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.
1999 Cadillac Eldorado BaseFACTORY OEM SERVICE PROCEDURE
Memory System
- Description
- Operation
- Component Locations
- Trouble Shooting
- Self-Diagnostic System
- Memory Seat Module (MSM) Diagnostic Tests
- Notes
- DTC B0846: Battery 2 Out Of Range
- DTC B0856: 5-Volt Reference Out Of Range
- DTC B1656: EEPROM Write Error & DTC B1658: EEPROM Checksum Error
- DTC B1982: Source/Battery Voltage High
- DTC B1983: Source/Battery Voltage Low
- DTC B2101: Recline Aft Switch Failed, B2102: Recline Forward Switch Failed, B2103: Rear Vertical Down Switch Failed, B2104: Rear Vertical Up Switch Failed, B2105: Horizontal Aft Switch Failed, B2106: Horizontal Forward Switch Failed, B2107: Front Vertical Down Switch Failed Or B2108: Front Vertical Up Switch Failed
- DTC B2109: Lumbar Aft (In) Switch Failed Or DTC B2110: Lumbar Forward Switch Failed
- DTC B2111: Lumbar Down Switch Failed (Al2) Or DTC B2112: Lumbar Up Switch Failed (Al2)
- DTC B2111: Lumbar Down Switch Failed (Am3)
- DTC B2112: Lumbar Up Switch Failed (Am3)
- DTC B2115: Recline Sensor Failed, B2116: Rear Vertical Sensor Failed, B2117: Horizontal Sensor Failed, B2118: Front Vertical Sensor Failed, B2119: Lumbar Forward/Aft Sensor Failed Or B2120: Lumbar Up/Down Sensor Failed (Al2)
- DTC B2120: Lumbar Up/Down Sensor Failed (Am3)
- DTC B2130: Seat Motor Failure
- Memory Mirror Module (Mmm) Diagnostic Tests
- DTC B1656: EEPROM Write Error Or DTC B1658: EEPROM Checksum Error
- DTC B1982: Battery/Source Voltage High Or DTC B1983: Battery/Source Voltage Low
- DTC B2130: Memory 1 Key Malfunction, B2131: Memory 2 Key Malfunction, B2132: Memory Exit Key Malfunction Or B2133: Memory Set Key Malfunction
- DTC B2140: Mirror Up Switch Malfunction, B2141: Mirror Down Switch Malfunction, B2142: Mirror Left Switch Malfunction Or B2143: Mirror Right Switch Malfunction
- DTC B2144: Driver Mirror Vertical Sensor Short To Ground, B2146: Driver Mirror Horizontal Sensor Short To Ground, B2148: Passenger Mirror Vertical Sensor Short To Ground Or B2150: Passenger Mirror Horizontal Sensor Short To Ground
- DTC B2145: Driver Mirror Vertical Sensor Short To Battery, B2147: Driver Mirror Horizontal Sensor Short To Battery, B2149: Passenger Mirror Vertical Sensor Short To Battery Or B2151: Passenger Mirror Horizontal Sensor Short To Battery
- System Tests
- Notes
- Power Seat Inoperative
- Power Seat Inoperative In One Direction
- Left Lumbar Support Inoperative
- Left Lumbar Support Does Not Move Up Or Down
- Both Power Mirrors Inoperative
- Mirror Memory Function Switch Inoperative
- Both Power Mirrors Memory Inoperative In Any Direction
- Left Mirror Does Not Move Up & Down
- Left Mirror Does Not Move Left & Right
- Right Mirror Does Not Move Up & Down
- Right Mirror Does Not Move Left & Right
- Removal & Installation
- Wiring Diagrams
Factory Service Tools
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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.