B1318: Suzuki passenger seat occupant sensing fault
B1318 airbag light, passenger seat (Suzuki SX4 and Grand Vitara)
Severity: Inspect soon
The airbag light means the system found a fault, and owner's manuals say to have it checked promptly because the airbags may not work as designed; this code concerns the passenger seat occupant sensing.
B1318 in short
On Suzuki SX4 and Grand Vitara, B1318 lights the airbag warning light because of the front passenger seat sensing: changes in load such as someone shifting, or a bag bouncing on the seat. Suzuki also acknowledged a sensor mat open circuit. The car drives, but the passenger airbag may not work as intended.
Suzuki's bulletins for the 2009 SX4 and Grand Vitara say B1318 is stored with the airbag light on when the load on the passenger seat changes, for example a passenger shifting or an object bouncing on the seat while driving.
One SX4 owner reports a Suzuki letter acknowledging an open-circuit problem with the sensor mat that tells the airbag system whether an adult or child is in the front seat, and a small-stature driver's passenger repeatedly setting the warning.
Because it decides whether the passenger airbag is enabled, it should be handled by a technician. Ask the dealer which correction applies to your VIN.
Pick your make
B1318 is a manufacturer-specific code: its meaning depends on who built the car.
Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.
Most likely causes
Cause 1: Passenger seat load change setting the code
Supported by vehicle data- Why it ranks here
- Both Suzuki bulletins describe B1318 as typically resulting from a change in load on the passenger seat.
- What would change this
- Rises if the light follows passenger movement or objects on the seat. Falls if the code is current with an empty, still seat.
Cause 2: Open circuit in the passenger seat sensor mat
Supported by vehicle data- Why it ranks here
- An SX4 owner quotes a Suzuki letter acknowledging an open-circuit problem with the sensor mat in the front seat.
- What would change this
- Rises if the fault is current with a quiet seat. Falls if a dealer correction for the seat module clears it.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Have a shop with an SRS-capable scan tool read the airbag module and note every stored code, current or history, and whether the fault is current.
Warning:Airbag and seat belt pretensioner circuits can deploy if probed or disconnected incorrectly. Only a trained technician following the service manual should test them.
IfB1318 sets after the passenger shifts or an object moves on the seat
It meansThe load-change cause fits the Suzuki bulletins; the dealer checks for the bulletin correction.
IfThe fault does not return after the shop clears it and checks the connectors
It meansThe fault may have been intermittent. Do not assume it is gone; the airbag light should stay off through several drives.
Symptoms
- Airbag, airbag-off and seat belt lights coming on and going off at various times
- Light appears when a passenger shifts weight or an object bounces on the seat
How to fix
This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.
On your vehicle
SuzukiYour car
2009 · SX4
Supported by vehicle dataSuzuki bulletin TS-01-11029 covers B1318 with the airbag light from passenger seat load changes. Whether it is still current is not verified.
2009 · Grand Vitara
Supported by vehicle dataSuzuki bulletin TSB-05-01140 gives a countermeasure procedure for B1318. Whether it is still current is not verified.
TS-01-11029Status unverified
Airbag warning light with DTC B1318
2009sx4 · NHTSA 10032751
Describes B1318 with the airbag light, typically from a change in load on the passenger seat. The NHTSA summary does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
TSB-05-01140Status unverified
Counter measure procedure for DTC B1318
2009grand-vitara · NHTSA 10032904
Same B1318 condition on the Grand Vitara. The NHTSA summary does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
ASMC-009375Status unverified
Counter measure procedure for DTC B1318
2009sx4 · NHTSA 10049919
Counter measure procedure for B1318 with the airbag light from a passenger seat load change. The NHTSA summary does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
ASMC-009472Status unverified
Airbag warning light with DTC B1318
2009grand-vitara · NHTSA 10049899
Same B1318 condition on the Grand Vitara. The NHTSA summary does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
No curated relationships for B1318 yet.
B1318 questions
Is it safe to drive with B1318 and the airbag light on?
The car usually still drives normally, but manufacturers say the airbags may not work as designed while the light is on. Get it checked soon and do not rely on the airbags until it is.
Sources and review
- 2023 Accord Owner's Manual: Airbag System Indicators
- Camry Owner's Manual (OM06291U)
- Nissan Supplemental Restraint Systems: damage analysis and repair using Diagnostic Trouble Codes (TechNews, Summer 2016)
- Suzuki TS-01-11029: 2009 SX4, airbag warning light with DTC B1318
- Suzuki TSB-05-01140: 2009 Grand Vitara, counter measure procedure for DTC B1318
- NHTSA complaint ODI 10533196 (2009 Suzuki SX4)
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error