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Autopapyrus · Toyota Mark X (X130)
https://autopapyrus.com/guides/toyota/mark-x/connecting-srs-airbag-connectors/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Toyota Mark X (X130): Connecting SRS Airbag Connectors

The SRS on the X130 includes driver and passenger front airbags, side airbags, curtain airbags and seatbelt pretensioners. All of them connect through yellow connectors with double locking. Connect them with the battery disconnected, follow the correct inspection order, and always read the fault codes after reassembly. Wiring routing diagrams for this specific model are not documented in open sources, so the general Toyota principle is described below.

Difficulty: Medium Time: 1-2 hours Steps: 11 Tools: Battery terminal wrench (10 mm), sockets and Torx bits as needed for disassembly, diagnostic scan tool with Toyota SRS support (Techstream or compatible), insulated screwdriver or plastic pry tool for the secondary locks.

Part

  • 🔩 No consumables are needed if the connectors are intact. If a connector or wiring harness is damaged, you need a repair connector or harness of the same configuration. Airbags, curtain airbags and seatbelt pretensioners that have already deployed must be replaced and can never be reused

Step by step

11 steps
  1. Turn the ignition off, disconnect the negative battery terminal and wait at least 3 minutes. Toyota's official minimum is 90 seconds, but a longer wait is safer. During this time the capacitors in the SRS control module discharge. Never work on the yellow connectors while the battery is connected.
  2. Do not insert a resistor, test lamp or tester probe into the SRS connectors, and do not check them with a multimeter. Airbag circuits are sensitive to current. Hold an airbag with the cover facing away from you and your body. Never drop it or lay it face down on the floor.
  3. Inspect every connector before connecting it. The terminals must not be bent, burned or corroded. The shorting clips inside the airbag connectors must be in place. Replace a damaged connector or harness. Never solder or splice SRS wires.
  4. Locate the connectors. The driver airbag connects to the clock spring (spiral cable) in the steering column. The passenger airbag connector is in the dashboard area. The side airbags are in the backs of the front seats, and the curtain airbags are under the pillar and headliner trim, with harnesses running along the pillars to the SRS control module. The SRS module is on the transmission tunnel under the center console.
  5. Connect each connector without force, until it clicks. If it will not seat, check the keying and the position of the secondary lock. Do not force it.
  6. Then push the yellow secondary lock (connector lock) all the way in so that it secures the connector. Pull on the connector by hand. It must not come apart.
  7. Route the harnesses as original, through the clips, without tension or pinching. Make sure the harness under the seat cannot be caught by the seat rails and that the clock spring in the steering column is not chafed. Then reinstall the trim.
  8. If the seats, pillars or steering column were removed, check that the clock spring is centered and that the front wheels are pointing straight ahead. Incorrect centering can tear the cable ribbon.
  9. Reconnect the negative battery terminal. Close the doors and make sure nobody is inside the vehicle. Then turn the ignition on. The SRS warning light should come on for about 6 seconds and then go out. If it stays on, flashes, or does not come on at all, there is a fault.
  10. Read the codes with an SRS-capable scan tool and clear them. If the codes return after clearing, find the cause (most often a loose connector, an unclosed secondary lock, an incorrectly connected airbag or a damaged harness). Disconnect the battery again, wait, and check the circuit.
  11. If the passenger seat has an occupant detection sensor (depends on the market), its connector is separate. After work on the seat it also needs to be checked and may need calibration with special equipment.

Common mistakes and warnings

  • Working with airbags is dangerous: accidental deployment can cause injury. If you have no experience, leave the job to a repair shop. A vehicle with the SRS light on must not be considered safe, because the airbags may not deploy in a crash. Codes that will not clear and the coding of new modules require dealer equipment.