Rheostat Volume Control Test
NOTE:
Rheostat and rheostat volume control are separate components. Rheostat is an electronic module that receives signals from rheostat volume control (control wheel).
Remove instrument cluster. Remove rheostat volume control. Replace rheostat volume control if it does not operate as follows.
- Connect a jumper wire between positive terminal of a 12-volt battery and terminal No. 2 of rheostat volume control connector. See Fig 1. Ground terminal No. 4. Connect voltmeter between terminals No. 2 and 3. While turning control wheel, voltage should increase and decrease.
- Disconnect all jumper wires. Connect a jumper wire between positive terminal of 12-volt battery and terminal No. 2. Connect another jumper wire between positive terminal of 12 -volt battery and terminal No. 5. Ground terminal No. 4. Connect voltmeter between terminals No. 5 and 7. While turning control wheel, voltage should increase and decrease.
- Disconnect all jumper wires. Check for continuity between terminals No. 5 and 6. With control wheel turned fully clockwise, there should be no continuity. With control wheel in any other position, there should be continuity.