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4. ISOLATE THE SHORT TO VOLTAGE IN THE (W513) HORN MUTE REQUEST SIGNAL CIRCUIT Turn the ignition off. Disconnect the Multi-Purpose Module (Police And Taxi Interface Mod- Turn the ignition on. Measure the voltage of the (W513) Horn Mute Request Signal circuit Is there any voltage present? Yes >> Repair the (W513) Horn Mute Request Signal circuit for a short to voltage. Perform BODY VERIFICATION TEST – VER 1. (Refer to No >> Refer to electrical diagnostics for the aftermarket light/siren controller, and repair or replace the aftermarket light siren Perform BODY VERIFICATION TEST – VER 1. (Refer to BODY VERIFICATION TEST – VER 1). 5. CHECK THE (W513) HORN MUTE REQUEST SIGNAL CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the Multi-Purpose Module (Police And Taxi Interface Mod- Measure the resistance of the (W513) Horn Mute Request Signal circuit Is the resistance below 5.0 ohms? Yes >> Go To 6. No >> Repair the (W513) Horn Mute Request Signal circuit for an open or high resistance. 8M - 106 MESSAGE CENTER - ELECTRICAL DIAGNOSTICS LX |