Tests AB: DTC U0100 - Lost Communication With ECM/PCM

PINPOINT TEST AB: DTC U0100 - LOST COMMUNICATION WITH ECM/PCM

Normal Operation
The headlamp control module (HCM) receives vehicle speed information from the PCM. If the HCM does not receive communication from the PCM, DTC U0100 is set.

This pinpoint test is intended to diagnose the following:
- HCM
- PCM

AB1-AB4: