Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1999SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL ASSEMBLYSERVICE AND REPAIRWITH UY4
1999 Cadillac Seville SLS V8-4.6L VIN Y
With UY4
1999 Cadillac Seville SLS V8-4.6L VIN YSECTION With UY4
Control Assembly Replacement (With UY4)
REMOVAL PROCEDURE
1. Remove the instrument panel center trim plate.
2. Remove the console trim plate.
3. Remove the control assembly bracket fasteners.
4. Disconnect the electrical connector from the control assembly.
5. Remove the control assembly.
6. Remove the control assembly retaining nuts.
7. Remove the control assembly from the bracket.
INSTALLATION PROCEDURE
1. Install the control assembly to the bracket.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the control assembly retaining nuts
Tighten
Tighten the radio retaining nuts to 10 N.m (88 lb in).
3. Install the control assembly to vehicle.
4. Connect the electrical connector to the control assembly.
5. Install the control assembly bracket fasteners.
6. Install the console trim plate.
7. Install the instrument panel center trim plate.
8. Recalibrate the control assembly. Refer to BCM Programming/RPO Configuration in Body Control System.
REMOVAL PROCEDURE
1. Remove the instrument panel center trim plate.
2. Remove the console trim plate.
3. Remove the control assembly bracket fasteners.
4. Disconnect the electrical connector from the control assembly.
5. Remove the control assembly.
6. Remove the control assembly retaining nuts.
7. Remove the control assembly from the bracket.
INSTALLATION PROCEDURE
1. Install the control assembly to the bracket.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the control assembly retaining nuts
Tighten
Tighten the radio retaining nuts to 10 N.m (88 lb in).
3. Install the control assembly to vehicle.
4. Connect the electrical connector to the control assembly.
5. Install the control assembly bracket fasteners.
6. Install the console trim plate.
7. Install the instrument panel center trim plate.
8. Recalibrate the control assembly. Refer to BCM Programming/RPO Configuration in Body Control System.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.