X50A Fuse Block - Underhood Top View (without KL9)
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
X50A FUSE BLOCK - UNDERHOOD FUSE AND RELAY IDENTIFICATION LEGEND (WITHOUT KL9)
| No. | Device Label Name | Device Assigned Name | Rating | Description |
|---|---|---|---|---|
| Fuses | ||||
| 1 | EMPTY | F1UA | - | - |
| 2 | EMPTY | F2UA | - | - |
| 3 | MSB PASS | F3UA | 30A | M101R Seat Belt Retractor Motor Module - Right (AX7) |
| 4 | EMPTY | F4UA | - | - |
| 5 | EMPTY | F5UA | - | - |
| 6 | DRVR PWR SEAT | F6UA | 30A | K40D Seat Memory Control Module - Driver (Coupe, A45 or W2E), S64D Seat Adjuster Switch - Driver (Sedan with AQ9 except A45) |
| 11 | EMPTY | F11UA | - | - |
| 13 | PASS PWR SEAT | F13UA | 30A | K40P Seat Memory Control Module - Passenger (W2E), S64P Seat Adjuster Switch - Passenger (AQ9) |
| 14 | EMPTY | F14UA | - | - |
| 15 | PEPS (ATS/WPR FRT (CTS) | F15UA | 30A | - |
| 16 | EMPTY | F16UA | - | - |
| 17 | HDLP WASH | F17UA | 25A | G16 Headlamp Washer Pump (CE4) |
| 18 | EMPTY | F18UA | - | - |
| 19 | ABS PUMP | F19UA | 60A | K17 Electronic Brake Control Module |
| 20 | ABS VLV | F20UA | 30A | K17 Electronic Brake Control Module |
| 21 | EMPTY | F21UA | - | - |
| 22 | MSB DRVR | F22UA | 30A | M101L Seat Belt Retractor Motor Module - Left (AX7) |
| 27 | SPARE/HTD SEAT2 | F27UA | 15A | K29F Seat Heating Control Module - Front (KA1), K40P Seat Memory Control Module - Passenger (W2E), K134P Seat Bolster Memory Control Module - Passenger (W2E), S64P Seat Adjuster Switch - Passenger (W2E), S115P Easy Entry Switch - Passenger Seat (Coupe with W2E) |
| 28 | SPARE/REV LK OUT | F28UA | 10A | M47 Reverse Inhibit Solenoid Actuator (MG9) |
| *29 | AFS AHL/PED PROT | F29UA | 10A | K26 Headlamp Control Module (T4F), K42 Pedestrian Impact Detection Control Module (B3T) |
| 30 | EMPTY | F30UA | - | - |
| 31 | PASS WNDW SW | F31UA | 10A | S79P Window Switch - Passenger (A45) |
| 32 | EMPTY | F32UA | - | - |
| 33 | S/ROOF | F33UA | 30A | M69 Sunroof Motor (CF5) |
| 34 | WPR FRT | F34UA | 30A | KR12B Windshield Wiper Relay, KR12C Windshield Wiper Speed Control Relay |
| 35 | STR COL LK | F35UA | 5A | K60 Steering Column Lock Module (ULS) |
| 36 | RBBEC IGN | F36UA | 20A | F25RA, F28RA, K29F Seat Heating Control Module - Front (KA1) |
| 37 | SPARE/MIL IGN | F37UA | 5A | P16 Instrument Cluster |
| 38 | SPARE PT FUSE | F38UA | 10A | - |
| 39 | O2 SNSR EMIS | F39UA | 10A | B52B Heated Oxygen Sensor 2 (LCV or LTG), B52D Heated Oxygen Sensor - Bank 1 Sensor 2 (LF4), B52F Heated Oxygen Sensor - Bank 2 Sensor 2 (LF4), B75B Mass Air Flow/Intake Air Temperature Sensor (LF4), B75C Multifunction Intake Air Sensor |
| 40 | IGN COIL INJ | F40UA | 15A | B52A Heated Oxygen Sensor 1 (LCV or LTG), B52C Heated Oxygen Sensor - Bank 1 Sensor 1 (LF4), B52E Heated Oxygen Sensor - Bank 2 Sensor 1 (LF4), E41 Engine Coolant Thermostat Heater (LCV), K20 Engine Control Module, Q12 Evaporative Emission Purge Solenoid Valve, Q40 Turbocharger Bypass Solenoid Valve (LTG), Q40A Turbocharger 1 Bypass Solenoid Valve (LF4), Q40B Turbocharger 2 Bypass Solenoid Valve (LF4), Q42 Turbocharger Wastegate Solenoid Valve (LTG), Q42A Turbocharger 1 Wastegate Solenoid Valve (LF4), Q42B Turbocharger 2 Wastegate Solenoid Valve (LF4), Q44 Engine Oil Pressure Control Solenoid Valve (LCV or LTG), R33 Turbocharger Wastegate Diode (LF4), T8B Ignition Coil 2 (LF4), T8D Ignition Coil 4 (LF4), T8F Ignition Coil 6 (LF4) |
| 41 | SPARE/IGN COIL INJ | F41UA | 15A | K20 Engine Control Module, T8A Ignition Coil 1, T8B Ignition Coil 2 (LCV or LTG), T8C Ignition Coil 3, T8D Ignition Coil 4 (LCV or LTG), T8E Ignition Coil 5 (LF4) |
| 42 | ECM | F42UA | 25A | K20 Engine Control Module |
| 43 | EMPTY | F43UA | - | - |
| 45 | WASH | F45UA | 20A | KR11 Windshield Washer Pump Relay |
| 46 | EMPTY | F46UA | - | - |
| 47 | FRT WASH RLY | F47UA | - | - |
