Key Interlock Unit Inspection

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Remove the front side trim.

Turn the ignition switch to ON, and inspect terminal voltages, referring to the chart below.

If not as specified, repair the wiring harness and/or key interlock unit.

Fig 1: Identifying Key Interlock Harness Side Connector

Courtesy of MAZDA MOTORS CORP.

TERMINAL REFERENCE

Terminal	(-) terminal connected to	Condition	Correct measurement value (V)
A	G	For less than 2 seconds after ignition switch is turned to ACC or on with P position switch on.	Approx.0
A	G	Except above conditions	B+
C	G	P position switch is on, and ignition switch is turned to ACC or ON.	Approx.0
C	G	Except above condition	B+
G	Ground	Under any condition	Approx.0
K	G	P position switch is on.	Approx.0
K	G	P position switch is off.	B+
0	G	Ignition switch is at ON.	B+
0	G	Ignition switch is off.	Approx.0
P	G	Ignition switch is at ACC.	B+
P	G	Ignition switch is at position other than ACC.	Approx.0

Install the front side trim.