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Connector Measurement Service Points

Turn the ignition switch to "OFF" when connecting and disconnecting the connectors. Turn the ignition switch to "ON" when measuring if there are no instructions to the contrary.

IF INSPECTING WITH THE CONNECTOR CONNECTED (WITH CIRCUIT IN A CONDITION OF CONTINUITY)

Required Special Tool:
MD998459: Test Harness




Waterproof Connectors
Be sure to use special tool, MB991219. Never insert a test probe from the harness side, as this so will reduce the waterproof performance and result in corrosion.




Ordinary (non-waterproof) Connectors
Check by inserting the 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


- From front side of the connector

Required Special Tool:
MB991219: Inspection Harness (Included in MB991223, Harness Set)




The inspection harness 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 connector from harness side, and connect the tester to the backprobing 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.






CAUTION: At this time, be careful not to short the connector pins with the test probes. To do so may damage the circuits inside the ECU.

Touch the pin directly with the test bar.
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