Pinpoint Tests AD: The Electronic Locking Differential (ELD) Message Center Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AD: The Electronic Locking Differential (ELD) Message Center Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the Electronic Locking Differential (ELD) status from the Transfer Case Control Module (TCCM) over the High Speed Controller Area Network (HS-CAN). If the vehicle is shifted into ELD mode, the TCCM sends the IPC a message to illuminate the ELD message center indicator. If the vehicle is shifted out of ELD mode, the TCCM sends the IPC a message to turn off the ELD message center indicator, informing the driver the vehicle has shifted out of ELD mode.

If the ELD status message is missing or invalid for less than 5 seconds, the ELD warning indicator remains in the last state (on or off), based upon the last known good ELD status message received. If the ELD status message is missing for more than 5 seconds, the IPC sets DTC U0102:00 in continuous memory and defaults the ELD warning indicator off.

This pinpoint test is intended to diagnose the following:

- Message center concern
- ELD concern
- TCCM

PINPOINT TEST AD: THE ELD MESSAGE CENTER INDICATOR IS NEVER/ALWAYS ON

-------------------------------------------------
AD1 VERIFY THE OPERATION OF THE DOOR AJAR MESSAGE CENTER WARNING INDICATOR

- Close all doors then open the LH front door.

- NOTE: If multiple warnings are present, the message center cycles through each of the warnings. Allow the displays to cycle through each display while determining whether the door ajar message center warning indicator is active.

- Observe the message center.
- Is the door ajar message center warning indicator active?

Yes
GO to AD2.

No
GO to Pinpoint Test AF. Pinpoint Tests AF: The Message Center Is Not Operating Correctly

-------------------------------------------------
AD2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Is DTC U0102:00 recorded?

Yes
GO to Pinpoint Test AU. Pinpoint Tests AU: DTC U0102:00

No
GO to AD3.

-------------------------------------------------
AD3 RETRIEVE THE RECORDED DTCs FROM THE TCCM SELF-TEST

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

Yes
REFER to Four Wheel Drive (4WD) Systems .

No
GO to AD4.

-------------------------------------------------
AD4 CHECK THE 4X4 OPERATION

- Start the engine.
- Shift the transfer case into 4WD mode.
- Does the transfer case shift into 4WD mode?

Yes
INSTALL a new TCCM. REFER to Four Wheel Drive (4WD) Systems .

No
REFER to Four Wheel Drive (4WD) Systems to diagnose 4WD concerns.

-------------------------------------------------