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, 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 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
- IPC

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

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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.

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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 Exterior Lighting Testing and Inspection.

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X3 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC 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. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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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 Exterior Lighting Testing and Inspection.

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X5 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC 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. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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X6 RETRIEVE THE RECORDED DTCs FROM THE BCM SELF-TEST

- Check for recorded BCM DTCs from the self-test.
- Are any DTCs recorded?

Yes
REFER to Multifunction Electronic Modules Testing and Inspection.

No
GO to X7.

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X7 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Is DTC U0140:00 recorded?

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

No
INSTALL a new BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). TEST the system for normal operation.

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