2009 Cadillac STS Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

8 Alternator / Generator parts for the 2009 Cadillac STS come from 7 brands — TERREPOWER, GM GENUINE, WAI GLOBAL and 4 other brands. The "Popular" part is GM GENUINE 84009371.

The New section lists 2 options from GM GENUINE and WAI GLOBAL — brand-new units rather than rebuilt ones. GM GENUINE 84009371 is listed in this group.

The Remanufactured section lists 6 options from TERREPOWER, DENSO, ACDELCO and 2 other brands — factory-rebuilt units with new wear components. DENSO 2101064 is listed in this group.

Listed part numbers: GM GENUINE 84009371, WAI GLOBAL 11248N and DENSO 2101064, plus the other parts above.

This table covers the sirens in the anti-theft system. Read more

One part is listed for the 2009 Cadillac STS — GM GENUINE 15213135.

This table covers the Automatic Headlamp sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Automatic Headlamp Sensor parts are listed for the 2009 Cadillac STS, from GM GENUINE and STANDARD MOTOR PRODUCTS.

Listed part numbers: GM GENUINE 13498958 and STANDARD MOTOR PRODUCTS EFL172.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

6 Battery parts are listed for the 2009 Cadillac STS, from DEKA, LUCAS, ACDELCO and 3 other brands. DEKA 9A48 carries the "Popular" badge.

This group includes DEKA 9A48, LUCAS LBAGM004A and ACDELCO 48AGM and the remaining parts above.

This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

This group shows a single part: GM GENUINE 13505369.

This table covers the brackets that mount the Battery Tray. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

One part is listed for the 2009 Cadillac STS — DORMAN 700251.

This table covers the resettable circuit breakers in this vehicle's electrical system. Read more

BUSSMANN supplies both parts for the 2009 Cadillac STS.

The 30 Amp section lists 1 option from BUSSMANN — grouped under the catalog's "30 Amp" designation — the notes column spells out what sets them apart. BUSSMANN CB21130 is listed in this group.

In the 40 Amp grade, BUSSMANN supplies 1 part: grouped under the catalog's "40 Amp" designation — the notes column spells out what sets them apart. A representative part number is BUSSMANN CB191140.

Listed part numbers: BUSSMANN CB21130 and BUSSMANN CB191140.

This table covers the engine-control modules that run fuel, spark and emissions. Read more

2 Engine Control Module (ECM Computer) parts for the 2009 Cadillac STS come from GM GENUINE.

Listed part numbers: GM GENUINE 19421504 and GM GENUINE 12678512.

This table covers the replacement fuses for this vehicle's fuse boxes. Typical signs include one circuit dead while its neighbor still works, or a fuse that blows again as soon as you replace it. Match amperage and fuse type. A repeat blow means a short — find it before the next fuse. Read more

22 Fuse parts are listed for the 2009 Cadillac STS, from BUSSMANN and LITTELFUSE. LITTELFUSE MIN15 carries the "Popular" badge.

The 10 Amp section lists 2 options from BUSSMANN and LITTELFUSE — grouped under the catalog's "10 Amp" designation — the notes column spells out what sets them apart. BUSSMANN ATM10LP is listed in this group.

In the 15 Amp grade, LITTELFUSE and BUSSMANN supply 2 parts: grouped under the catalog's "15 Amp" designation — the notes column spells out what sets them apart. A representative part number is LITTELFUSE MIN15.

In the 2 Amp grade, LITTELFUSE supplies 1 part: grouped under the catalog's "2 Amp" designation — the notes column spells out what sets them apart. A representative part number is LITTELFUSE MIN2.

In the 20 Amp grade, LITTELFUSE and BUSSMANN supply 2 parts: grouped under the catalog's "20 Amp" designation — the notes column spells out what sets them apart. A representative part number is LITTELFUSE MIN20.

The 25 Amp section lists 2 options from BUSSMANN and LITTELFUSE — grouped under the catalog's "25 Amp" designation — the notes column spells out what sets them apart. BUSSMANN ATM25LP is listed in this group.

The 30 Amp section: 5 options from BUSSMANN and LITTELFUSE. LITTELFUSE JCAS30 is listed in this group.

40 Amp: 3 parts, from BUSSMANN and LITTELFUSE. A representative part number is BUSSMANN FMX40.

The 50 Amp section lists 2 options from BUSSMANN and LITTELFUSE — grouped under the catalog's "50 Amp" designation — the notes column spells out what sets them apart. BUSSMANN FMX50 is listed in this group.

In the 60 Amp grade, LITTELFUSE supplies 1 part: grouped under the catalog's "60 Amp" designation — the notes column spells out what sets them apart. A representative part number is LITTELFUSE JCAS60.

In the 7.5 Amp grade, BUSSMANN and LITTELFUSE supply 2 parts: grouped under the catalog's "7.5 Amp" designation — the notes column spells out what sets them apart. A representative part number is BUSSMANN ATM712LP.

This table covers the HID Lighting ballasts. Read more

3 HID Lighting Ballast parts for the 2009 Cadillac STS come from 3 brands — AUTOTECNICA, DORMAN and WELLS.

Part numbers include AUTOTECNICA CA1320411, DORMAN 601172 and WELLS 6R1079.

This table covers the horns mounted in the front of the vehicle. Read more

FIAMM supplies the 13 Horn parts for the 2009 Cadillac STS. FIAMM 7210223 carries the "Popular" badge.

In the Accessory Replacement grade, FIAMM supplies 7 parts: grouped under the catalog's "Accessory Replacement" designation — the notes column spells out what sets them apart. A representative part number is FIAMM 7210223.

The Standard Replacement section lists 6 options from FIAMM — built to original-equipment specification. FIAMM 7201223 is listed in this group.

This table covers the horn contacts in the steering column. Read more

One part is listed for the 2009 Cadillac STS — GM GENUINE 25889495.

This table covers the key fobs that lock, unlock and start the vehicle. Read more

3 Keyless Entry Remote parts for the 2009 Cadillac STS come from 2 brands — GM GENUINE and DORMAN.

This group includes DORMAN 99110, GM GENUINE 25943677 and GM GENUINE 25943676.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Parking Aid Sensor parts for the 2009 Cadillac STS come from 2 brands — GM GENUINE and STANDARD MOTOR PRODUCTS.

This group includes GM GENUINE 88891836 and STANDARD MOTOR PRODUCTS PPS71.

This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor. Read more

6 Speed Sensor parts are listed for the 2009 Cadillac STS, from HOLSTEIN, DELPHI, GM GENUINE and 3 other brands. DELPHI SS12254 carries the "Popular" badge.

In the Economy grade, HOLSTEIN supplies 1 part: the catalog's value-priced group. A representative part number is HOLSTEIN 2VSS0527.

The Standard Replacement section: 5 options from DELPHI, GM GENUINE, NTK and 2 other brands. DELPHI SS12254 is listed in this group.

Part numbers include DELPHI SS12254, HOLSTEIN 2VSS0527 and GM GENUINE 24284706, among others listed above.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

13 Starter Motor parts for the 2009 Cadillac STS come from 10 brands — PURE ENERGY, ACDELCO, REMY and 7 other brands. The "Popular" part is PURE ENERGY 6471SN.

The New section: 5 options from PURE ENERGY, TYC, ACDELCO and 2 other brands. PURE ENERGY 6471SN is listed in this group.

The Remanufactured section: 8 options from GM GENUINE, ACDELCO, BOSCH and 5 other brands. GM GENUINE 3231633 is listed in this group.