STEP 3. Diagnosis check by dummy resistor connection.
(1) Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2) Use the flat-tipped screwdriver to pull out the locking button of wiring harness side connector, and release the lock, connect the connector again.
(3) Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884).
(4) caution | Do not insert a probe directly into the passenger's (front) air bag module terminal from the connector front side as the connector contact pressure may be weakened. |
Insert the resistor harness probe from the back of harness side connector ASQ+, ASQ- line <B1411>.
Insert the resistor harness probe from the back of harness side connector AQ2+, AQ2- line <B1491>.
(5) Connect the negative battery terminal.
(6) caution | Always DTC B1491 is set when checking DTC B1411. This is because the second side terminal is isolated when checking it. DTC B1491 is set but this is not a fault. In addition, always DTC B1411 is set when checking DTC B1491 because the first side terminal is isolated. |
Erase the DTC memory, and check the diagnostic trouble code.
(7) Disconnect the negative battery terminal.
Is the checked DTC set?
Go to Step 4. Replace the passenger's (front) air bag module (Refer to ).