DTC Troubleshooting: 21-8x

DTC 21-8x (21-80 to 21-89, 21-8A to 21-8F): Short to Power in Left Side Seat Belt Tensioner Special Tools Required SRS inflator simulator 07SAZ-TB4011A SRS simulator lead C 07TAZ-SZ5011A Erase the DTC memory. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off. Does the SRS indicator stay on, and is DTC 21-8x indicated?
YES | - | Go to Step 3 .
NO | - | Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC troubleshooting index.
Turn the ignition switch OFF. Disconnect the battery negative cable, and wait for 3 minutes. Disconnect the driver's seat belt tensioner 2P connector (A) from the floor wire harness. Connect the SRS inflator simulator (2 Ω connector) and simulator lead C to the floor wire harness. Reconnect the battery negative cable. Erase the DTC memory. Read the DTC. Is DTC 21-8x indicated?
YES | - | Go to Step 9 .
NO | - | Short to power in the left side seat belt tensioner; replace the left side seat belt. ■
Turn the ignition switch OFF. Disconnect the battery negative cable, and wait for 3 minutes. Disconnect the right side seat belt tensioner connector. Disconnect SRS unit connector B (28P) from the SRS unit. Disconnect the SRS inflator simulator from the SRS simulator lead. Reconnect the battery negative cable. Turn the ignition switch ON (II). |

Check for voltage between the No. 1 terminal of SRS unit connector B (28P) and body ground, and between the No. 2 terminal and body ground. There should be 0.5 V or less. Is the voltage as specified?
YES | - | Faulty SRS unit; replace the SRS unit.■
NO | - | Short to power in the floor wire harness; replace the floor wire harness.■