Fault Family System: Body (B-Codes) 42 SAE Codes

SRS Seatbelt Pyrotechnic Actuator Deployment

Diagnostic & Technical Explanation

Code B0070 (Driver Seat Belt Pretensioner A Deployment Control) sets when the SRS module cannot verify correct igniter-circuit resistance for a pyrotechnic seat belt device -- a pretensioner that snugs the belt at the start of a crash, a load limiter stage that controls belt payout after the pretensioner fires, or an inflatable belt airbag chamber woven into the belt webbing. All three device types are triggered from the same low-energy squib circuit design as frontal and side airbags, so the diagnosis is identical: verify circuit resistance, look for a corroded seat-mounted connector, and check for a chafed harness where the seat belt retractor harness passes through the B-pillar or seat frame. Because these are one-time pyrotechnic actuators, the module disables that stage until the fault is corrected, and any suspect connector must be treated as a live squib circuit until the battery is disconnected.

These 42 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 42 times.

Codes in this family (42)

Code	Definition	Repair coverage
B0070	Driver Seat Belt Pretensioner A Deployment Control	4 ranked fixes
B0071	First Row Center Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0072	Passenger Seat Belt Pretensioner A Deployment Control	4 ranked fixes
B0073	Second Row Left Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0074	Second Row Center Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0075	Second Row Right Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0076	Third Row Left Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0077	Third Row Center Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0078	Third Row Right Seat Belt Pretensioner Deployment Control	4 ranked fixes
B0079	Driver Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B007A	Passenger Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B007B	Second Row Left Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B007C	Second Row Right Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B007D	Second Row Center Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B007E	Driver Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B007F	Passenger Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B0080	Driver Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0081	First Row Center Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0082	Passenger Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0083	Second Row Left Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0084	Second Row Center Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0085	Second Row Right Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0086	Third Row Left Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0087	Third Row Center Seat Belt Load Limiter Deployment Control	4 ranked fixes
B0088	Third Row Right Seat Belt Load Limiter Deployment Control	4 ranked fixes
B00E0	Third Row Left Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B00E1	Third Row Right Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B00E2	Third Row Center Seat Belt Pretensioner B Deployment Control	4 ranked fixes
B00E3	Second Row Left Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B00E4	Second Row Right Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B00E5	Second Row Center Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B00E6	Third Row Right Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B00E7	Third Row Left Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B00E8	Third Row Center Seat Belt Pretensioner C Deployment Control	4 ranked fixes
B00F0	Driver Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F1	Passenger Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F2	Second Row Left Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F3	Second Row Center Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F4	Second Row Right Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F5	Third Row Left Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F6	Third Row Center Inflatable Seat Belt Deployment Control	4 ranked fixes
B00F7	Third Row Right Inflatable Seat Belt Deployment Control	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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