Code
B1C36
MITSUBISHI
B — Body
DR.lap pretensioner circuit SHT.
Views:
UK: 15
EN: 28
RU: 17
AI status
Completed
Completed
100%
Causes
- Damaged/chewed wiring in driver seat harness (slider, recliner, or connector area)
- Corroded/moist or contaminated connector pins at pretensioner or airbag control module
- Shorted or internally failed pretensioner (squib) assembly
- Poor/cracked insulation from previous repairs or seat movement
- Short in wiring to ground or battery positive (chafing to chassis or a power feed)
- Faulty or corroded connector at the airbag control module (SDM)
Symptoms
- SRS (airbag) warning lamp ON
- Driver seat belt pretensioner circuit fault stored in airbag control unit
- Possible loss of pretensioner function for driver lap belt
- Codes cannot be cleared until cause is corrected
- Inconsistent codes when wiggle-testing wiring harness
What to check
- Record the exact DTC and freeze-frame data with a capable scan tool
- Visual inspection of driver seat wiring, seat base, and pretensioner connector for damage or corrosion
- Check connectors at the pretensioner and the airbag control module for loose pins or corrosion
- Measure resistance of pretensioner squib with battery disconnected (ohmmeter)
- Check for continuity/shorts to chassis ground or to battery positive on the pretensioner wiring
- Wiggle test harness while monitoring resistance or live data (with safety procedures followed)
Signal parameters
- Typical pretensioner (squib) resistance: approximately 0.5–3 Ω (measure with battery disconnected). (Manufacturer spec may vary — consult service manual.)
- Open circuit: OL/infinite Ω (indicates open/broken circuit)
- Short to ground/power: near 0 Ω between squib wire and chassis/battery
- No significant voltage should be applied to squib connectors during testing — only use passive ohmmeter continuity checks with the battery disconnected
Diagnostic algorithm
- Safety first: Turn ignition OFF, disconnect negative battery terminal and wait a safe interval (manufacturer recommendation; typically at least 3–10 minutes) before touching SRS connectors.
- Use a scan tool to confirm B1C36 is current and note any related SRS codes. Record freeze-frame data.
- Perform a careful visual inspection of the driver seat area: seat track, recliner area, seat belt pretensioner connector, and harness routing. Look for chafing, broken insulation, corrosion, or evidence of water/damage.
- With battery still disconnected, unplug the pretensioner connector and measure resistance across the pretensioner terminals. Compare to manufacturer spec (commonly ~0.5–3 Ω). If the resistance is very low or zero, the pretensioner may be shorted; if open/OL, the pretensioner is open.
- Measure resistance from each pretensioner lead to chassis ground and to vehicle battery positive (with battery disconnected) to identify short to ground or power. Near-zero readings indicate a short path.
- If a short is indicated in the harness, isolate sections by disconnecting connectors along the circuit (seat connector, floor harness connector, airbag control unit connector) and test each segment to locate the shorted section.
- If the harness shows damage, repair or replace the affected wiring and connectors using correct SRS-quality terminals and routing. If the pretensioner shows an internal short or damage, replace the pretensioner assembly and associated connector per manufacturer procedures.
- Inspect and test the airbag control module connector and related fuses. Replace/repair any corroded pins or damaged module-side wiring as required.
- After repairs, reconnect everything, reconnect battery, clear codes with a scan tool, and perform a system check to verify the SRS light goes out and no new codes (or repeats) are stored.
- If code persists after harness and pretensioner checks/replacement, consult the manufacturer repair manual for module-level diagnostics and consider airbag control module testing/repair at an authorized facility.
Likely causes
- Short between pretensioner squib lead and chassis ground caused by harness chafe under the seat
- Connector pin(s) contaminated or pushed out, creating low-resistance path
- Pretensioner element internally shorted due to water ingress or manufacturing failure
- Incorrect wiring from previous aftermarket installation/repair
- Short at seat belt pretensioner connector where harness flexes
Fault status
Status
Driver lap pretensioner circuit short detected — possible short to ground or power, connector/harness fault, or pretensioner internal failure. SRS warning lamp is likely illuminated.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hr
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