Pinpoint Test AB: The 4X4 Auto, 4X4 Low, 4X4 High Or 4X2 Message Center Indicator Is Never/Always On (If Equipped)

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AB: The 4X4 Auto, 4X4 Low, 4X4 High Or 4X2 Message Center Indicator Is Never/Always On (If Equipped)


Normal Operation

The Instrument Panel Cluster (IPC) receives the Four-Wheel Drive (4WD) status from the Transfer Case Control Module (TCCM) over the High Speed Controller Area Network (HS-CAN). If the vehicle is shifted into 4X4 auto, 4WD (Four-Wheel Drive) low or high, the TCCM (Transfer Case Control Module) sends the IPC (Instrument Panel Cluster) a message to illuminate the 4X4 auto, 4X4 low or 4X4 high message center indicator. If the vehicle is shifted out of either 4X4 auto, 4X4 low or 4X4 high into 4X2 mode, the TCCM (Transfer Case Control Module) sends the IPC (Instrument Panel Cluster) a message to illuminate the 4X2 message center indicator, informing the driver the vehicle has shifted into 4X2 mode.

If the 4X4 status message is missing for less than 5 seconds, the IPC (Instrument Panel Cluster) defaults the applicable 4X4 message center indicator to the last on/off state, based upon the last known good ABS status message received.

If the 4X4 status message is missing for greater than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0102:00 and defaults the applicable 4X4 message center indicator off.

This pinpoint test is intended to diagnose the following:

- Message center concern

- 4WD (Four-Wheel Drive) concern

- TCCM (Transfer Case Control Module)

PINPOINT TEST AB : THE 4X4 AUTO, 4X4 LOW, 4X4 HIGH OR 4X2 MESSAGE CENTER INDICATOR IS NEVER/ALWAYS ON (IF EQUIPPED)

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

AB1 VERIFY THE OPERATION OF THE DOOR AJAR MESSAGE CENTER WARNING INDICATOR

- Close all doors then open the LH front door.

- Ignition ON.

- NOTE: If multiple warnings are present, the message center cycles through each of the warning indicators. 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 AB2.
No
GO to Pinpoint Test AF. Pinpoint Test AF: The Message Center Is Not Operating Correctly

AB2 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 U0102:00 recorded?

Yes
GO to Pinpoint Test AU. Pinpoint Test AU: DTC U0102:00
No
GO to AB3.

AB3 RETRIEVE THE RECORDED DTCs FROM THE TCCM (Transfer Case Control Module) SELF-TEST

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

Are any DTCs recorded?

Yes
REFER to Transfer Case.
No
GO to AB4.

AB4 CHECK THE 4WD (Four-Wheel Drive) SYSTEM OPERATION

- Test drive the vehicle and operate the 4WD (Four-Wheel Drive) system.

Does the 4WD (Four-Wheel Drive) system operate correctly?

Yes
INSTALL a new TCCM (Transfer Case Control Module). TEST the system for normal operation.
No
REFER to Transfer Case.