AutoCodes – Cadillac – U1558 Cadillac

U1558 Cadillac Code - Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Passenger Seat Heating and Cooling Switch, Passenger Seat Heating and Cooling Switch harness is open or shorted, Passenger Seat Heating and Cooling Switch 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: U1558 Cadillac indicates Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus.
Common causes: Common causes include Faulty Passenger Seat Heating and Cooling Switch, Passenger Seat Heating and Cooling Switch harness is open or shorted, Passenger Seat Heating and Cooling Switch 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 540

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 Jun 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1558 Cadillac Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Body Control Module (BCM) from the Passenger Seat Heating and Cooling Switch has not been received.

OBDII Code U1558 Cadillac - Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus - AutoCodes.com — U1558 Cadillac Code - Body Control Module Lost Communication With Passenger Seat Heating and Cooling Switch On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1558 Cadillac?

Faulty Passenger Seat Heating and Cooling Switch
Passenger Seat Heating and Cooling Switch harness is open or shorted
Passenger Seat Heating and Cooling Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC U1558 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 U1558 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 U1558 Cadillac Code

1. What are the common symptoms of OBDII code U1558 in a Cadillac related to the Body Control Module losing communication with the passenger seat heating and cooling switch on the LIN bus?

The common symptoms include non-functional passenger seat heating and cooling controls, seat heating or cooling not activating, and warning lights on the dashboard related to the seat functions.

2. What are the possible causes of OBDII code U1558 in a Cadillac signaling a communication issue between the Body Control Module and the passenger seat heating and cooling switch?

Common causes may include a faulty passenger seat heating and cooling switch, damaged wiring or connectors in the LIN bus communication circuit, a malfunctioning Body Control Module, or software issues.

3. How can I diagnose the OBDII code U1558 in a Cadillac when the Body Control Module loses communication with the passenger seat heating and cooling switch?

Diagnosis involves checking the wiring and connectors for any visible damage, testing the passenger seat heating and cooling switch for functionality, and using a diagnostic scanner to communicate with the Body Control Module for fault codes and data.

4. Is it safe to continue driving with OBDII code U1558 in a Cadillac related to the Body Control Module issue with the passenger seat heating and cooling switch?

It is generally safe to drive, but it is recommended to address the issue promptly to ensure the proper functioning of the passenger seat heating and cooling system and avoid potential further complications.

5. Can I repair OBDII code U1558 in a Cadillac related to the Body Control Module communication problem with the passenger seat heating and cooling switch on the LIN bus myself?

Depending on your skill level and access to tools, you may be able to repair the issue yourself by inspecting the wiring, connectors, and switch for any visible damage or by resetting the Body Control Module. However, for more complex issues, it is advisable to consult a professional mechanic.

6. How much does it typically cost to repair OBDII code U1558 in a Cadillac associated with the Body Control Module losing communication with the passenger seat heating and cooling switch?

The cost of repair can vary depending on the exact cause of the issue. Repairs may range from a simple connector replacement to a more involved switch or module replacement, costing anywhere from $100 to $500 or more.

7. Are there any preventive measures to avoid encountering OBDII code U1558 in a Cadillac due to communication problems with the passenger seat heating and cooling switch?

Regularly inspecting the wiring and connectors, avoiding excessive force when using the seat controls, and promptly addressing any warning lights related to the seat functions can help prevent issues with the Body Control Module communication.

8. How long does it typically take to repair OBDII code U1558 in a Cadillac associated with the Body Control Module communication issue with the passenger seat heating and cooling switch?

The repair time can vary depending on the extent of the problem and the availability of parts. Simple fixes like reconnecting a loose wire may take less than an hour, while more complex repairs involving module replacement may take several hours or more.

9. Can OBDII code U1558 in a Cadillac related to the Body Control Module losing communication with the passenger seat heating and cooling switch affect other vehicle systems?

While the primary impact is on the passenger seat heating and cooling controls, issues with the Body Control Module communication can sometimes lead to related problems with other vehicle systems connected to the LIN bus network. Regular diagnosis and maintenance can help prevent such issues.

10. Is it necessary to clear the OBDII code U1558 in a Cadillac after repairing the Body Control Module communication issue with the passenger seat heating and cooling switch?

Yes, it is recommended to clear the fault code using a diagnostic scanner after repairing the issue to ensure that the warning lights are reset and the system functions properly. If the problem persists, further diagnosis may be required.