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DTC 42: IG1 Power Circuit

WARNING: This page is about a different car, the 2003 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Inspect fuse No. 3 in driver-side junction block, located on left side of instrument panel. If fuse is okay, go to next step. If fuse is not okay, go to step  4.
  2. Disconnect SRS ECU connector C-115. See Figure. Connect negative battery cable. Turn ignition on. Measure voltage between ground and SRS ECU connector C-115, terminal No. 13 (Black/White wire). See Figure. If voltage is less than 9 volts, go to next step. If voltage is 9 volts or more, erase DTC's using scan tool, then check for DTC's. If DTC 42 is retrieved, replace SRS ECU. See SRS ELECTRONIC CONTROL UNIT (SRS ECU)  under REMOVAL & INSTALLATION. Go to step  8.
  3. Check wire harness between SRS ECU connector C-115 and ignition switch connector C-303, terminal No. 2, including connectors C-203 and C-205. See WIRING DIAGRAMS . See Figure. If wire harness and connectors are damaged, replace wire harness. Go to step  8. If wire harness and connectors are okay, go to step  8.
  4. Replace fuse. Turn ignition on for at least one minute, then off. Inspect fuse. If fuse is okay, go to step  8. If fuse is not okay, go to next step.
  5. Disconnect connector C-205 from junction block. Check for continuity between ground and terminal No. 7 (Yellow/Black wire) of connector C-205. If continuity does exist, check all circuits associated with fuse No. 3 for a short to ground. If continuity does not exist, go to next step.
  6. Disconnect SRS ECU connector C-115. Check for continuity between SRS ECU connector C-115, terminal No. 13 (Black/White wire) and ground. If continuity exists, go to next step. If continuity does not exist, erase, then retrieve DTC's using scan tool. If DTC 42 is retrieved, replace SRS ECU. See SRS ELECTRONIC CONTROL UNIT (SRS ECU)  under REMOVAL & INSTALLATION. Go to step  8.
  7. Check Black/White wire between SRS ECU connector C-115, terminal No. 13 and junction block connector C-205, terminal No. 7 for an open, short or damage. If wire is okay, go to next step. If wire is not okay, replace wire harness and go to next step.
  8. Reconnect all SRS components. Activate air bag system. Using scan tool retrieve DTC's. If DTC 42 is retrieved, go to step  1. If DTC 42 is not retrieved, system is normal at this time. Intermittent condition may exist.
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