Using Diagnosis Check Wire

WARNING: This page is about a different car, the 2002 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

For past codes, go to next step. For present codes, turn ignition switch to ACC or ON position. Wait about 20 seconds. Using Diagnosis Check Wire (09843-18020), connect terminals Tc and E1 of Data Link Connector 1 (DLC1). See Figure. DLC1 is located in right rear corner of engine compartment. Go to step 3.
For past codes, connect Diagnosis Check Wire (09843-18020) between terminals Tc and E1 of Data Link Connector 1 (DLC1). See Figure. DLC1 is located in right rear corner of engine compartment. Go to next step.
If AIR BAG warning light flashes 2 times per second, system is normal (normal code). If AIR BAG warning light does not flash Diagnostic Trouble Codes (DTCs) or flashes DTCs without DLC1 connection, DTCS NOT DISPLAYED or DTCS CONTINUOUSLY DISPLAYED under DIAGNOSTIC TESTS. If AIR BAG warning light is on continuously and DTC is normal (flashes 2 times per second), source voltage is low. Go to SOURCE VOLTAGE DROP under DIAGNOSTIC TESTS.
If AIR BAG warning light flashes, count number of flashes to determine DTCs that are set. For example, DTC 12 is: FLASH, 1.5-second pause, FLASH, FLASH. If more than one DTC is displayed, a 2.5-second pause will occur between each DTC. Lowest numbered DTC will be displayed first, followed by next higher number DTC until all DTCs have been displayed.
After all DTCs are displayed, a 4-second pause will occur, and DTC display will be repeated. See appropriate DTC under DIAGNOSTIC TESTS . After repairing, clear DTCs. See CLEARING CODES .
NOTE: If DTCs other than those listed under DIAGNOSTIC TESTS are displayed, replace the air bag sensor assembly. If the AIR BAG warning light does not function as described, proceed to appropriate test under DIAGNOSTIC TESTS .