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Test 2C: No Response From Orc

WARNING: This page is about a different variant/trim than selected.
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. Access and disconnect Occupant Restraint Controller (ORC) connector. See OCCUPANT RESTRAINT CONTROLLER (ORC)  under REMOVAL & INSTALLATION. Turn ignition switch to ON position. Connect negative battery cable. Using 12-volt test light connected to ground, probe fused ignition switch output circuits at ORC connector terminals No. 14. (Light Green/Yellow wire) and No. 15 (Dark Blue/Yellow). See Figure. If test light illuminates at both terminals, go to next step. If test light does not illuminate at both terminals, repair open circuit or blown fuse in fused ignition switch output circuits (Light Green/Yellow and Dark Blue/Yellow wires) between ORC connector terminal No. 14 and fuse No. 17 and/or terminal No. 15 and fuse No. 16. See WIRING DIAGRAMS . See Figure.
  2. Turn ignition switch to OFF position. Disconnect negative battery cable and wait at least 2 minutes. Connect 12-volt test light to positive terminal of battery or other power source. Probe ORC connector terminal No. 16 (Black wire). If test light illuminates, go to next step. If test light does not illuminate, repair open circuit in black wire between ORC connector and ground.
    3. NOTE: Ensure there is PCI bus communications with other vehicle control modules. Diagnose and resolve any PCI bus malfunctions before proceeding to next step.
  3. Turn ignition switch to ON position. Connect negative battery cable. Using Scope Input Cable (CH7058), connect scope input cable to DRBIII 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 DRBIII 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 ORC connector terminal No. 21 (Violet wire). If voltage reading on DRBIII display pulses from 0-7.5 volts, replace ORC. If voltage reading on DRBIII display does not pulse from 0-7.5 volts, go to next step.
  4. Turn ignition switch to OFF position. Disconnect negative battery cable and wait at least 2 minutes. Access Body Control Module (BCM) and disconnect 26-pin connector. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. Measure resistance between ORC connector terminal No. 21 and BCM 26-pin connector terminal No. 17 (Violet or Violet/Yellow wire). See Figure & Fig 1 . If resistance is less than 5 ohms, replace BCM. If resistance is more than 5 ohms, repair open circuit in Violet or Violet/Yellow wire between ORC connector and BCM 26-pin connector.
Fig 1: Identifying Body Control Module (BCM) Connector Terminals
G99B23672Courtesy of DAIMLERCHRYSLER CORP.
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