B0786

Code

Generic B — Body

Passenger frontal airbag squib circuit high resistance

Brand: Generic

Type: B — Body

Views: UK: 18 EN: 19 RU: 12

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Corroded or contaminated airbag connector
Damaged, bent or broken wiring / pin at harness or connector
Poor/crushed wire or poor crimp at splice or terminal
Faulty passenger frontal airbag squib (inflator module)
High resistance in connector terminals or harness due to water ingress
Poor ground or shared ground issue affecting circuit measurement

Symptoms

SRS / airbag warning lamp illuminated on dash
Passenger airbag disabled or unavailable (message on dash on some vehicles)
Possible intermittent SRS lamp (comes on then off) depending on ignition cycles or vibration
Vehicle may fail inspection with SRS lamp on

What to check

Read all SRS codes and freeze frame with a capable scan tool; record and clear then re-check
Visually inspect passenger airbag connector and harness routing for damage, contamination or water
Check connector pins for corrosion, bent pins, or pushed-out terminals
Measure squib circuit resistance with DMM (see signal parameters) following SRS safety procedures
Perform wiggle test on harness/connectors while monitoring resistance or live data (monitor SRS status with scan tool)
Inspect for aftermarket modifications or prior repairs in the passenger area

Signal parameters

Typical passenger airbag squib resistance (measured across the squib connector): usually low ohms — commonly in the range 0.5–5 Ω depending on manufacturer (consult factory spec)
Open circuit / very high resistance: tens of kilohms or OL on DMM
Connector/circuit high-resistance indication: measured resistance noticeably above manufacturer spec (example: >5–10 Ω depending on spec)
Voltage at squib circuit with ignition ON (no crash): near battery voltage on the sensing circuit but do not attempt to apply power to the squib
No continuity indicates open or broken conductor; slightly elevated resistance indicates poor connection/corrosion

Diagnostic algorithm

Safety first: Disable SRS power per manufacturer procedure (disconnect battery and wait prescribed time or follow service manual) before inspecting or disconnecting airbag connectors.
Use a scan tool to record codes and live data; confirm code B0786 and check for any related occupant classification, passenger detection or other SRS codes.
Visually inspect the passenger airbag connector (usually behind glove box or on passenger kick panel) and wiring harness for damage, corrosion, moisture, or disconnected terminals.
With SRS power disabled and service manual guidance, disconnect the passenger airbag connector and inspect pins/terminals. Repair or replace connector/terminals if damaged.
Measure resistance across the squib at the connector harness end (or at the airbag module per manual). Compare to manufacturer spec. A reading much higher than spec or OL indicates high resistance/open.
If resistance is high at the module connector, open and inspect wiring along the harness route (look for chafing, splice issues, or water intrusion). Repair wiring and terminals as found.
If harness wiring checks good, reconnect and measure resistance at the SRS control module connector to isolate whether the fault is near the module or the airbag.
If measurements point to the airbag inflator/squib (resistance abnormal only at the module side), consider replacing the passenger airbag module. Follow disposal and replacement procedures for pyrotechnic devices.
If wiring and airbag appear good and high resistance persists, consider SRS control module internal driver fault; consult manufacturer procedure for module bench testing or replacement.
After repairs, reconnect, restore SRS power per procedure, clear codes with scan tool and perform system checks. Verify SRS lamp extinguishes and that code does not return after cycling ignition and a test drive if applicable.

Likely causes

Corrosion or bent pins at the passenger airbag connector (under dash/passenger side)
Wiring abrasion or pinched harness near door, dash, or seat area
Aftermarket work (audio, alarms, seats) that disturbed the squib connector or spliced the wire
Loose or partially seated connector at airbag module or SRS control unit
Damaged squib inside the passenger airbag module from prior impact or water exposure

Fault status

⚠️ Status

SRS control module reports high resistance in the passenger frontal airbag squib circuit — indicates poor connection, damaged wiring, or a faulty squib causing the airbag circuit to exceed expected resistance.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours