STEP 4. 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) Disconnect the clock spring connector.
(3) Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991866).
(4) caution | Do not insert a probe directly into the 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 DQ1-, DQ1+ line <B1401>.
Insert the resistor harness probe from the back of harness side connector DQ2-, DQ2+ line <B1481>.
(5) Connect the negative battery terminal.
(6) After erasing the diagnostic trouble code memory, check the diagnostic trouble code again.
(7) Disconnect the negative battery terminal.
(8) caution | Always DTC B1481 is stored when checking DTC B1401. This is because the second side terminal is isolated when checking it. DTC B1481 is stored but this is not a fault. In addition, always DTC B1401 is stored when checking DTC B1481 because the first side terminal is isolated. |
Erase the diagnostic trouble code memory, and check the diagnostic trouble code.
Is the checked DTC stored?
Go to Step 5. Replace the clock spring (Refer to ).