STEP 4. Check the harness for open circuit between SRS-ECU connector C-126 and the passenger's (front) air bag module connector C-114.
(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-126 SRS-ECU connector.
(3) danger | To prevent the air bag from deploying unintentionally, disconnect the passenger’s (front) air bag module connector C-114 to short the squib circuit. |
(4) Slide the outer housing of harness side connector in the arrow direction shown, and disconnect the C-114 harness side connector.
(5) caution | Insert an insulator such as a cable tie to a depth of 4 mm (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 7 and 8 <1st squib> or 9 and 10 <2nd squib>, and the short spring to release the short spring.
(6) caution | Do not insert a probe into the terminal from C-114 harness side connector front side directly as the connector contact pressure may be weakened. |
Check for continuity between the following terminals. It should be less than 2 ohms.
<1st squib>
- SRS-ECU connector C-126 (terminal No.7) and the passenger’s (front) air bag module connector C-114 (terminal No.2)
- SRS-ECU connector C-126 (terminal No.8) and the passenger’s (front) air bag module connector C-114 (terminal No.1)
<2nd squib>
- SRS-ECU connector C-126 (terminal No.11) and the passenger’s (front) air bag module connector C-114 (terminal No.4)
- SRS-ECU connector C-126 (terminal No.12) and the passenger’s (front) air bag module connector C-114 (terminal No.3)
Does continuity exist?
Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1411 <1st squib> or B1491 <2nd squib> set, replace the SRS-ECU. (Refer to ). Then go to Step 5. Repair the harness wires between SRS-ECU connector C-126 and passenger’s (front) air bag module connector C-114. Then go to Step 5.