Pinpoint Test X: The LH/RH Turn Or High Beam Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test X: The LH/RH Turn Or High Beam Indicator Is Never/Always On

Normal Operation

When the multifunction switch is in the LH or RH TURN position or if the high beams are on, a message is sent to the Instrument Panel Cluster (IPC) from the Body Control Module (BCM) over the Medium Speed Controller Area Network (MS-CAN) communication bus. The IPC (Instrument Panel Cluster), upon receipt of the LH/RH turn or high beam on message, flashes the LH or RH turn signal indicator on and off or illuminates the high beam indicator.

If the LH/RH TURN or high beam status is missing or if the data is deemed invalid for less than 5 seconds, the LH/RH TURN or high beam indicator remains in the last indication mode (on or off) based on the last known good request received. If the LH/RH TURN or high beam status is missing for more than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0140:00 in continuous memory and defaults the LH/RH TURN or high beam indicator off.

This pinpoint test is intended to diagnose the following:

- Turn signal concern

- High beam concern

- BCM (Body Control Module)

- IPC (Instrument Panel Cluster)

PINPOINT TEST X : THE LH/RH OR HIGH BEAM TURN INDICATOR IS NEVER/ALWAYS ON

X1 DETERMINE THE FAULT CONDITION

- Place the headlamp switch in the HIGH BEAM position.

- Ignition ON.

- Observe the high beam indicator.

Does the high beam indicator illuminate?

Yes
GO to X4.

No
LEAVE the headlamp switch in the HIGH BEAM position. GO to X2.

X2 CHECK THE HIGH BEAM HEADLAMPS OPERATION

- Observe the high beam headlamps.

Do the high beam headlamps operate correctly?

Yes
GO to X3.

No
REFER to Lighting and Horns.

X3 CARRY OUT THE IPC (Instrument Panel Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- 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. Observe the high beam indicator.

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

Yes
GO to X6.

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

X4 CHECK THE LH OR RH TURN SIGNAL LAMPS OPERATION

- Ignition ON.

- Operate the LH or RH turn signal. Observe the exterior LH or RH turn lamps.

Do the turn signal lamps operate correctly?

Yes
GO to X5.

No
REFER to Lighting and Horns.

X5 CARRY OUT THE IPC (Instrument Panel Cluster) INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

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

- Select the IPC (Instrument Panel Cluster) RH or LH turn signal indicator (RH_TURN_L) or (LH_TURN_L) active command. Command the RH or LH turn signal indicator on and off. Observe the LH or RH turn signal indicator.

Does the LH or RH turn signal indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to X6.

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

X6 RETRIEVE THE RECORDED DTCs FROM THE BCM (Body Control Module) SELF-TEST

- Check for recorded BCM (Body Control Module) DTCs from the self-test.

Are any DTCs recorded?

Yes
REFER to Body Control Systems.

No
GO to X7.

X7 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

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

Is DTC U0140:00 recorded?

Yes
GO to Pinpoint Test AQ Pinpoint Test AQ: DTC U0140:00.

No
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.