F4 Check Input Power to Ignition Switch

- Disconnect connector from ignition switch.

Connector:

- Connect voltmeter between pin B5, circuit 1050 (LG/PK) and a known good ground.

- Is battery voltage present?

YES -- Go to F5. F5 Check Circuit 16 (R/LG) For Short to Ground

NO -- Inspect and replace power distribution box fuse 3 (40A) as required. Service circuit 1050 (LG/PK) for open or short circuit. Restore vehicle. Retest system.