Fixing the 4WD Issue on a Toyota Tundra
Troubleshooting the Blinking 4H Light
If your Toyota Tundra's 4WD system is not engaging and you see a blinking 4H light, there are a few potential causes to investigate.
The Actuator
The most common issue is a faulty actuator. This component is responsible for engaging the 4WD system and allowing the front half-shafts to be connected. If the actuator is malfunctioning, it can prevent the 4WD from engaging.
The 4WD Switch
Another possible cause is a faulty 4WD switch. This switch is located on the dashboard and is used to select between 2WD and 4WD. If the switch is malfunctioning, it can prevent the 4WD system from engaging.
The 4WD Control Module
The 4WD control module is the brain of the 4WD system. It receives signals from the 4WD switch and actuator and sends commands to the various components to engage or disengage the 4WD system. If the control module is malfunctioning, it can prevent the 4WD from engaging.
Harness Continuity
It's also important to check the continuity of the harness that connects the 4WD switch, actuator, and control module. If there is a break in the harness, it can prevent the 4WD system from engaging.
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