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

Instrumentation, Message Center and Warning Chimes

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 (Electronic Locking Differential) mode, the TCCM (Transfer Case Control Module) sends the IPC (Instrument Panel Cluster) a message to illuminate the ELD (Electronic Locking Differential) message center indicator. If the vehicle is shifted out of ELD (Electronic Locking Differential) mode, the TCCM (Transfer Case Control Module) sends the IPC (Instrument Panel Cluster) a message to turn off the ELD (Electronic Locking Differential) message center indicator, informing the driver the vehicle has shifted out of ELD (Electronic Locking Differential) mode.

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

This pinpoint test is intended to diagnose the following:

- Message center concern

- ELD (Electronic Locking Differential) concern

- TCCM (Transfer Case Control Module)

PINPOINT TEST AD : THE ELD (Electronic Locking Differential) 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 Test AF: The Message Center Is Not Operating Correctly

AD2 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

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

Is DTC U0102:00 recorded?

Yes
GO to Pinpoint Test AU. Pinpoint Test AU: DTC U0102:00
No
GO to AD3.

AD3 RETRIEVE THE RECORDED DTCs FROM THE TCCM (Transfer Case Control Module) SELF-TEST

- Check for recorded TCCM (Transfer Case Control Module) DTCs from the self-test.

Are any DTCs recorded?

Yes
REFER to Transfer Case.
No
GO to AD4.

AD4 CHECK THE 4X4 OPERATION

- Start the engine.

- Shift the transfer case into 4WD (Four-Wheel Drive) mode.

Does the transfer case shift into 4WD (Four-Wheel Drive) mode?

Yes
INSTALL a new TCCM (Transfer Case Control Module).
No
REFER to Transfer Case to diagnose 4WD (Four-Wheel Drive) concerns.