Connector Measurement Service Points
CONNECTOR MEASUREMENT SERVICE POINTSTurn the ignition switch to the LOCK (OFF) position when connecting and disconnecting the connectors. Turn the ignition switch to ON when measuring, unless there are instructions to the contrary.
IF INSPECTING WITH THE CONNECTOR CONNECTED WATERPROOF CONNECTORS
Be sure to use special tool. Never insert a test probe from the harness side, as this will reduce the waterproof performance and result in corrosion.
IF INSPECTING WITH THE CONNECTOR CONNECTED ORDINARY (NON-WATERPROOF) CONNECTORS
Check by inserting the multi-meter test probe from the harness side. Note that if the connector (control unit, etc.) is too small to permit insertion of the test probe, it should not be forced; use the backprobing tool for this purpose.
IF INSPECTING WITH THE CONNECTOR DISCONNECTED
Required Special Tool:
^ MB991219: Inspection Harness (Included in MB991223, Harness Set)
^ The special tool MB991219 for connector pin contact pressure should be used. The test probe should never be forcibly inserted, as it may cause a defective contact.
^ From back side of the connector (SRS-ECU harness side connector)
^ Since the SRS-ECU harness connector is plated to improve conductivity, observe the warning below when checking this connector.
WARNING: Insert the backprobing tool into the connector from the harness side, and connect the tester to the back probing tool. If any tool other than the backprobing tool is used, it may cause damage to the harness and other components. Furthermore, measurement should not be carried out by touching the backprobing tool directly against the terminals from the front of the connector. The terminals are plated to increase their conductivity, so that if they are touched directly by the backprobing tool, the plating may break, which will decrease reliability.
IF INSPECTING WITH THE CONNECTOR DISCONNECTED
CAUTION: At this time, be careful not to short the connector pins with the test probes. Doing so may damage the circuits inside the ECU.
Touch the pin directly with the test probe.
CONNECTOR INSPECTION SERVICE POINTS
VISUAL INSPECTION
^ Connector is disconnected or improperly connected
^ Connector pins are pulled out
^ Stretched an broken wires at terminal section
^ Low contact pressure between male and female terminals
^ Low connection pressure due to rusted terminals or foreign matter lodged in terminals
CONNECTOR PIN INSPECTION
If the connector pin stopper is damaged, the terminal connections (male and female pins) will not be perfect even when the connector body is connected, because the pins may pull out of the back side of the connector. Therefore, gently pull the wires one by one to make sure that no pins pull out of the connector.
CONNECTOR ENGAGEMENT INSPECTION
Required Special Tool:
^ MB991219: Inspection Harness (contained in MB991223 Test Harness)
Use special tool MB991219 to inspect the engagement of the male pins and female pins. [Pin drawing force: 1 N (0.2 pound) or more]