| 48 | IP BODY IGN | F48UA | 10A | A10 Inside Rearview Mirror (DD8), K33 HVAC Control Module, P14 Passenger Air Bag Disabled Indicator (T2J), P43 Collision Alert Indicators (UEU without UV6), S42 Headlamp Leveling Switch (TR6) |
| 49 | FSCM IGN | F49UA | 10A | K38 Chassis Control Module (LCV or LTG), K111 Fuel Pump Driver Control Module (LF4) |
| 50 | HTD STR WHL | F50UA | 15A | F25DA (UVD), Q80 Engine Mount Solenoid Valve (LF4), Q80L Engine Mount Solenoid Valve - Left (LCV or LTG), Q80R Engine Mount Solenoid Valve - Right (LCV or LTG) |
| 51 | ECM IGN | F51UA | 15A | K20 Engine Control Module |
| 52 | TCM IGN | F52UA | 15A | K71 Transmission Control Module (M5T or M5U) |
| 53 | COOL PUMP | F53UA | 10A | M10 Charge Air Cooler Coolant Pump (LF4) |
| 55 | EMPTY | F55UA | - | - |
| 56 | TCM/SPARE | F56UA | 15A | K71 Transmission Control Module (M5T or M5U) |
| 64 | AHL | F64UA | 10A | M3L Headlamp Horizontal Motor - Left (T4F), M3R Headlamp Horizontal Motor - Right (T4F), M29L Headlamp Leveling Actuator - Left (TR7), M29R Headlamp Leveling Actuator - Right (TR7) |
| 65 | LT HID | F65UA | 15A | T7L Headlamp Ballast - Left (T4F) |
| 66 | RT HID | F66UA | 15A | T7R Headlamp Ballast - Right (T4F) |
| 67 | HDLP HI LT/RT | F67UA | 10A | M28L High Beam Solenoid Actuator - Left, M28R High Beam Solenoid Actuator - Right |
| 68 | AERO SHUTTER | F68UA | 10A | M29L Headlamp Leveling Actuator - Left (TR6), M29R Headlamp Leveling Actuator - Right (TR6), M96 Active Grille Air Shutter Actuator (XFE) |
| 69 | HORN | F69UA | 15A | P13 Horn Assembly |
| 71 | COOL FAN | F71UA | 60A | K22 Cooling Fan Control Module (LCV) or (LTG without V03) |
| 72 | STRTR2 | F72UA | 30A | - |
| 73 | BRK VAC PUMP | F73UA | 20A | M9 Brake Booster Pump Motor (J6G) |
| 74 | STRTR | F74UA | 30A | KR27 Starter Relay |
| 75 | A/C CLTCH | F75UA | 10A | KR14 Brake Booster Pump Motor Relay (J6G), KR29 A/C Compressor Clutch Relay |
| 76 | EMPTY | F76UA | - | - |
| Relays | ||||
| 8 | HDLP WASH RLY | KR2 Headlamp Washer Pump Relay | - | F17UA |
| 9 | EMPTY | - | - | - |
| 12 | EMPTY | - | - | - |
| 23 | WPR CNTRL RLY | KR12B Windshield Wiper Relay | - | KR12C Windshield Wiper Speed Control Relay |
| 24 | WPR SPD RLY | KR12C Windshield Wiper Speed Control Relay | - | M75 Windshield Wiper Motor |
| 25 | ECM RLY | KR75 Engine Controls Ignition Relay | - | F38UA, F39UA, F40UA, F41UA, F42UA, KR18 Charge Air Cooler Coolant Pump Relay (LF4), KR29 A/C Compressor Clutch Relay |
| 26 | EMPTY | - | - | - |
| 44 | EMPTY | - | - | - |
| 54 | COOL PUMP RLY | KR18 Charge Air Cooler Coolant Pump Relay | - | F53UA (LF4) |
| 57 | HDLP LO RLY | KR49 Headlamp Low Beam Relay | - | F65UA, F66UA |
| 58 | HDLP HI RLY | KR48 Headlamp High Beam Relay | - | F67UA |
| 59 | RUN/CRNK RLY | KR73 Ignition Main Relay | - | F35UA, F36UA, F37UA, F48UA, F49UA, F50UA, F51UA, F52UA, F68UA |
| 60 | STRTR2 RLY | - | - | - |
| 61 | VAC PUMP RLY | KR14 Brake Booster Pump Motor Relay | - | F73UA |
| 62 | STRTR RLY | KR27 Starter Relay | - | F74UA |
| 63 | A/C CNTRL RLY | KR29 A/C Compressor Clutch Relay | - | Q2 A/C Compressor Clutch |
|
NOTE:
Relays listed below are non-serviceable Printed Circuit Board (PCB) relays and are internal to the block. |
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| 7 | EMPTY | - | - | - |
| 10 | EMPTY | - | - | - |
| 46 | EMPTY | - | - | - |
| 47 | FRT WASH RLY | KR11 Windshield Washer Pump Relay | - | G24 Windshield Washer Pump |
| 70 | HORN RLY | KR3 Horn Relay | - | F69UA |
|
NOTE:
Items listed below are diagnostic test points for PCB relays |
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| CP1 | - | TP1 | - | Not Used |
|
NOTE:
Items listed below are diagnostic test points for Wiper/Washer System |
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| CP2 | - | TP2 | - | KR11 Windshield Washer Pump Relay |
|
NOTE:
Items listed below are diagnostic test points for Ground Distribution |
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| CP3 | - | TP3 | - | Ground Bus |