Pinpoint Test W: The Four-Wheel Drive (4WD) Low/4WD High Indicator Is Never/Always On
Instrumentation and Warning Chimes
Pinpoint Tests
Pinpoint Test W: The Four-Wheel Drive (4WD) Low/4WD High Indicator Is Never/Always On
Normal Operation
The Instrument Cluster (IC) receives the 4WD status from the 4x4 control module over the High Speed Controller Area Network (HS-CAN) communication bus. When the 4WD mode switch is in the 4WD high position, the 4WD high (4x4) indicator illuminates. When the 4WD mode switch is in the 4WD low position, the 4WD low (4x4 LOW) indicator illuminates.
- DTC U0102 (Lost Communication With the Transfer Case Control Module) - a continuous DTC that sets in the IC if the 4WD status message is missing for more than 5 seconds and the IC turns on both the 4WD high and 4WD low indicators.
This pinpoint test is intended to diagnose the following:
- 4x4 control module
- IC
PINPOINT TEST W: THE 4WD LOW/4WD HIGH INDICATOR IS NEVER/ALWAYS ON
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W1 CHECK THE 4WD OPERATION
- Verify the operation of the 4WD function.
- Does the 4WD function correctly?
Yes
GO to W2.
No
REFER to Four Wheel Drive (4WD) Systems Testing and Inspection.
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W2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST
- Retrieve the recorded DTCs from the IC self-test.
- Is DTC U0102 retrieved?
Yes
GO to Pinpoint Test AL. Pinpoint Test AL: DTC U0102
No
GO to W3.
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W3 CARRY OUT THE IC 4WD TRANSFER CASE CONTROL ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC 4WD low (LOW_LAMP) or 4WD high (HIGH_LAMP) active command. Command the 4WD low or 4WD high warning lamp on then off again. Observe the 4WD low or 4WD high indicator.
- Does the 4WD low or 4WD high indicator illuminate when commanded on and turn off when commanded off?
Yes
INSTALL a new 4X4 control module. REFER to Four Wheel Drive (4WD) Systems Service and Repair. TEST the system for normal operation.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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