Key Technical Specifications
| Parameter | Detail |
|---|---|
| Manufacturer | Autoliv Inc. (Sweden) |
| Model | Gtw.Mod. B0110 |
| Part Number | 627697900B |
| Module Type | Gateway module for SRS (Supplemental Restraint System) networks |
| Primary Function | CAN-to-LIN protocol translation for restraint system sensors |
| Communication Protocols | CAN bus, LIN bus |
| Connected Devices | Occupant classification sensors (seat mats), seatbelt buckle/pretensioner interfaces, side-impact satellite sensors, steering wheel switches |
| Data Flow | LIN-based satellite sensors → Gateway module → CAN bus → ACU (Airbag Control Unit) |
| Application Platforms | Passenger vehicles and light commercial vehicles with distributed SRS architecture |
| Installation Context | OEM assembly lines, authorized service centers, fleet maintenance |
| Quality Documentation | Traceable by part number and lot; supports OEM-level quality documentation |
| Warranty | 365 days (replacement or repair as applicable) |
Product Introduction
If you’ve ever chased a phantom SRS fault code that kept coming back after clearing, the culprit was often a gateway module that couldn’t keep up with the LIN bus traffic from a failing occupant sensor. The Autoliv Gtw.Mod. B0110 (627697900B) sits at the junction between the vehicle’s high-speed CAN backbone and the slower LIN sub-networks that serve distributed restraint sensors — seat mats, buckle switches, side-impact satellites. Its job is to aggregate, validate, and forward those sensor messages to the ACU with the right timing and priority. When it works, you never think about it. When it fails, the airbag warning light stays on and the system may disable certain restraints entirely.This module is designed for platforms where the SRS architecture is split across a central ACU and multiple satellite or seat modules. Instead of running individual CAN lines to every sensor (which would be prohibitively expensive in wiring), Autoliv uses LIN branches that terminate at this gateway. The gateway then speaks CAN to the ACU. One thing to watch: the software revision baked into the module must match the vehicle’s calibration. A mismatched revision will throw DTCs even if the hardware is physically identical. Always verify the VIN before ordering.
Quality SOP & Tech Pitfalls
The Lab Report (SOP):
- Visual / counterfeit inspection — Verify Autoliv branding, part number (627697900B), model marking (B0110), and lot traceability code. Check the connector housing for cracked pins or corrosion.
- Connector pinout verification — Cross-reference the connector pinout against the OEM wiring diagram for the target vehicle platform. Confirm CAN_H, CAN_L, LIN, and power/ground pins match.
- Bench test on CAN/LIN simulator — Connect to a CAN/LIN bus simulator. Verify the module responds to LIN header frames from simulated satellite sensors and forwards correctly formatted CAN messages.
- Protocol translation validation — Monitor CAN bus traffic with a diagnostic tool (e.g., Vector CANoe, Autel, or OEM scanner). Confirm LIN sensor data appears on the CAN bus with correct message IDs and signal values.
- DTC scan — Connect an OBD-II scanner and verify no stored or pending DTCs related to the gateway module or connected LIN nodes.
- Power cycling test — Apply vehicle battery voltage, verify module boot sequence, and confirm stable CAN/LIN communication after 10 power cycles.
- Anti-static sealing — Bagged in ESD packaging with connector protection caps.
The Engineer’s Warning (Pitfalls):
- VIN mismatch is the #1 cause of comebacks. I’ve seen technicians install a physically identical 627697900B from a donor vehicle, only to have the SRS light come back on because the software revision didn’t match the target vehicle’s calibration. Always verify the VIN and software revision before installation. Some platforms require post-installation coding via the OEM diagnostic tool.
- Don’t ignore LIN bus termination. If the gateway module is replaced but a LIN branch has a short, open, or faulty satellite sensor, the gateway will keep reporting communication faults. Always scan all LIN nodes on the branch after installing the gateway. A single bad seat mat sensor can take down the entire LIN branch and make the gateway look like the problem.
Installation & Configuration Guide
30-Minute Swap Procedure:
- Pre-Installation ⚠️
- Disconnect the vehicle battery negative terminal and wait at least 10 minutes for the SRS backup capacitor to discharge. This is critical — accidental airbag deployment can cause serious injury.
