DTC 21: Driver-Side Air Bag Module Short 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.
- Before proceeding, see AIR BAG SAFETY PRECAUTIONS . If DTC 34 is retrieved, go to next step. If DTC 34 is not retrieved, go to step 3.
- If SRS ECU connector C-115 is connected correctly, go to next step. See Figure. If SRS ECU connector is not corrected properly, install connector correctly. Go to step 8.
- Disconnect negative battery cable. Disconnect, then reconnect SRS ECU connector C-115, lower clockspring connector C-307 and driver-side air bag module connector C-306. Connect negative battery cable. Using scan tool erase, then retrieve DTC's. If DTC 21 is retrieved, go to next step. If DTC 21 is not retrieved, system is normal at this time.
- Disconnect negative battery cable. Connect Resistor Harness (MB991866) to terminals of upper clockspring connector C-306 by backprobing connector. See Fig 1. Connect Load Resistor (MB991865) to resistor harness. Connect negative battery cable. Using scan tool erase, then retrieve DTC's. If DTC 21 is retrieved, go to next step. If DTC 21 is not retrieved, replace driver-side air bag module. See DRIVER-SIDE AIR BAG MODULE & CLOCKSPRING under REMOVAL & INSTALLATION. Go to step 8.
- Disconnect negative battery cable. Connect resistor harness and load resistor to terminals No. 3 and 4 of clockspring connector C-307 by backprobing connector. See Fig 2. Connect negative battery cable. Using scan tool erase, then retrieve DTC's. If DTC 21 is retrieved, go to next step. If DTC 21 is not retrieved, replace clockspring. See DRIVER-SIDE AIR BAG MODULE & CLOCKSPRING under REMOVAL & INSTALLATION. Go to step 8.
- Disconnect SRS ECU connector C-115 and clockspring connector C-307. Insert a cable tie or similar insulator between terminals No. 11 (Yellow/Black wire) and 12 (Yellow wire) of SRS ECU connector to release shorting bar. See Figure. Check for continuity between terminals No. 11 and 12. If continuity exists, go to next step. If continuity does not exist, erase, then retrieve DTC's using scan tool. If DTC 21 is retrieved, replace SRS ECU. See SRS ELECTRONIC CONTROL UNIT (SRS ECU) under REMOVAL & INSTALLATION. Go to step 8.
- Check wire harness between SRS ECU connector C-115 and lower clockspring connector C-307 for a short circuit. See WIRING DIAGRAMS . If wire harness is okay, go to next step. If wire harness has a short circuit, replace wire harness. Go to next step
- Reconnect all SRS components. Activate air bag system. Using scan tool retrieve DTC's. If DTC 21 is retrieved, go to step 1. If DTC 21, is not retrieved, system is normal at this time. Intermittent condition may exist.