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Symptom: IGNITION MUX SWITCH INPUT OPEN - BCM When Monitored and Set Condition: IGNITION MUX SWITCH INPUT OPEN - BCM When Monitored: When the BCM detects battery voltage on Ignition Run/Start input. Set Condition: The BCM detects the Ignition MUX Switch Input voltage is greater than 4.78 volts for 2 seconds. POSSIBLE CAUSES IGNITION SWITCH SENSE CIRCUIT SHORT TO VOLTAGE IGNITION SWITCH SENSE CIRCUIT OPEN IGNITION SWITCH SENSE RETURN CIRCUIT OPEN IGNITION SWITCH TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → Repair the Ignition Switch Sense circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. No → Go To 2 2 Turn the ignition off. t, read DTCs. Does the DRBIII t display 9Ignition MUX Switch Input Short9? All Yes → Go To 3 No → Repair the Ignition Switch Sense circuit for an open. Perform BODY VERIFICATION TEST - VER 1. 3 Turn the ignition off. t, read DTCs. Does the DRBIII t display 9Ignition MUX Switch Input Short9? All Yes → Replace the Ignition Switch in accordance with the Service Information. No → Repair the Ignition Switch Sense Return circuit for an open. Perform BODY VERIFICATION TEST - VER 1. 681 IGNITION, POWER, ACCESSORY |