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.
2002 Chrysler Voyager ECFACTORY OEM SERVICE PROCEDURE
High Beam Switch Input Short
NOTE:
After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Turn the ignition on. With the DRBIII®, clear all BCM DTC's. Actuate the High Beams. With the DRBIII®, read the DTC information. If the DRBIII® reads: High Beam Switch Input Short, go to the next step. If the DRBIII® does not read: High Beam Switch Input Short, the condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Turn the ignition off. Disconnect the Multifunction Switch harness connector. See Fig 1. Turn the ignition on. With the DRBIII®, read the Multifunction Switch voltage. If the voltage is above 4.8 volts, replace the Multifunction Switch. See STEERING COLUMN SWITCHES article. If the voltage is below 4.8 volts, go to the next step.
- Turn the ignition off. Disconnect the Body Control Module harness connector. See Figure. Disconnect the Multifunction Switch Harness connector. See Fig 1. Measure the resistance between the High Beam Switch MUX circuit and ground. If the resistance is below 5 ohms, repair the High Beam Switch MUX circuit for a short to ground. If the resistance is above 5 ohms, go to the next step.
- Turn the ignition off. Disconnect the Body Control Module harness connector. See Figure. Disconnect the Multifunction Switch harness connector. See Fig 1. Measure the resistance between the Multifunction Switch MUX Return circuit and the High Beam Switch MUX circuit. If the resistance is below 5 ohms, repair the High Beam Switch MUX circuit for a short to the Multifunction Switch MUX Return circuit. If the resistance is above 5 ohms, the test is complete.
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.