What Does B0049 Mean?
This code indicates a fault in the deployment control circuit for the first stage of the right-side frontal airbag located in the third row of the vehicle. The airbag control module (ACM/SRS module) has detected an electrical or communication subfault in the deployment circuit, which could prevent proper airbag deployment in a collision. This is typically caused by wiring issues, connector problems, or a faulty airbag squib/initiator.
Safety Warning
This is a critical safety system fault that compromises occupant protection in a collision. The third row right airbag may not deploy properly or at all during a crash. Vehicle should not be driven with passengers in the affected seating position until repaired, and repair should be completed immediately by a qualified technician.
Common Causes
40%
Damaged or corroded wiring harness and connectors in third row seat area due to moisture intrusion, seat movement, or physical damage
30%
Faulty airbag squib/initiator circuit within the third row right frontal airbag module itself
20%
Loose or disconnected airbag connector at seat or under carpet due to service work or seat removal
10%
Faulty airbag control module (ACM/SRS module) with internal circuit failure affecting third row deployment control
Diagnostic Steps
1
Step 1: Perform visual inspection of third row right seat area for any signs of previous collision damage, water intrusion, or recent service work. Check airbag warning light status and document all stored airbag codes.
2
Step 2: Disconnect battery and wait 10 minutes minimum for airbag system capacitor discharge. Remove third row right seat trim and locate the airbag connector. Inspect connector and terminals for corrosion, bent pins, or moisture damage.
3
Step 3: Using a multimeter, measure resistance across the airbag squib terminals at the harness side (airbag disconnected). Normal reading should be 2-3 ohms typically. Check for short to ground (should read OL/infinite resistance) and short to power.
4
Step 4: If wiring tests pass, measure resistance at the airbag module squib connector (airbag side). Compare readings to manufacturer specifications. If out of range, replace airbag assembly.
5
Step 5: Inspect wiring harness routing from airbag to ACM under third row seat and carpet for chafing, pinching, or damage. Check continuity of all circuits from airbag connector to ACM connector.
6
Step 6: Reconnect all components, clear codes, and perform airbag system self-test using diagnostic tool. Verify airbag warning light extinguishes and code does not return. If code returns immediately, suspect ACM internal fault.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
This code indicates a fault in the deployment control circuit for the first stage of the right-side frontal airbag located in the third row of the vehicle. The airbag control module (ACM/SRS module) has detected an electrical or communication subfault in the deployment circuit, which could prevent p...
The most common cause of B0049 (Third Row Right Frontal Stage 1 Deployment Control (Subfault)) is: Damaged or corroded wiring harness and connectors in third row seat area due to moisture intrusion, seat movement, or physical damage
Typical repair costs for B0049 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that compromises occupant protection in a collision. The third row right airbag may not deploy properly or at all during a crash. Vehicle should not be driven with passengers in the affected seating position until repaired, and repair should be completed immediately by a qualified technician.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0049 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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