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Test 3C: No Response From Left SIACM

NOTE: Prior to performing any air bag system test, go to PRETEST INSPECTION & DIAGNOSTIC PROCEDURE  under DIAGNOSTICS. Perform air bag verification test after all repairs unless otherwise directed. See TEST VER-1: AIR BAG VERIFICATION TEST  under DIAGNOSTIC TESTS.
  1. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Connect DRB to DLC. Turn ignition switch to ON position. Connect negative battery cable. On DRB, read DTCs. If LOSS OF IGNITION RUN-START is displayed, go to TEST 3A: ACM, LOSS OF IGNITION RUN-START (ACTIVE CODE)  under and diagnose malfunction. If LOSS OF IGNITION RUN-START is not displayed, go to next step.
  2. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access and disconnect left SIACM connector. See SIDE IMPACT AIR BAG CONTROL MODULE (SIACM)  under REMOVAL & INSTALLATION. Measure resistance between ground and left SIACM connector terminal No. 5 (Black-Pink wire). See Figure . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open circuit in Black-Pink wire between left SIACM connector and ground. See WIRING DIAGRAMS  .
  3. Turn ignition switch to ON position. Connect negative battery cable. Measure voltage between ground and left SIACM connector terminal No. 1 (Dark Green-White wire). If voltage is less than 6 volts, repair open circuit in Dark Green-White wire. If voltage is more than 6 volts, go to next step.
    4. NOTE: Ensure there is PCI bus communications with other vehicle control modules. Diagnose and resolve any PCI bus malfunctions before proceeding to next step.
  4. Using Scope Input Cable (CH7058), connect scope input cable to DRB channel one connector. Using Cable-to-Probe Adapter (CH7062) and Red and Black test probes, connect cable-to-probe adapter and Red and Black test probes to scope input cable. On DRB select PEP MODULE TOOLS, LAB SCOPE, LIVE DATA and 12 VOLT SQUARE WAVE. Press F2 for scope and ENTER to select channel. Press F2 and use down arrow to set voltage range to 20 volts. Press F2 when voltage range is set. Connect Black test probe to body ground. Connect Red test probe to left SIACM connector terminal No. 8 (Violet-Yellow wire). If voltage reading on DRB display pulses 0-7.5 volts, replace left SIACM. If voltage reading on DRB display does not pulse 0-7.5 volts, repair open circuit in Violet-Yellow wire.
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