STEP 4. Check the driver's seat belt pre-tensioner circuit. Measure the voltage at the SRS-ECU connector C-124.
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever, and disconnect the C-124 SRS-ECU connector.
(3) caution | To prevent the seat belt pre-tensioner from deploying unintentionally, disconnect the driver’s seat belt pre-tensioner connector D-28 to short the squib circuit. |
Disconnect driver's seat belt pre-tensioner connector D-28. Use a flat-tipped screwdriver to unlock the locking button at the harness side connector by withdrawing it toward you in two stages, and then disconnect the connector.
(4) caution | Insert an insulator such as a cable tie to a depth of 4mm (0.16 inch) or more, otherwise the short spring will not be released. |
Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] between terminals 54, 55 and the short spring to release the short spring.
(5) Connect the negative battery terminal.
(6) Ignition switch: "ON".
(7) Measure the voltage between C-124 harness side connector terminals 54, 55 and body ground.Voltage should measure 1 volt or less.
Is the measured voltage within the specified range?
Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1606 is stored, replace the SRS-ECU (Refer to ). Then go to Step 6. Go to Step 5.