B1926

Code

Other B — Body

Air Bag Passenger Pressure Switch Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 22 EN: 32 RU: 25

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Page language: EN

Causes

Open, short or high-resistance wiring in the passenger pressure/occupant detection switch circuit
Corroded, loose or disconnected connector at the pressure switch or airbag module
Failed passenger pressure/occupant detection switch or sensor
Water intrusion, seat foam damage or foreign object interfering with sensor
Aftermarket seat cover or seat repair altering sensor behavior
Faulty SRS/passenger airbag control module or internal connector

Symptoms

SRS / airbag warning light illuminated
Passenger airbag OFF/ON indicator incorrect or not changing with occupancy
Passenger presence detection not working (occupant not recognized or always recognized)
DTC present in SRS control module memory
Possible deactivation of passenger airbag when it should be active (safety concern)

What to check

Read and record all SRS-related codes and freeze-frame data with a capable scan tool
Visually inspect the passenger seat area for water, debris, damaged foam or aftermarket covers
Inspect connectors at the passenger pressure switch and the SRS control module for corrosion, bent pins or looseness
Check seat wiring harness routing for chafing, pinching or broken wires (under seat, track area)
Verify proper grounding and battery voltage at SRS module connectors (follow vehicle-specific SRS disable procedure before probing)
Use scan tool to monitor passenger pressure sensor status/values while applying weight to seat

Signal parameters

Reference supply: typically 5 V or vehicle-specific regulated reference (check OEM specs)
Switch/sensor output: often a low/high or variable voltage signal within 0–5 V range; may be discrete open/closed in some systems
Expected continuity: closed switch should show low resistance; open switch high resistance/infinite (use OEM values where available)
Intermittent faults: voltage spikes, dropouts or floating signals when harness is moved
Communications: some systems report passenger sensor over data bus — valid communication frames expected when system active

Diagnostic algorithm

Retrieve and record B1926 and any related codes; note freeze-frame/live data.
Follow manufacturer SRS disable/lockout procedure before doing any seat or connector work.
Visually inspect the passenger seat, sensor area and connectors for water, damage, contamination or aftermarket covers.
Disconnect the battery per OEM guidance if required; then inspect and reseat the passenger pressure switch connector and SRS module connector.
With SRS procedures observed, check for proper reference voltage and ground at the switch connector using OEM pinouts. Record readings.
Perform continuity/resistance checks between the switch and the SRS module connector for opens/shorts; check for high resistance.
Use a scan tool to monitor the passenger pressure sensor output while applying known weight/pressure to the seat. Confirm the signal changes as expected.
Wiggle the harness and seat while monitoring live data for intermittent changes; isolate any movement-related faults.
If wiring and connectors test good but signal does not respond correctly, replace the passenger pressure/sensor switch assembly and retest.
If replacement switch does not clear the fault, consider SRS control module fault or bus communication error; consult manufacturer diagnostic manual and perform module-level tests.
After repairs, clear codes and verify system operation and that SRS/airbag light is off and passenger detection behaves correctly.

Likely causes

Disconnected or corroded connector at the passenger pressure switch
Damaged wiring harness under the seat (pinched or chafed)
Failed passenger pressure/occupant detection sensor
Contamination or water damage to the switch assembly
Incorrect seating surface or aftermarket seat cover interfering with sensor

Fault status

⚠️ Status

Air Bag Passenger Pressure Switch Circuit Failure — indicates an open/short/high resistance or communication fault in the passenger occupant pressure switch circuit; SRS warning lamp may be illuminated and passenger airbag enable status may be incorrect.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours