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Home >> Mazda >> 2004 >> RX-8 1.3 3 >> Repair and Diagnosis >> External Pages >> Different car >> Section 119 (Air Bag System) >> Diagnostic Tests >> Test F: Left Seat Belt PRETENSIONER Circuit Resistance High Or Low, Short To Power Or Short To Ground >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Left seat belt pretensioner malfunction can be caused by open or short circuit in wiring harness between left seat belt pretensioner and SAS control module, left seat belt pretensioner malfunction or SAS control module malfunction.

  1. Inspect left seat belt pretensioner

    Using scan tool, inspect resistance for PID/DATA monitor DR-PTENS. See PID/DATA MONITOR & RECORD  under DIAGNOSTICS. If resistance is 1.5-3.1 ohms and performing present malfunction diagnosis, replace SAS control module. See SAS CONTROL MODULE  under REMOVAL & INSTALLATION. If resistance is 1.5-3.1 ohms and performing past malfunction diagnosis, test is complete. If resistance is not 1.5-3.1 ohms, go to next step.

  2. Inspect left seat belt pretensioner connector

    Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least one minute. Access left seat belt pretensioner connector. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. Disconnect and inspect left seat belt pretensioner connector. If left seat belt pretensioner connector is damaged, replace air bag system wiring harness. If left seat belt pretensioner connector is not damaged, go to next step.

  3. Isolate malfunction

    Connect leads of 2 ohm resistor across terminals of left seat belt pretensioner 2-pin connector. Connect negative battery cable. Turn ignition switch to ON position. Retrieve Diagnostic Trouble Codes (DTCs). See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTCs B1877, B1878, B1879 and/or B1885 are retrieved, replace air bag system wiring harness and go to next step. If DTCs B1877, B1878, B1879 and/or B1885 are not retrieved, replace right seat belt pretensioner.

  4. Inspect SAS control module

    Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least one minute. Connect left seat belt pretensioner connector. Connect negative battery cable. Retrieve DTCs. If DTCs B1877, B1878, B1879 and/or B1885 are retrieved, replace SAS control module. If DTCs B1877, B1878, B1879 and/or B1885 are not retrieved, test is complete.
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