AutoCodes – Cadillac – B3157 Cadillac

B3157 Cadillac Code - Right Front Lock Switch Circuit Low

Quick Answer

The switch that failed and generated the Diagnostic Trouble Code (DTC) is wired to either the Driver Door Switch Assembly (DDSA) or the Passenger Front Door Module (PDM). Common causes include Faulty Right Front Power Door Lock Switch, Right Front Power Door Lock Switch harness is open or shorted, Right Front Power Door Lock 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: B3157 Cadillac indicates Right Front Lock Switch Circuit Low.
Common causes: Common causes include Faulty Right Front Power Door Lock Switch, Right Front Power Door Lock Switch harness is open or shorted, Right Front Power Door Lock 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 1,136

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3157 Cadillac Description

The switch that failed and generated the Diagnostic Trouble Code (DTC) is wired to either the Driver Door Switch Assembly (DDSA) or the Passenger Front Door Module (PDM). When a door lock switch is activated to the Lock or Unlock function, the DDSA or PDM receives the switch input and sends the information on, via the Serial Data Class 2 communications line, to the Rear Integration Module (RIM), which is the master of all lock operations. If the RIM determines that the message is a valid request and conditions are correct for a door lock function to occur, it sends its OK back to all the door modules to Lock or Unlock the doors. Each door module supplies power and ground to its associated lock actuator to Lock or Unlock the associated door.

OBDII Code B3157 Cadillac - Right Front Lock Switch Circuit Low - AutoCodes.com — B3157 Cadillac Code - Right Front Lock Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3157 Cadillac?

Faulty Right Front Power Door Lock Switch
Right Front Power Door Lock Switch harness is open or shorted
Right Front Power Door Lock Switch circuit poor electrical connection
Faulty Passenger Front Door Module (PDM)

How to Fix the DTC B3157 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 B3157 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 B3157 Cadillac Code

1. What does the OBDII code B3157 mean for a Cadillac?

The B3157 code indicates a "Right Front Lock Switch Circuit Low," meaning the electrical circuit for the right front lock switch is showing a low voltage condition.

2. What are the common symptoms of the B3157 code?

Symptoms may include the right front door lock not responding to commands, issues with remote locking/unlocking, or a door lock warning light on the dashboard.

3. What causes the B3157 code to trigger?

Possible causes include a faulty right front door lock switch, damaged wiring or connectors, a short to ground in the circuit, or a failing door lock actuator.

4. How do I diagnose the B3157 code on a Cadillac?

Start by inspecting the wiring and connectors for the right front lock switch for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.

5. Can the B3157 code affect other vehicle systems?

Not directly, but it can cause inconvenience with locking/unlocking and may prevent full functionality of keyless entry systems.

6. How is the B3157 code repaired?

Repairs may involve replacing the right front door lock switch, repairing damaged wiring, cleaning corroded connectors, or replacing the door lock actuator if it's faulty.

7. Is the B3157 code specific to Cadillacs?

While the code is part of the GM-specific code set, it primarily applies to Cadillac models with advanced door lock systems.

8. Can I still drive my Cadillac with the B3157 code?

Yes, the vehicle is safe to drive, but the door lock issue may cause inconvenience or security concerns.

9. How much does it typically cost to fix a B3157 code?

Repair costs can range from $100 to $300 depending on whether the issue is with the switch, wiring, or actuator, and labor costs in your area.

10. Can I fix the B3157 code myself?

If you're comfortable with basic electrical troubleshooting, you may be able to inspect and repair the wiring or replace the switch. For complex issues, professional assistance is recommended.