Pinpoint Test Y: The High Beam Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test Y: The High Beam Indicator Is Never/Always On

Normal Operation

When the multifunction switch is in the high beam position, a message is sent to the Instrument Panel Cluster (IPC) from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus. Upon receipt of the high beam on message, the IPC (Instrument Panel Cluster) illuminates the high beam indicator.

If the high beam status message is missing from the SJB (Smart Junction Box) for less than 5 seconds, the IPC (Instrument Panel Cluster) defaults the high beam indicator to the last on/off state, based upon the last known good high beam status message received.

If the high beam status message is missing for more than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0140:87 and defaults the high beam indicator off.

This pinpoint test is intended to diagnose the following:

- High beam concern

- SJB (Smart Junction Box)

- IPC (Instrument Panel Cluster)

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

Y1 DETERMINE THE FAULT CONDITION

- Place the headlamps in the HIGH BEAM position.

- Ignition ON.

- Observe the high beam indicator.

Does the high beam indicator illuminate?

Yes
GO to Y4.

No
LEAVE the headlamps in the HIGH BEAM position. GO to Y2.

Y2 CHECK THE HIGH BEAM HEADLAMPS OPERATION

- Observe the high beam headlamps.

Do the high beam headlamps operate correctly?

Yes
GO to Y3.

No
REFER to Lighting and Horns.

Y3 CARRY OUT THE IPC (Instrument Panel Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Turn off the headlamps.

- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.

- Select the IPC (Instrument Panel Cluster) high beam indicator (HIGH_BEAM). Command the high beam indicator on and off while observing the high beam indicator.

Does the high beam indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to Y4.

No
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

Y4 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded DTCs from the IPC (Instrument Panel Cluster) self-test.

Are any DTCs recorded?

Yes
For DTC U0140:87, GO to Pinpoint Test AT Pinpoint Test AT: DTC U0140:87.

For all other DTCs, REFER to DTC Charts Instrumentation, Message Center and Warning Chimes.

No
INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.