B1700
Passenger's Seatbelt Tension Reducer Circuit Short to Ground
Body Chassis/Safety Seatbelt Pretensioner 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The passenger seatbelt pretensioner circuit has a short to ground, meaning electricity is taking an unintended path directly to ground instead of operating normally. Think of it like a water hose with a hole that's draining the pressure before it reaches the nozzle.

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Symptoms You May Notice
3 known symptoms for this code
Seatbelt warning light illuminated on dashboard
Passenger seatbelt pretensioner fails to activate during collision
Airbag or safety system warning light may also appear
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the resistance and voltage across the pretensioner circuit during operation and self-tests. It expects a specific resistance range when the circuit is powered. A short to ground causes resistance to drop to near zero ohms, triggering a fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Pretensioner Circuit Resistance 4-20 ohms (with proper load) 0-1 ohms (short to ground detected)
Circuit Voltage Drop 11-13 volts <2 volts during activation
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Battery negative terminal
Disconnect and reconnect battery; clear fault code and retest after 50 miles of driving.
2
Seatbelt pretensioner wiring harness
Inspect connector under passenger seat for corrosion, moisture, or damaged pins and reseat connections.
3
Seatbelt pretensioner assembly
Replace the pretensioner unit if wiring checks pass but fault persists.