- Photograph the existing module’s connector orientation, mounting position, and any labels. Note the software revision if visible on the label.
- Verify the replacement module’s part number (627697900B) and model (B0110) match the original.
- Removal
- Locate the gateway module — typically mounted under the driver’s seat, in the center console, or near the ACU depending on the vehicle platform.
- Disconnect the electrical connector(s). Do not pull on the wires — release the connector locking tab first.
- Unbolt or unclip the module from its mounting bracket.
- Installation
- Verify the new module’s part number and software revision match the vehicle VIN. If the revision differs, check with the OEM service documentation whether coding is required.
- Mount the module in the original position. Torque mounting bolts to OEM spec (typically 5–8 N·m for plastic bracket mounts).
- Reconnect the electrical connector(s). Ensure the locking tab clicks into place.
- Reconnect the vehicle battery negative terminal.
- Power-On & Testing
- Turn the ignition to ON (do not start the engine). Wait 30 seconds for the SRS system to self-check.
- Connect an OBD-II scanner and check for SRS-related DTCs. Clear any stored codes.
- Verify the airbag warning light illuminates briefly during startup and then extinguishes. If it stays on or flashes, there is an active fault.
- If the platform requires post-installation coding, use the OEM diagnostic tool to code the gateway module to the vehicle VIN.
- Perform a functional test: verify occupant classification sensor readings, buckle status, and any side-impact sensor data are visible in the diagnostic tool’s live data stream.
Compatible Replacement Models
| Compatibility Tier | Model / Part Number | Notes |
|---|---|---|
| ✅ Drop-in Replacement | Autoliv Gtw.Mod. B0110 627697900B | Exact match. Same hardware and software revision. Verify VIN compatibility before ordering. |
| ⚠️ Software Dependent | Autoliv Gtw.Mod. B0110 (different suffix, e.g., 627697900A/C) | Same hardware platform but different software revision. May require OEM coding to match the vehicle VIN. Estimate 30–60 minutes for diagnostic tool coding. |
| ⚠️ Platform Specific | Autoliv Gtw.Mod. B0111 627697901B | Different model variant for a different vehicle platform. Not directly interchangeable without verifying pinout and software compatibility. |
| ❌ Not Compatible | Autoliv Sim.Mod. B0760 627913600B | This is a simulator/regulator module used for testing, not a vehicle-installed gateway module. Different function entirely. |
Frequently Asked Questions (FAQ)
Can I use a 627697900B from a different vehicle model?
Not recommended. Even if the connector fits, the software revision and LIN node configuration may differ. A mismatch can cause DTCs, communication faults, or incorrect restraint system behavior. Always verify VIN compatibility.Does this module need to be coded after installation?
Depends on the vehicle platform. Some platforms accept a direct swap with no coding required. Others require the OEM diagnostic tool to code the module to the vehicle VIN. Check the OEM service documentation for your specific vehicle.What happens if the gateway module fails?
The ACU will lose communication with the LIN-based satellite sensors (seat mats, buckle switches, side-impact sensors). This typically triggers an SRS fault code and illuminates the airbag warning light. In many cases, the system will disable certain restraints (e.g., passenger airbag) as a safety precaution.How do I know if the problem is the gateway module vs. a LIN sensor?
Use a diagnostic tool to scan the LIN bus. If the gateway module reports “LIN communication fault” for a specific node, the problem is likely the sensor or wiring on that branch, not the gateway itself. If the gateway itself is not responding on the CAN bus, the module is likely faulty.Is this module the same as the ACU (Airbag Control Unit)?
No. The ACU is the central decision-maker that commands airbag deployment and pretensioner firing. The gateway module (Gtw.Mod. B0110) is a communication bridge that feeds sensor data to the ACU. They are separate components with different part numbers and functions.What’s the difference between Gtw.Mod. B0110 and Gtw.Mod. B0111?
The B0111 is a different model variant, typically used on a different vehicle platform. The part number suffix (627697900B vs. 627697901B, etc.) indicates different hardware or software configurations. Do not substitute one for the other without verifying pinout and software compatibility.
