AutoCodes – Generic – B1172

B1172 Code - Front Door Lock-Link Switch Left Unlock Circuit Malfunction

Quick Answer

The Rear Body Control Module (RBCM) monitors the Front Door Lock-Link Switch Left Switch. Common causes include Faulty Front Door Lock-Link Switch Left, Front Door Lock-Link Switch Left harness is open or shorted, Front Door Lock-Link Switch Left circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B1172 indicates Front Door Lock-Link Switch Left Unlock Circuit Malfunction.
Common causes: Common causes include Faulty Front Door Lock-Link Switch Left, Front Door Lock-Link Switch Left harness is open or shorted, Front Door Lock-Link Switch Left circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,650

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B1172 Description

The Rear Body Control Module (RBCM) monitors the Front Door Lock-Link Switch Left Switch. The RBCM sets the OBDII code when the RBCM detects a short to ground in the Front Door Lock-Link Switch Left Unlock circuit with the Front Door Lock-Link Switch Left Locked.

OBDII Code B1172 - Front Door Lock-Link Switch Left Unlock Circuit Malfunction - AutoCodes.com — B1172 Code - Front Door Lock-Link Switch Left Unlock Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1172?

Faulty Front Door Lock-Link Switch Left
Front Door Lock-Link Switch Left harness is open or shorted
Front Door Lock-Link Switch Left circuit poor electrical connection
Faulty Rear Body Control Module (RBCM)

How to Fix the DTC B1172?

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 B1172 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.

Need more information about the B1172 code?

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Need Help with the Code?

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Information for Specific Makes

B1172 Mazda — Front Door Lock-Link Switch Left Unlock Circuit Malfunction

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.