Test W: The High Beam Indicator Is Never/Always On

PINPOINT TEST W: THE HIGH BEAM INDICATOR IS NEVER/ALWAYS ON

Normal Operation
When the high beams are turned on, the smart junction box (SJB) sends a signal to the instrument cluster through the medium speed controller area network (MS-CAN) communication bus to illuminate the high beam indicator. If the high beam status message is missing for more than 5 seconds, the instrument cluster sets DTC U0140 in continuous memory and defaults the high beam indicator off.

NOTE: If DTC U0140 is set in the instrument cluster, other observable symptoms may also be present such as tire pressure monitoring system (TPMS) warning indicator, backlighting and door ajar indication.

This pinpoint test is intended to diagnose the following:
- SJB
- Instrument cluster

W1-W4:

W5: