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• When Monitored: • Set Condition: Possible Causes (W501) REAR FLASHING LIGHTS SIGNAL CIRCUIT OPEN OR SHORTED TO VOLTAGE AFTERMARKET LIGHT/SIREN CONTROLLER MULTI-PURPOSE MODULE (POLICE AND TAXI INTERFACE MODULE-PTIM) 1. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS With the scan tool, read all active DTCs from all modules. NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or igni- Does the scan tool display any active DTCs to the conditions listed above? Yes >> Diagnose and repair the DTC. Refer to the Table of Contents in ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS for a complete list of the symptoms. Perform BODY VERIFICATION TEST – VER 1. (Refer to BODY VERIFICATION TEST – VER 1). No >> Go To 2. Diagnostic Test 2. CHECK FOR ACTIVE DTC With the scan tool, read the active DTCs. Erase the DTCs. Turn the ignition off, wait 10 seconds, then turn the ignition on. With the scan tool, read the active DTC’s. Does the scan tool display this DTC as active? Yes >> Go To 3. No >> If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness con- nectors. Look for broken, bent, pushed out, or corroded terminals, and repair any obvious problems. Perform BODY VERIFICATION TEST – VER 1. (Refer to BODY VERIFICATION TEST – VER 1). 3. CHECK THE (W501) REAR FLASHING LIGHTS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Multi-Purpose Module (Police And Taxi Interface Mod- Turn the ignition on. Measure the voltage of the (W501) Rear Flashing Lights Signal circuit Is there any voltage present? Yes >> Go To 4. No >> Go To 5. 8M - 58 MESSAGE CENTER - ELECTRICAL DIAGNOSTICS LX |