Your best bet would be to have the vehicle scanned for DTC'S - diagnostic trouble codes first . Do you know which of these your vehicle has ?
Keyless Entry System Inoperative (Active)
Keyless Entry System Inoperative (Passive)
Does the customer complain about other symptoms related to this, such as poor range when the key fob buttons are pressed or intermittent Tire Pressure Monitoring issues? (It's possible the RF External Antenna at the RCDLR may have a poor connection.)
YES - Go to Step 3
No - Go to Step 4
3
Inspect the external RF antenna connection at the RCDLR. First, gently pull on the coax connector at the module. If the coax comes out, then it wasn't seated properly. Remove and carefully inspect the coax connection for bent blades or a bent center pin. Fix coax connection if necessary and re-seat connector until a "click" is heard. Gently pull on the coax connection to make sure it is seated properly. Was the inspection made?
Press each button of the transmitter one at a time.
Does the system operate normally?
YES - Go to Testing for Intermittent Conditions and Poor Connections
NO - Go to Step 5
5
Lock and unlock the door locks using the controls inside the vehicle.
Do the locks operate properly?
YES - Go to Step 6
NO - Go to Symptoms - Doors
6
Operate the rear compartment release and the fuel door release from the controls inside the vehicle.
Do the rear compartment release and the fuel door release operate properly?
YES - Go to Step 7
NO - Go to Symptoms - Body Rear End
Important: Ensure that the keyless entry transmitter is the correct model for the vehicle remote system. A wrong model transmitter may pass this test, but will not activate the keyless entry system.
Turn on the J 43241 Keyless Entry Tester.
Place the transmitter on the J 43241 test pad.
Press each button of the transmitter one at a time.
Does a tone sound and the green light illuminate on the J 43241 after each button is pressed?
YES - Go to Step 12
NO - Go to Step 8
8
Do any of the buttons on the transmitter sound the tone and illuminate the green light when pressed?
11
Replace the keyless entry transmitter. Refer to Transmitter Programming.
Did you complete the replacement?
Go to Step 12
--
12
Perform the programming procedure. Refer to Transmitter Programming.
Did the drivers information center (DIC) beep and display a message ready for next fob?
Go to Step 14
Go to Step 13
13
Replace the remote control door lock receiver (RCDLR). Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
Go to Step 14
--
14
Operate the system in order to verify the repair.
Did you correct the condition?
SOURCE: 2005 cadillac sts remote transmitter
This is the procedure for a reprogram of the remote's from the factory service manual, if it doesn't work then u may have a receiver issue.
Use this Procedure for Vehicles with
Driver Information Center Buttons
This information is in your Owners Manual in the
Drivers Information Center Section.
1. Insert Key and turn to ON position so you can access Driver Information Center
2. Press the vehicle information button until
PRESS TO RELEARN REMOTE KEY displays
3. Press the set/reset button until
REMOTE KEY LEARNING ACTIVE displays
4. Press and hold the lock and unlock buttons on the first keyless remote at the same
time for approximatley 15 seconds. A chime will sound indicating that the remote is
programmed.
5. To program additional remotes at this time repeat step 3.
This vehicle can have a maximum of eight remotes programmed.
6. To exit programming mode turn key off and remove key.
Test remote(s).
Use this Procedure for Vehicles without
Drivers Information Center Buttons
To access this display, the vehicle must be in Park (P) with key in the on position (as far
as you can go without cranking engine)
1. Press the trip odometer reset stem until RELEARN REMOTE KEY displays.
2. Press and hold the trip odometer reset stem for three seconds.
The message REMOTE KEY LEARNING ACTIVE will display
3. Press and hold the lock and unlock buttons on the first keyless remote at the same
time for approximately 15 seconds. A chime will sound indicating that the remote is
programmed.
4. To program additional remotes at this time repeat step 3.
This vehicle can have a maximum of eight remotes programmed.
5. To exit programming mode turn key off and remove key.
Test remote(s).
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