Code
B1433
MITSUBISHI
B — Body
FL side ABG squib short to BATT
Views:
UK: 8
EN: 12
RU: 8
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (pinched/abraded) between airbag module and front-left squib causing contact with B+
- Corroded or pushed-out connector pin making unintended contact with battery feed
- Faulty front-left airbag squib (internal short)
- Aftermarket equipment or repairs that tapped into a constant B+ circuit and contacted the squib circuit
- Water/moisture ingress at seat connector or in harness creating conductive path to B+
- Faulty airbag control module or connector (less common)
Symptoms
- SRS (airbag) warning light illuminated or flashing on instrument cluster
- Front-left airbag disabled by the airbag control module (possible supplemental restraint system fault)
- DTC B1433 stored in airbag control module memory
- Possible additional SRS related DTCs (seatbelt pretensioner, other squib circuits)
What to check
- Read and record all SRS codes and freeze-frame data with a compatible scan tool
- Confirm vehicle-specific safety procedure: disconnect negative battery terminal and wait required time (manufacturer spec) before working on SRS circuits
- Visual inspection of front-left seat harness, connectors, and routing (seat rail, hinge area, under-seat) for damage, corrosion, or aftermarket splices
- Inspect connector pins for corrosion, bent pins, pushed-back terminals, or foreign material
- Backprobe squib connector with reference to wiring diagram to check for B+ presence when system should be inactive
- Measure squib resistance with connector disconnected from module per service manual
Signal parameters
- Typical squib resistance (front airbag) — consult service manual; commonly around 2–4 Ω (may vary by model)
- Resistance from squib positive to vehicle battery positive when shorted: very low (
- Voltage at squib connector with ignition OFF: expected ~0 V; sustained battery voltage indicates short to B+
- Voltage at squib connector with ignition ON (system powered but not firing): no sustained B+ should appear on squib firing circuits — momentary firing only during deployment test
- Continuity to ground from squib circuit: should be open (high resistance) except during firing event
Diagnostic algorithm
- Safety: Disable SRS power — disconnect negative battery terminal and wait the manufacturer-specified time (typically several minutes) before touching SRS wiring or connectors.
- Retrieve codes and freeze-frame with an SRS-capable scan tool; note any related codes.
- Perform visual inspection of the entire front-left squib wiring path: seat connector, seat rail, harness grommet, door sill, and airbag connector at the module. Look for chafing, pinching, corrosion, or aftermarket taps.
- Disconnect the front-left squib connector at the squib (not at the module) and check pins for damage/corrosion. Replace or repair connector/terminals if required.
- With squib disconnected, measure squib resistance (ohms) at squib leads per service manual. Compare to manufacturer spec. A very low resistance or near zero indicates internal short in squib.
- With squib disconnected, check for battery voltage at the harness side connector with IGN OFF and IGN ON (backprobe carefully). The presence of sustained B+ where none should be present indicates a short to battery in the harness or an incorrect aftermarket connection.
- If voltage to harness pin is present, trace wiring toward source. Isolate sections by disconnecting intermediate connectors (seat module, floor harness) until the short is localized.
- If no B+ is present at the harness side and squib resistance is out of spec, the squib itself is likely defective — replace squib/airbag assembly per service procedures.
- If harness/connector damage is found, repair or replace wiring and terminals using correct crimp pins and insulators. Avoid soldering inside connectors unless specified; ensure correct insulation and routing to prevent future chafing.
- After repair, reconnect, clear codes with scan tool, and cycle ignition to confirm no return of B1433. Verify SRS lamp extinguishes and perform any required system checks or calibrations.
- If doubt remains or module replacement is necessary, consult factory procedures and replacement/initialization steps for the airbag control module.
Likely causes
- Chafed/abraded harness at seat rail or hinge contacting a constant B+ conductor
- Corroded/dirty seat/squib connector causing pins to short to battery feed
- Shorted seat heater/seat wiring nearby that shares routing with squib wiring
- Damaged squib connector from seat removal/installation
Fault status
Status
Front-left airbag squib circuit — short to battery detected. SRS fault stored; airbag may be disabled and SRS warning lamp is on.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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