AutoCodes – Cadillac – U1154 Cadillac

U1154 Cadillac Code - Lost Communications With Rear Seat Entertainment Assembly

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Seat Entertainment (RSE) Assembly, Rear Seat Entertainment Assembly harness is open or shorted, Rear Seat Entertainment Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U1154 Cadillac indicates Lost Communications With Rear Seat Entertainment Assembly.
Common causes: Common causes include Faulty Rear Seat Entertainment (RSE) Assembly, Rear Seat Entertainment Assembly harness is open or shorted, Rear Seat Entertainment Assembly circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 503

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1154 Cadillac Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1154 is set.

OBDII Code U1154 Cadillac - Lost Communications With Rear Seat Entertainment Assembly - AutoCodes.com — U1154 Cadillac Code - Lost Communications With Rear Seat Entertainment Assembly

What does this mean?

What are the Possible Causes of the DTC U1154 Cadillac?

Faulty Rear Seat Entertainment (RSE) Assembly
Rear Seat Entertainment Assembly harness is open or shorted
Rear Seat Entertainment Assembly circuit poor electrical connection

How to Fix the DTC U1154 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1154 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1154 Cadillac Code

1. What are the common symptoms of OBDII code U1154 in a Cadillac related to lost communications with rear seat entertainment assembly?

- Common symptoms include a non-functioning rear seat entertainment system, loss of audio or video output, and error messages on the display.

2. What are the possible causes of OBDII code U1154 in a Cadillac indicating lost communications with the rear seat entertainment assembly?

- Possible causes include a faulty rear seat entertainment assembly unit, damaged wiring or connectors, issues with the control module, or software malfunctions.

3. How can I diagnose the cause of OBDII code U1154 in my Cadillac related to lost communications with the rear seat entertainment assembly?

- Diagnose the issue by checking the wiring and connectors for damage, testing the rear seat entertainment assembly unit, and using a diagnostic tool to communicate with the control module.

4. Can the OBDII code U1154 in a Cadillac be cleared/reset, or does it require repair to resolve the communication issue with the rear seat entertainment assembly?

- The code can be cleared/reset, but it is recommended to diagnose and repair the underlying issue to ensure proper functionality of the rear seat entertainment system.

5. Are there any common repair tips for addressing OBDII code U1154 in a Cadillac related to lost communications with the rear seat entertainment assembly?

- Verify all connections are secure, inspect for any visible damage to wiring, reset the code and retest the system, and consider seeking professional help if the issue persists.

6. Is it safe to continue driving my Cadillac with OBDII code U1154 indicating lost communications with the rear seat entertainment assembly?

- It is generally safe to drive the vehicle with this code, but the rear seat entertainment system may not function until the issue is diagnosed and repaired.

7. Can a DIY enthusiast with basic automotive knowledge fix OBDII code U1154 in a Cadillac related to lost communications with the rear seat entertainment assembly?

- Depending on the cause, some basic repairs like checking connections or resetting the code can be attempted by DIY enthusiasts. However, complex issues may require professional assistance.

8. How much can I expect to pay for repairing OBDII code U1154 indicating lost communications with the rear seat entertainment assembly in a Cadillac?

- Repair costs can vary depending on the exact cause, but expenses may range from a simple connector repair to a replacement of the rear seat entertainment assembly unit, potentially costing a few hundred to over a thousand dollars.

9. Will fixing OBDII code U1154 in a Cadillac related to lost communications with the rear seat entertainment assembly affect the vehicle's overall performance?

- Resolving this code should primarily restore the functionality of the rear seat entertainment system and not significantly impact the vehicle's overall performance or drivability.

10. Can extreme weather conditions or battery issues trigger OBDII code U1154 in a Cadillac for lost communications with the rear seat entertainment assembly?

- While extreme weather or battery issues can potentially affect electrical systems, they are less likely to be direct triggers for this specific communication error.