AutoCodes – Cadillac – B1148 Cadillac

B1148 Cadillac Code - Passenger Side Air Bag System Malfunction

Quick Answer

When the ignition switch is turned to RUN position, Side Impact Sensing Module (SISM) will perform tests to diagnose critical internal malfunctions. Common causes include Faulty Passenger Side Air Bag, Passenger Side Air Bag harness is open or shorted, Passenger Side Air Bag 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: B1148 Cadillac indicates Passenger Side Air Bag System Malfunction.
Common causes: Common causes include Faulty Passenger Side Air Bag, Passenger Side Air Bag harness is open or shorted, Passenger Side Air Bag 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 734

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 Aug 03, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1148 Cadillac Description

When the ignition switch is turned to RUN position, Side Impact Sensing Module (SISM) will perform tests to diagnose critical internal malfunctions. The SISM then tests the deployment loop for an open, short to ground or ignition, high or low resistance, or reserve energy failure condition. SISM transmits a 300-millisecond, 50 percent duty cycle, pulse width modulated signal to Sensing and Diagnostic Module (SDM) over-circuit 2108 to indicate normal operation and no malfunctions. SISM communicates that it is turning off (ignition OFF) by sending a 20 millisecond, 50 percent duty cycle, pulse width modulated signal. The Diagnostic Trouble Code (DTC) sets when SDM receives a pulse width signal other than specified for normal operation, or no signal. SISM performs tests during POWER-ON, CONTINUOUS MONITORING, and asynchronously.

OBDII Code B1148 Cadillac - Passenger Side Air Bag System Malfunction - AutoCodes.com — B1148 Cadillac Code - Passenger Side Air Bag System Malfunction

What does this mean?

What are the Possible Causes of the DTC B1148 Cadillac?

Faulty Passenger Side Air Bag
Passenger Side Air Bag harness is open or shorted
Passenger Side Air Bag circuit poor electrical connection
Faulty Side Impact Sensing Module (SISM)
Faulty Sensing and Diagnostic Module (SDM)

How to Fix the DTC B1148 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 B1148 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.

Need more information about the B1148 Cadillac code?

Need more information on how to fix the B1148 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1148 Cadillac code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1148 Cadillac Code

1. What are common symptoms of OBDII code B1148 in a Cadillac related to the passenger side airbag system malfunction?

The common symptoms include the airbag warning light staying illuminated on the dashboard and a message indicating an issue with the passenger side airbag system.

2. What are the possible causes of OBDII code B1148 in a Cadillac indicating a malfunction in the passenger side airbag system?

Possible causes include a faulty passenger airbag module, damaged wiring or connectors, or a problem with the airbag control module.

3. How can I diagnose the root cause of OBDII code B1148 in my Cadillac related to the passenger side airbag system malfunction?

Diagnosing the issue usually involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connectors for damage, and testing the components of the passenger side airbag system.

4. Can I still drive my Cadillac with OBDII code B1148 indicating a passenger side airbag system malfunction?

It is not recommended to drive the vehicle with a malfunctioning airbag system, as it may not deploy properly in the event of an accident. It is advisable to have the issue addressed by a professional as soon as possible.

5. How can I reset OBDII code B1148 in my Cadillac after repairing the passenger side airbag system issue?

After repairing the underlying issue with the passenger side airbag system, you can reset the OBDII code by using an OBDII scanner to clear the code from the vehicle's memory.

6. Are there any DIY repair tips for fixing OBDII code B1148 related to the passenger side airbag system malfunction in a Cadillac?

While some basic inspections and checks can be done by DIY enthusiasts, repairing the passenger side airbag system should be left to a professional due to the critical safety nature of the airbag system.

7. How much does it typically cost to repair OBDII code B1148 in a Cadillac due to a passenger side airbag system malfunction?

The cost of repair can vary depending on the specific issue causing the malfunction, but it is recommended to budget for diagnostic fees, parts replacement, and labor costs when addressing this problem.

8. Can OBDII code B1148 in a Cadillac be triggered by a loose connection or a disconnected component in the passenger side airbag system?

Yes, a loose connection or a disconnected component within the passenger side airbag system can trigger the B1148 code, indicating a malfunction in the system.

9. Will OBDII code B1148 in a Cadillac reset on its own after fixing the passenger side airbag system issue?

In some cases, the code may reset on its own after the issue has been resolved and the vehicle has been driven for a certain period. However, it is recommended to use an OBDII scanner to clear the code manually.

10. Is it safe to attempt to repair OBDII code B1148 related to the passenger side airbag system malfunction in a Cadillac without prior experience?

Due to the critical safety implications of the airbag system, it is not recommended to attempt repairs on the passenger side airbag system without prior experience or proper training. It is best to seek assistance from a qualified technician.