Troubleshooting Troubleshooting – Electrical (including Instruments) Estimated reading: 3 minutes Contributors Overview This guide provides troubleshooting steps for common electrical and instrument issues specific to the Porsche 944S2 (3.0L, 1989–1991). It addresses problems such as wipers, blower motor, reverse lights, cooling fans, power windows, power mirrors, dash lights, rear defroster, battery discharge, blown fuses, and turn signal issues. Proper diagnosis and repair of these issues are critical to maintaining the functionality and reliability of your 944S2’s electrical systems. Troubleshooting – Electrical (including Instruments) The following sections outline specific electrical system problems, their possible causes, checks, and repair procedures tailored for the Porsche 944S2. Wipers, Blower Motor, Reverse Lights, Cooling Fans, Power Windows, and Power Mirrors Stopped Working Possible Causes Checks Procedure Relay X Bad Remove Relay X from terminal board and install jumper in place of primary contacts to see if functions are restored. N/A Dash Lights Are Too Dim Possible Causes Checks Procedure Flaking of instrument bezel reflective coating, burned out bulbs, or bulb wattage too low. Refer to Instrument Panel Light procedure. ELECT-08 Rear Defroster Does Not Work Possible Causes Checks Procedure Damaged lug, damaged grid, loss of power. Refer to Rear Hatch Defroster Troubleshooting and Repair procedure. ELECT-05 Battery Goes Dead After a Short Period of Time Possible Causes Checks Procedure Possible ground on electrical system. Use the Excessive Battery Discharge Rate procedure to try and isolate the problem. ELECT-26 Fuse #11 Blown Possible Causes Checks Procedure Ground in glove compartment light wiring. The red wire on the glove compartment light of 944S2 models could rub against the metal brace above the glove compartment, causing fuse #11 to blow. This could be intermittent. Bend the red wire down away from the brace or switch the red and brown wire positions on the light assembly. This issue was addressed by TSB-98902. Instrument Panel Gauge Not Working Properly Possible Causes Checks Procedure Faulty gauge, sensor, or wiring. Troubleshoot using Sensors and Gauges procedure. ELECT-19 Turn Signal Blinks Faster on One Side Possible Causes Checks Procedure Dirty bulb socket or bulb contacts. A rapidly blinking turn signal on one side is the result of a dirty bulb holder or dirty bulb contacts. Remove the turn signal bulbs on the side that is blinking rapidly and clean the bulb sockets with a wire brush. Clean the contacts on the bulb with emery cloth or other mildly abrasive material. Coat the bulb contacts with a light coating of dielectric grease and reinstall. Turn Signal Light Comes On But Does Not Blink Possible Causes Checks Procedure Bad bulb or flasher relay. If your turn signal light comes on but does not blink on one side, you most likely have a bad bulb on that side. Remove the bulbs and determine which bulb is bad by looking for a broken filament in the bulbs. If the turn signal lights come on but do not blink on either side, your flasher relay is most likely bad and should be replaced. N/A Sources Clark’s Garage Pelican Parts Porsche 944 Workshop Manuals YouTube Troubleshooting – Electrical (including Instruments) - PreviousTroubleshooting – Suspension and SteeringNext - Troubleshooting – Electrical (including Instruments)Miscellaneous
