What Does B0085 Mean?
This code indicates a malfunction in the deployment control circuit for the second row right seatbelt load limiter. The Body Control Module (BCM) or Restraint Control Module (RCM) has detected an electrical fault in the load limiter system, which is designed to reduce chest loads during a collision by allowing controlled webbing payout. The subfault designation suggests an internal circuit issue within the load limiter mechanism or its wiring harness.
Safety Warning
This is a critical safety system fault that may prevent proper seatbelt load limiting during a collision, increasing injury risk to the second row right passenger. The vehicle should be repaired immediately as the supplemental restraint system may not function as designed in an accident.
Common Causes
45%
Faulty seatbelt load limiter pretensioner assembly with internal circuit fault
30%
Damaged or corroded wiring harness between RCM/BCM and seatbelt load limiter connector
15%
Water intrusion or corrosion at seatbelt buckle/load limiter connector
10%
Failed Restraint Control Module (RCM) or Body Control Module output driver
Diagnostic Steps
1
Step 1: Perform visual inspection of second row right seatbelt assembly, checking for previous deployment indicators (twisted webbing, damaged components), physical damage, or signs of water intrusion at connectors
2
Step 2: Using a digital multimeter, measure resistance across the load limiter deployment circuit at the connector (typically 2-4 ohms for squib circuit). Compare readings to manufacturer specifications and check for open or short circuits
3
Step 3: Disconnect the seatbelt load limiter connector and inspect terminals for corrosion, bent pins, or moisture. Clean or repair connector as needed and verify proper pin tension
4
Step 4: With ignition OFF and load limiter disconnected, measure resistance of the wiring harness from RCM/BCM connector to seatbelt connector to isolate harness faults (should show less than 5 ohms resistance, infinite ohms to ground)
5
Step 5: Check for proper voltage supply and ground at the load limiter connector with ignition ON (typically 12V battery voltage present). Verify BCM/RCM has proper power and ground circuits
6
Step 6: If all circuits test within specifications, replace the seatbelt pretensioner/load limiter assembly. Clear codes, perform system initialization/calibration per manufacturer procedure, and verify repair with road test
Estimated Repair Cost
$300 - $900
Parts + labor, varies by vehicle and location
This code indicates a malfunction in the deployment control circuit for the second row right seatbelt load limiter. The Body Control Module (BCM) or Restraint Control Module (RCM) has detected an electrical fault in the load limiter system, which is designed to reduce chest loads during a collision ...
The most common cause of B0085 (Second Row Right Seatbelt Load Limiter Deployment Control (Subfault)) is: Faulty seatbelt load limiter pretensioner assembly with internal circuit fault
Typical repair costs for B0085 range from $300 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that may prevent proper seatbelt load limiting during a collision, increasing injury risk to the second row right passenger. The vehicle should be repaired immediately as the supplemental restraint system may not function as designed in an accident.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0085 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Seatbelt Safety System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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