Pinpoint Test AL: The 4X4 High/Low Message Center Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AL: The 4X4 High/Low Message Center Indicator Is Never/Always On
Normal Operation
On the Manual Shift-On-Stop (MSOS) Four-Wheel Drive (4WD) system, the Instrument Panel Cluster (IPC) receives the 4X4 high and 4X4 low input hardwired from the 4X4 high/low indicator switch (mode indication switch). When 4X4 high is selected, the 4X4 high/low indicator switch provides a ground on the 4X4 high input circuit. When 4X4 low is selected, the 4X4 high/low indicator switch provides a ground on both the 4X4 low input circuit and the 4X4 high input circuit. The IPC (Instrument Panel Cluster) monitors the 4X4 high and 4X4 low inputs and when the applicable grounding is detected, the IPC (Instrument Panel Cluster) turns on the appropriate 4X4 message center indicator.
On the Electronic Shift-On-The-Fly (ESOF) 4WD (Four-Wheel Drive) system, the IPC (Instrument Panel Cluster) receives the 4X4 high and 4X4 low input from the Transfer Case Control Module (TCCM) over the High Speed Controller Area Network (HS-CAN) communication bus. When 4X4 high or 4X4 low is selected, the 4X4 control module sends the IPC (Instrument Panel Cluster) the appropriate 4X4 indicator request.
On the ESOF (Electronic Shift-On-The-Fly) 4WD (Four-Wheel Drive) system, if the 4X4 indicator request is missing for less than 5 seconds, the 4X4 high and 4X4 low indication remains in the last indication state (on or off) based upon the last known good message received. If the 4X4 indicator request is missing for more than 5 seconds, the IPC (Instrument Panel Cluster) sets DTC U0102:00 continuous memory and defaults the 4X4 high and 4X4 low indicators inactive (off).
This pinpoint test is intended to diagnose the following:
- Message center concern
- Wiring, terminals or connectors
- 4WD (Four-Wheel Drive) mode indication switch
- TCCM (Transfer Case Control Module)
PINPOINT TEST AL : THE 4X4 HIGH/LOW MESSAGE CENTER INDICATOR IS NEVER/ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
AL1 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 telltale warning indicator active?
Yes
GO to AL2.
No
GO to Pinpoint Test AN. Pinpoint Test AN: The Door Ajar Message Center Warning Indicator Is Never/Always On
AL2 CHECK THE 4WD (Four-Wheel Drive) SYSTEM OPERATION
- Operate the 4WD (Four-Wheel Drive) system.
Does the 4WD (Four-Wheel Drive) system operate correctly?
Yes
For the MSOS (Manual Shift-On-Stop) 4WD (Four-Wheel Drive) system 4X4 high or 4X4 low indicator is never on, GO to AL3.
For the MSOS (Manual Shift-On-Stop) 4WD (Four-Wheel Drive) system 4X4 high or 4X4 low indicator is always on, GO to AL5.
For the ESOF (Electronic Shift-On-The-Fly) 4WD (Four-Wheel Drive) system, GO to AL7.
No
REFER to Transfer Case.
AL3 CHECK THE 4WD (Four-Wheel Drive) MODE INDICATION SWITCH OPERATION
- Ignition OFF.
- Disconnect: 4WD (Four-Wheel Drive) Mode Indication Switch C3146.
- For both the 4X4 low and 4X4 high indicators, connect a fused jumper wire between the 4WD (Four-Wheel Drive) mode indication switch C3146-2 (4X4 low), circuit CCF06 (BU/GN or GN/BU), harness side and ground; and between the 4WD (Four-Wheel Drive) mode indication switch C3146-1, circuit CCF22 (BU/OG or WH/BU), harness side and ground (4X4 high).
- For the 4X4 high indicator, connect a fused jumper wire between the 4WD (Four-Wheel Drive) mode indication switch C3146-1, circuit CCF22 (BU/OG or WH/BU), harness side and ground.
- Ignition ON.
Does the 4X4 indicator illuminate?
Yes
REMOVE the jumper wire. INSTALL a new 4WD (Four-Wheel Drive) mode indication switch. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to AL4.
AL4 CHECK THE 4X4 LOW OR 4X4 HIGH INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: IPC (Instrument Panel Cluster) C220.
- For both the 4X4 low and 4X4 high indicators, measure the resistance between the IPC (Instrument Panel Cluster) C220-16, circuit CCF06 (BU/GN), harness side and the 4WD (Four-Wheel Drive) mode indication switch C3146-2, circuit CCF06 (BU/GN or GN/BU), harness side.
- For the 4X4 high indicator, measure the resistance between the IPC (Instrument Panel Cluster) C220-17, circuit CCF22 (BU/OG), harness side and the 4WD (Four-Wheel Drive) mode indication switch C3146-1, circuit CCF22 (BU/OG or WH/BU), harness side.
Is the resistance less than 5 ohms?
Yes
GO to AL10.
No
REPAIR the circuit in question. TEST the system for normal operation.
AL5 CHECK THE 4WD (Four-Wheel Drive) MODE INDICATION SWITCH FOR A SHORT TO GROUND
- Place the 4WD (Four-Wheel Drive) system in the 2WD (2-Wheel Drive) mode.
- Ignition OFF.
- Disconnect: IPC (Instrument Panel Cluster) C220.
- Measure the resistance between the IPC (Instrument Panel Cluster) C220-16, circuit CCF06 (BU/GN), harness side and ground (4X4 low) and between the IPC (Instrument Panel Cluster) C220-17, circuit CCF22 (BU/OG), harness side and ground (4X4 high).
Are the resistances greater than 10,000 ohms?
Yes
INSTALL a new 4WD (Four-Wheel Drive) mode indication switch. TEST the system for normal operation.
No
GO to AL6.
AL6 CHECK THE 4X4 LOW OR 4X4 HIGH INPUT CIRCUITS FOR A SHORT TO GROUND
- Disconnect: 4WD (Four-Wheel Drive) Mode Indication Switch C3146.
- Measure the resistance between the IPC (Instrument Panel Cluster) C220-16, circuit CCF06 (BU/GN), harness side and ground (4X4 low) and between the IPC (Instrument Panel Cluster) C220-17, circuit CCF22 (BU/OG), harness side and ground (4X4 high).
Are the resistances greater than 10,000 ohms?
Yes
GO to AL10.
No
REPAIR the circuit in question. TEST the system for normal operation.
AL7 RETRIEVE AND RECORD THE IPC (Instrument Panel Cluster) DTCs FROM THE SELF-TEST
- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.
Are any DTCs recorded?
Yes
For DTC U0102:00, GO to Pinpoint Test BC. Pinpoint Test BC: DTC U0102:00
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to AL8.
AL8 RETRIEVE AND RECORD THE TCCM (Transfer Case Control Module) DTCs FROM THE 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 AL9.
AL9 CHECK THE TCCM (Transfer Case Control Module) FOR CORRECT OPERATION
- Disconnect all the TCCM (Transfer Case Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the TCCM (Transfer Case Control Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new TCCM (Transfer Case Control Module). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
AL10 CHECK FOR CORRECT IPC (Instrument Panel Cluster) OPERATION
- Disconnect the IPC (Instrument Panel Cluster) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC (Instrument Panel Cluster) connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.