Pinpoint Test H: Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate
Four Wheel Drive (4WD) Systems - Electronic Shift
Pinpoint Tests
Pinpoint Test H: Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate
Refer to Wiring Diagram Set 34, Four-Wheel Drive System for schematic and connector information. Diagrams By Number
Normal Operation
The 4X4 LOW and 4X4 indicator status is transmitted to the Instrument Cluster (IC) from the 4X4 control module through the Controller Area Network (CAN), circuits VDB04 (WH/BU) and VDB05 (WH). A steady indicator displays whether the vehicle is in 4X4 LOW or 4X4 HIGH mode, according to the driver selection. Flashing 4X4 and 4X4 LOW indicators are an indication that the IC has lost communication with the 4X4 control module. For information about CAN, refer to Module Communications Network Testing and Inspection.
This pinpoint test is intended to diagnose the following:
- Four-Wheel Drive (4WD) system fault
- CAN circuits
- 4X4 control module
- IC
PINPOINT TEST H: THE FOUR-WHEEL DRIVE (4WD) INDICATORS DO NOT OPERATE CORRECTLY/DO NOT OPERATE
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H1 CHECK THE 4WD INDICATOR PROVE-OUT
- Ignition OFF.
- Ignition ON.
- Do the 4WD indicators prove out correctly?
Yes
GO to H2.
No
CHECK the IC for faults. REFER to Instrument Cluster and Panel Illumination Testing and Inspection.
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H2 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the on-demand self test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to H3.
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H3 CHECK THE 4X4 INDICATORS IN 2H
- Switch the Mode Select Switch (MSS) to 2H.
- Do any of the 4WD indicator(s) illuminate?
Yes
GO to H5.
No
GO to H4.
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H4 CHECK THE 4X4 HIGH INDICATORS IN 4H
- Switch the MSS to 4H.
- Monitor the 4X4 IC indicator.
- Does only the 4X4 IC indicator illuminate?
Yes
GO to H6.
No
GO to H7.
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H5 CHECK THE TRANSFER CASE CONTACT PLATE POSITION PIDs IN 2H
- Using the active command contact plate power (PLATE_PWR) to energize the transfer case motor contact plate position return circuit.
- Monitor the 4X4 control module Transfer Case Contact Plate Switch A (PLATE_A), B (PLATE_B), C (PLATE_C) and D (PLATE_D) PIDs in 2H.
- Do the PIDs indicate that the motor is in the 2WD position?
Yes
CHECK the IC for faults. REFER to Instrumentation and Warning Chimes Testing and Inspection.
No
GO to Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between 2-Wheel Drive (2WD) and Four-Wheel Drive (4WD) Modes Correctly
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H6 CHECK THE INDICATORS IN 4L
- With the vehicle at a stop and the transmission in NEUTRAL, switch the MSS to 4L.
- Monitor the 4X4 LOW IC indicator.
- Does only the 4X4 LOW IC indicator illuminate?
Yes
The 4WD indicators are operating correctly. CARRY OUT the Electronic Shift-On-The-Fly (ESOF) Functional Test. GO to Pinpoint Test G. Pinpoint Test G: Electronic Shift-On-The-Fly (ESOF) Functional Test
No
GO to H8.
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H7 CHECK THE TRANSFER CASE CONTACT PLATE POSITION PIDs IN 4H
- Switch the MSS to 4H.
- Using the active command contact plate power (PLATE_PWR) to energize the transfer case motor contact plate position return circuit.
- Monitor the 4X4 control module Transfer Case Contact Plate Switch A (PLATE_A), B (PLATE_B), C (PLATE_C) and D (PLATE_D) PIDs in 4H.
- Do the PIDs indicate that the motor is in the 4X4 HIGH position?
Yes
CHECK the IC for faults. REFER to Instrument Cluster and Panel Illumination Testing and Inspection.
No
GO to Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between 2-Wheel Drive (2WD) and Four-Wheel Drive (4WD) Modes Correctly
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H8 CHECK THE TRANSFER CASE CONTACT PLATE POSITION PIDs IN 4L
- Using the active command contact plate power (PLATE_PWR) to energize the transfer case motor contact plate position return circuit.
- Monitor the 4X4 control module Transfer Case Contact Plate Switch A (PLATE_A), B (PLATE_B), C (PLATE_C) and D (PLATE_D) PIDs in 4L.
- Do the PIDs indicate that the motor is in the 4X4 LOW position?
Yes
CHECK the IC for faults. REFER to Instrument Cluster and Panel Illumination Testing and Inspection.
No
GO to Pinpoint Test D. Pinpoint Test D: The Vehicle Does Not Shift Between Four-Wheel Drive (4WD) High and Four-Wheel Drive (4WD) Low Correctly
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