STEP 5. Resistance measurement at the SRS-ECU and the C-313 clock spring connectors
(1) Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(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 SRS-ECU connector.
(3) caution | To release SRS-ECU connector short spring in the following operations, disconnect this clock spring connector, and keep the squib circuit shorted. |
Disconnect the clock spring connector.
(4) caution | The short spring may not be released due to the insufficient insertion. Therefore, insert the insulator for 4 mm (0.16 inch) or more. |
Insert the insulator [width: 3 mm (0.12 inch), thickness: 0.5 mm (0.02 inch)] such as cable tie between the DQ1-, DQ1+ line, and then release the short spring <B1401>.
Insert the insulator [width: 3 mm (0.12 inch), thickness: 0.5 mm (0.02 inch)] such as cable tie between the DQ2-, DQ2+ line, and then release the short spring <B1481>.
(5) caution | Do not insert a probe directly into the terminal of clock spring connector harness side connector from the connector front side as the connector contact pressure may be weakened. |
Take the measurements below at the SRS-ECU connector and clock spring connector harness side connectors.
- Continuity DQ1- line between SRS-ECU connector and clock spring connector <B1401>
- Continuity DQ1+ line between SRS-ECU connector and clock spring connector <B1401>
OK: Continuity (less than 2 Ω)
- Continuity DQ2- line between SRS-ECU connector and clock spring connector <B1481>
- Continuity DQ2+ line between SRS-ECU connector and clock spring connector <B1481>
OK: Continuity (less than 2 Ω)
Is the check result normal?
Go to Step 6. Repair the wiring harnesses DQ1-, DQ1+ line <B1401> or DQ1-, DQ1+ line <B1481> between the clock spring connector and the SRS-ECU connector.