Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Mercedes Benz S430FACTORY OEM SERVICE PROCEDURE
Pushbutton Switch (With DAS3)
NOTE:
Drive Authorization System 3 (DAS3).
Before performing testing procedures, turn ignition off. Remove instrument cluster. Disconnect cruise control switch (S40/4) connector at instrument cluster.
- Decelerate/Set - Connect DVOM between cruise control switch (S40/4) connector terminals No. 6 and 3. With pushbutton switch not actuated, resistance should be more than 20,000 ohms. With pushbutton switch in DECELERATE position, resistance should be less than one ohm. If resistance is within specification, go to next step. If resistance is not within specification, possible causes are wiring harness failure or variable cruise control switch (S40/4) defective. Repair as necessary.
- Memory - Connect DVOM between cruise control switch (S40/4) connector terminals No. 6 and 1. With pushbutton switch not actuated, resistance should be more than 20,000 ohms. With pushbutton switch in MEMORY position, resistance should be less than one ohm. If resistance is within specification, go to next step. If resistance is not within specification, possible causes are wiring harness failure or variable cruise control switch (S40/4) defective. Repair as necessary.
- Accelerate/Set - Connect DVOM between cruise control switch (S40/4) connector terminals No. 6 and 4. With pushbutton switch not actuated, resistance should be more than 20,000 ohms. With pushbutton switch in ACCELERATE position, resistance should be less than one ohm. If resistance is within specification, go to next step. If resistance is not within specification, possible causes are wiring harness failure or variable cruise control switch (S40/4) defective. Repair as necessary.
- Switch Off - Connect DVOM between cruise control switch (S40/4) connector terminals No. 6 and 5. With pushbutton switch not actuated, resistance should be less than one ohm. With pushbutton switch in OFF position, resistance should be more than 20,000 ohms. If resistance is within specification, go to next step. If resistance is not within specification, possible causes are wiring harness failure or variable cruise control switch (S40/4) defective. Repair as necessary.
- Control Switching Contact - Connect DVOM between cruise control switch (S40/4) connector terminals No. 6 and 2. With pushbutton switch not actuated, resistance should be more than 20,000 ohms. With pushbutton switch in ACCELERATE, DECELERATE, SAVE or OFF position, resistance should be less than one ohm. If resistance is within specification, go to next step. If resistance is not within specification, possible causes are wiring harness failure or variable cruise control switch (S40/4) defective. Repair as necessary.
- Changeover Between Cruise Control & Variable Speed Limitation - Connect DVOM between cruise control switch (S40/4) connector terminals No. 8 and 7. With switch sliding part not actuated, resistance should be more than 20,000 ohms. With switch sliding part actuated, resistance should be less than one ohm. If resistance is within specification, test is complete. If resistance is not within specification, possible causes are wiring harness failure or variable cruise control switch (S40/4) defective. Repair as necessary.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.