Code
B1131
HUMMER
B — Body
Passenger Pretensioner Loop Resistance High
Views:
UK: 8
EN: 15
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or high-resistance connection in passenger pretensioner wiring
- Corroded/contaminated connector at pretensioner or SRS module
- Damaged harness under passenger seat (pinched, broken, or chafed wires)
- Faulty passenger pretensioner (squib coil degraded)
- Poor repair or incorrect replacement pretensioner
- Water intrusion or seat contamination affecting connector
Symptoms
- Airbag/SRS warning lamp illuminated
- Passenger pretensioner may be disabled (no visible symptoms until crash)
- Related occupant restraint warnings or diagnostic trouble codes stored
- Possible inability to pass vehicle safety inspection until fixed
What to check
- Use a scan tool to read stored SRS codes and freeze-frame data
- Visually inspect passenger seat area and underside for damaged wiring or connectors
- Inspect pretensioner connector and pins for corrosion, bent pins, or contamination
- Confirm seat mounting and seat track area for harness chafing points
- Check vehicle history for prior deployment/repairs to passenger pretensioner or seat
- Verify battery voltage and perform tests with correct SRS safety procedures in place
Signal parameters
- Expected: low loop resistance (manufacturer-specified value). Many pretensioner squibs measure in the low-ohm range; consult the HUMMER service manual for the exact spec.
- Fault condition: resistance higher than manufacturer threshold or open/infinite resistance
- Continuity: continuity should exist between pretensioner connector pins and SRS module squib pins with low resistance
- Do not apply more than a low-voltage ohmmeter test without following SRS manufacturer instructions
Diagnostic algorithm
- Follow SRS safety procedure: ignition OFF, disconnect negative battery terminal and wait the specified time in the service manual before working on SRS wiring.
- Use a capable scan tool to confirm B1131, note freeze frame and clear codes (verify reappearance after tests).
- Perform a careful visual inspection under the passenger seat: look for disconnected connectors, crushed or chewed wiring, water intrusion, or aftermarket modifications.
- With battery disconnected, disconnect the pretensioner connector and inspect pins for corrosion or damage. Repair or replace connector as needed.
- Measure resistance across the pretensioner squib at the connector and compare to service manual specification. If resistance is high or open, suspect squib or wiring.
- Check continuity between the pretensioner connector and the SRS module connector. Locate and repair any high-resistance sections or opens (repair splices or replace harness as required).
- If harness and connectors are good but resistance remains high, replace the passenger pretensioner with a proper OEM part (do not reuse a deployed squib).
- After repairs, reconnect battery, clear codes with scan tool, and perform SRS system self-test. Verify the B1131 does not return and the airbag lamp extinguishes.
- If code persists after wiring and component replacement, follow manufacturer procedures to test/replace the SRS control module or consult dealer-level diagnostics.
Likely causes
- Disconnected or corroded connector at the passenger pretensioner (under seat)
- Wiring damage where the harness moves with the seat (most common)
- Failed pretensioner squib (after prior deployment or age-related failure)
Fault status
Status
Passenger pretensioner loop resistance high. The SRS control module has detected higher-than-allowed resistance in the passenger pretensioner circuit. This will illuminate the airbag warning lamp and may disable the passenger pretensioner. Do not attempt repairs without following SRS safety procedures; have the circuit inspected and repaired by a qualified technician.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email