Inspection Method for Switch Connectors or Wires

Connect WDS or equivalent to DLC-2.
Turn ignition key to ON (Engine OFF).
NOTE:
- If engine starts and runs, perform the following steps at idle.
Access PIDs for the switch you are inspecting.
Turn switch on manually.
Shake each connector or wire harness a bit vertically and horizontally while monitoring the PID.
- If PID value is unstable, check for poor connection.
Fig 1: Inspecting Wiring Harnesses
Courtesy of MAZDA MOTORS CORP.