KM63 - Check A/C ON Circuit For Short to Ground

- Key "OFF".

- A/C relay disconnected.

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Measure resistance between test pin 54 at the breakout box and chassis ground.

- Is resistance greater than 10,000 ohms?

Yes -- Go to KM64. KM64 - Check A/C ON Circuit Continuity

No -- Service short to ground. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)