Turn the ignition switch ON (ll). Measure the voltage between the No. 1 terminal of the interlock relay connector and body ground. INTERLOCK RELAY CONNECTOR Wire side of female terminals Is there battery voltage? YES - Go to step 10. NO - Repair open or short in the wire between the No. 1 terminal of the interlock relay connector and the under-dash fuse/relay box. Turn the ignition switch OFF. Check for continuity between the No. 3 terminal of the interlock relay connector and body found. INTERLOCK RELAY CONNECTOR Wire side of female terminals Is there continuity? YES - Go to step 12. NO - Repair open in the wire between the No. 3 terminal of the interlock relay connector and ground (G451), or repair poor ground (G451).

Check for continuity between the No. 5 terminal of the interlock relay connector and the No. 3 terminal of the interlock control unit connector. INTERLOCK CONTROL UNIT CONNECTOR Wire side of female terminals Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the No. 5 terminal of the interlock relay connector and the interlock control unit.