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.
2013 Cadillac XTS AWDFACTORY OEM SERVICE PROCEDURE
Data Link References
This table identifies which serial data link that a particular device uses for in-vehicle data transmission. Some devices may use more than one data link to communicate. Some devices may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. Not all devices listed will be applicable to all vehicles. Refer to the schematics to determine which devices apply. For the description and operation of these serial data communication circuits, refer to Data Link Communications Description and Operation .
Data Link References
| Code | Device | Data Link Type | Diagnostic Procedure |
|---|---|---|---|
| Schematic Reference: Data Communication Schematics | |||
| A11 | Radio |
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| A20 | Radio/HVAC Controls | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| A26 | HVAC Controls | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| A33 | Media Disc Player | MOST Bus | DTC U0028 |
| B60 | Passenger Presence Sensor | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| B99 | Steering Wheel Angle Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| B117 | Rain Sensor | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| B119 | Multi-axis Acceleration Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| B218L | Side Object Sensor Module - Left | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| B218R | Side Object Sensor Module - Right | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| B233B | Radar Sensor Module - Long Range | Object Bus | DTC U0075 |
| B233LF | Radar Sensor Module - Short Range Left Front | Object Bus | DTC U0075 |
| B233RF | Radar Sensor Module - Short Range Right Front | Object Bus | DTC U0075 |
| B233R | Radar Sensor Module - Short Range Rear | Object Bus | DTC U0075 |
| K9 | Body Control Module |
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| K17 | Electronic Brake Control Module |
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| K18 | Compass Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K19 | Suspension Control Module |
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| K20 | Engine Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K26 | Headlamp Control Module |
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| K27 | Fuel Pump Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K29F | Seat Heating Control Module - Front | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K29R | Seat Heating Control Module - Rear | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K33 | HVAC Control Module |
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| K33A | HVAC Control Module - Auxiliary | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K36 | Inflatable Restraint Sensing and Diagnostic Module |
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| K40 | Seat Memory Control Module |
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| K41 | Front and Rear Parking Assist Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K43 | Power Steering Control Module |
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| K47 | Rear Differential Clutch Control Module |
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| K60 | Steering Column Lock Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K71 | Transmission Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K73 | Telematics Communication Interface Control Module |
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| K74 | Human Machine Interface Control Module |
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| K83 | Parking Brake Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| K84 | Keyless Entry Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| K89 | Immobilizer Control Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K96 | Mirror Control Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K99 | Steering Column Position Control Module | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| K109 | Frontview Camera Module |
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| K124 | Active Safety Control Module |
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| M29L | Headlamp Leveling Actuator - Left | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M29R | Headlamp Leveling Actuator - Right | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M74D | Window Motor - Driver | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M74LR | Window Motor - Left Rear | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M74P | Window Motor - Passenger | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| M74RR | Window Motor - Right Rear | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| P2 | Transmission Shift Lever Position Indicator | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| P16 | Instrument Cluster |
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| P17 | Info Display Module |
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| P29 | Head-Up Display | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| Q8 | Control Solenoid Valve Assembly | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| S52 | Outside Rearview Mirror Switch | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| S79D | Window Switch - Driver | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| S79P | Window Switch - Passenger | Local Interconnect Network (LIN) | DTC U1500-U15FF |
| T3 | Audio Amplifier |
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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.
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