module 1
F19 – F20 – F21 –
F22 Heated Wheel
F23 – F24 –
F25 Search Engine Optimization (SEO)/UPFITTER
F26 USB/Search Engine Optimization (SEO) Retained Accessory Power (RAP)
F27 Auxiliary Power Outlet (APO)/Retained Accessory Power
F28 Spare F30 SDM/AOS – Sensing and Diagnostic Module/ Automatic Occupant Sensing
F31 BCM 3 – Body Control Module 3
F32 Center Stack Module (CSM)/USB
F33 BCM 4 – Body Control Module 4
F34 Out of Park
F40 – F41 –
F42 Electric Park Brake Switch
F43 RSE – Road Side Equipment
F44 AVM 2 – Active Vibration Module 2
F45 Radio Module
F46 BCM 1A – Body Control Module 1A
F47 – F48 TCM – Telematics Control Module
F49 BCM 1 – Body Control Module 1
F50 DMS – Driver Monitoring System
F51 – F52 – F53 –
F54 Sunroof
F55 APO 3 – Auxiliary Power Outlet 3
F56 DC/DC CNV BATT 1 – Direct Current/Direct Current Converter Battery 1
F57 DC/DC CNV BATT 2 – Direct Current/Direct Current Converter Battery 2
F58 Spare F59 –
Circuit Breakers Usage
CBO1 APO 1 – Auxiliary Power Outlet 1
CBO2 APO 2 – Auxiliary Power Outlet 2
Relays Usage
K1 – K2 RAP/ACCY 1 – Retain
Accessory Power/ Accessory 1
K4 RAP/ACCY 2 – Retain Accessory Power/ Accessory 2
Relays Usage
K5 –
Rear Compartment Fuse Block
The rear compartment fuse block is behind the access panel on the left side of the compartment. Pull the panel out by grabbing the finger access slot at the rear edge.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Vehicle Care 351 Fuses Usage
F01 RFA – Remote Function
Actuator F02 WCM – Wireless Charging
Module F03 Heated Seat Module Row 1
(Battery 1) F04 Memory Seat Module
(MSM) Driver F05 – F06 – F07 Amp Aux 2 – Amplifier
Auxiliary 2 F08 – F09 SEO UPFTR 2 – Search
Engine Optimization Upfitter 2
F10 Motor Seatbelt Passenger F11 Power Folding Seat Row 2 F12 GBS F13 – F14 –
Fuses Usage
F15 Heated Seat Module Row 1
(Battery 2) F16 RH CINCH Latch – Right
Hand Cinch Latch F17 Memory Seat Module
Passenger F18 Rear Wiper F19 Motor Seatbelt Driver F20 Rear Defogger F21 – F22 Rear HVAC Display Control F23 EOCM – External Object
Calculation Module F24 Amp Aux 3 – Amplifier
Auxiliary 3 F25 OBS DET F26 RDCM – Rear Drive Control
Module F27 Amp Aux 1 – Amplifier
Auxiliary 1 F28 VPM – Video Processing
Module
Fuses Usage
F29 – F30 – F31 Amp – Amplifier F32 – F33 ICCM – Integrated Chassis
Control Module F34 Heated Seat Module Row 2 F35 HFCR F36 ELM – Exterior Lighting
Module F37 – F38 Power Slide Console F39 – F40 – F41 – F42 – F43 UPA – Universal Park Assist F44 –
352 Vehicle Care Fuses Usage
F45 AFL AHL – Adaptive
Forward Lighting/ Automatic Headlamp Leveling
F46 Rear HVAC Blower Motor F47 LH CINCH Latch – Left Hand
Cinch Latch F48 Power Seat Recline Module F49 Lift Glass F50 Driver Power Seat F51 Power Liftgate Module F52 Passenger Power Seat
Relays Usage
K53 – K54 – K55 L/GLASS
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