What Does B007B Mean?
This code indicates the Body Control Module (BCM) or Restraint Control Module (RCM) has detected a fault in the deployment control circuit for the second row left seatbelt pretensioner labeled as 'B'. The pretensioner is designed to retract the seatbelt during a collision to reduce occupant movement. The 'Subfault' designation suggests an internal circuit issue, resistance problem, or communication error within the pretensioner deployment system that prevents proper activation.
Safety Warning
This is a critical safety system fault that compromises occupant protection in a collision. The affected seatbelt pretensioner will not deploy during a crash, increasing injury risk for second row left passengers. Immediate professional diagnosis and repair is required; the vehicle may be unsafe for passenger transport in that seating position.
Common Causes
45%
Faulty or damaged seatbelt pretensioner unit with internal circuit failure or resistance out of specification
30%
Damaged, corroded, or loose wiring harness connections between the pretensioner and restraint control module
15%
Faulty Restraint Control Module (RCM) or Body Control Module with internal deployment control circuit failure
10%
Previous collision or deployment event that was not properly reset or cleared from system memory
Diagnostic Steps
1
Step 1: Perform visual inspection of the second row left seatbelt pretensioner, buckle assembly, and associated wiring harness for physical damage, corrosion, or signs of previous deployment (torn fabric covers, deformed housing)
2
Step 2: Using a digital multimeter, measure resistance across the pretensioner connector terminals (disconnected from harness) and compare to manufacturer specifications (typically 2-4 ohms); check for open circuits, short circuits to ground, or excessive resistance
3
Step 3: Inspect the pretensioner harness connector for bent pins, corrosion, or moisture intrusion; clean and apply dielectric grease if contamination is found; verify continuity from pretensioner connector back to the RCM connector
4
Step 4: Check voltage supply and ground circuits at the pretensioner connector with ignition on (engine off) using multimeter; verify proper battery voltage on supply circuit and less than 0.5 ohms resistance on ground circuit
5
Step 5: If all circuits test within specification, the pretensioner unit itself is likely faulty and should be replaced; if wiring shows faults, repair harness and retest
6
Step 6: After repairs, clear codes, perform system initialization procedure as specified by manufacturer, and verify proper system operation through self-test function; confirm airbag warning lamp extinguishes
Estimated Repair Cost
$300 - $800
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or Restraint Control Module (RCM) has detected a fault in the deployment control circuit for the second row left seatbelt pretensioner labeled as 'B'. The pretensioner is designed to retract the seatbelt during a collision to reduce occupant movement...
The most common cause of B007B (Second Row Left Seatbelt Pretensioner "B" Deployment Control (Subfault)) is: Faulty or damaged seatbelt pretensioner unit with internal circuit failure or resistance out of specification
Typical repair costs for B007B range from $300 to $800, 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 affected seatbelt pretensioner will not deploy during a crash, increasing injury risk for second row left passengers. Immediate professional diagnosis and repair is required; the vehicle may be unsafe for passenger transport in that seating position.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B007B to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Passive Safety System
Difficulty
Type
Generic (SAE)
Recommended Tools
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