Key Interlock System Circuit Troubleshooting

Key Interlock System Circuit Troubleshooting
SRS components are located in this area. Review the SRS components precautions and procedure in the SRS section before you troubleshoot.
1. Turn the ignition switch to ACC (I). The shift lever must be in the [P] position.
2. Disconnect the steering lock assembly connector.
3. Check if the ignition key can be moved to LOCK (0) position, and remove the key from the cylinder.
Is the ignition key able to move to the LOCK (0) position, and then removed?
YES - Go to step 4.
NO - Replace the ignition key cylinder/steering lock assembly.
4. Turn the ignition switch to ACC (I) or ON (II), and shift to the [N] position.





5. Check for the voltage between the No. 4 terminal of the steering lock assembly connector and body ground.
Is there battery voltage?
YES - Go to step 6.
NO - Check for an open in WHT/RED wire between the multiplex integrated control unit and the steering lock assembly connector. If the wire is OK, substitute a known-good multiplex integrated control unit and recheck.
6. Turn the ignition switch to ACC (I), and shift to the [P] position.
7. Remove the center console cover.
8. Disconnect transmission gear selection switch/park pin switch connector.





9. Check for continuity between transmission gear selection switch/park pin switch connector terminals No. 1 and No. 4 when shift lever in the [P] position, and when shift lever shift out of the [P].
Is there continuity when shift lever in any position other than [P], and no continuity when shift lever in [P]?
YES - Check for an open in the wire between the multiplex integrated control unit and the park pin switch connector. If the wire is OK, replace the multiplex integrated control unit.
NO - Replace the park pin switch.