Audi A6 2005 LH Rear Turn Signal & Brake Light Failure

The turn signal lamps on your vehicle are controlled by the GEM - generic electronic module . Have the car checked for DTC'S - diagnostic trouble codes . Auto part stores can not check these code's , need a factory or professional type scan tool . These codes (if any) would point to the problem area . They flash faster because the GEM see's a problem and it's a warning indicator something is wrong , they made it like that so you go to the dealer . Principles of Operation
When the multifunction switch is placed in the LH or RH TURN positions, a voltage signal from the GEM is routed to ground. When the GEM detects the multifunction switch in the LH or RH TURN position, the GEM supplies voltage to the appropriate turn lamps in a flashing manner.
When the hazard warning switch is pressed, a voltage signal from the GEM is routed to ground. When the GEM detects a request for the hazard lamps, the GEM supplies voltage to all the turn signal lamps in a flashing manner. When operating correctly, the hazard lamps flash approximately 80 times per minute.

Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1499 Lamp Turn Signal Left Circuit Failure GEM Go To Pinpoint Test L . B1503 Lamp Turn Signal Right Circuit Failure GEM Go To Pinpoint Test L . B1875 Turn Signal/Hazard Switch Signal Circuit Failure GEM Go To Pinpoint Test M . B2281 Right Turn Switch Short to Ground GEM Go To Pinpoint Test K . B2282 Left Turn Switch Short to Ground GEM Go To Pinpoint Test K .

Do you know anything about automotive electronics ?
Stoplamps
The stoplamps are part of the rear lamp assembly. When the brake pedal is applied, the stoplamp switch supplies voltage to the generic electronic module (GEM) and the high mounted stoplamp. The GEM then supplies voltage to the rear lamps.

Turn Signal Lamps and Hazard Warning Lamps
The turn signal lamps and hazard warning lamps system consists of:

• Hazard switch
• Multifunction switch
• GEM
• Turn signal lamps

When the multifunction switch is placed in the LH or RH turn positions, a voltage signal from the GEM is routed to ground. When the GEM detects the multifunction switch in the LH or RH turn position, the GEM supplies voltage to the appropriate turn lamps in a flashing manner. When operating correctly, the turn lamps flash approximately 80 times per minute.
When the hazard warning switch (located in the upper part of the center console) is switched on, a voltage signal from the GEM is routed to ground. When the GEM detects that the hazard switch is switched on, the GEM supplies voltage to all the turn signal lamps in a flashing manner. When operating correctly, the hazard lamps flash approximately 80 times per minute.

Do you know how to test electrical circuits with a DVOM - digital volt ohm meter , how to read an use a wiring diagram to pin point locations in a electrical circuit for testing B+ voltage an ground ?

Free wiring diagrams
http://www.bbbind.com/free_tsb.html Enter your vehicle info . year ,make , model an engine size . Under system click on lighting ,then under subsystem click on turn signal lamps . Click the search button then each blue link , one at a time .


Electric Testing Techniques You Need to Know
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you might access the ABS & ESP ECU (Electronic Control Unit) using diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored.
Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC stocked inside ABS ECU & reset it.

The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty. You must access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: brake pedal switch, front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.
I'm convinced that your brake pedal switch is faulty because the glow plug warning sign went ON after ESP warning light. Just replace the brake pedal switch, see if rear stop lamps light when press the brake pedal, and test the car on the road.
Good Luck!

For Audi A4 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram.
First fuse on first row from left upper corner is Fuse Nr.20 = F20 (15A) - RH headlamp low beam, headlamp adjustment.
First fuse on second row from left upper corner is Fuse Nr.21 = F21 (15A) - LH headlamp low beam, headlamp adjustment.

You have a short within the wires of the turn signal switch and hazard switch. You might need a new dashboard

have someone stand behind ur car and check ur brake lights when u hit the brake and not ur tail lights when u turn all ur lights on. that warning light came on for me and i discovered a brake light out

your owner manual sould have fuse chart. Some fuses/ekays in enine compartment. Some in car on left side of instrument panel

in car


Fuse Amps Circuits Protected 1 10 Power Mirrors, Anti-Theft Warning Light, Diagnostic Connector 2 5 Generic Electronic Module, Start Interrupt Relay Coil 3 5 Radio Illumination, Remote Radio Illumination, Electronic Instrument Cluster, Electronic Instrument Cluster PRNDL Illumination, Electronic Instrument Cluster Switch Module, Analog Cluster Illumination, Instrument Illumination 4 — Not Used 5 — Not Used 6 15 Rear Quarter Windows (LH and RH) 7 15 High Mounted Stoplamp, Brake Shift Interlock 8 25 Subwoofer, JBL Amplifier 9 10 Park and Turn Lamps, Side Marker Lamps, License Lamps, Stop Lamps 10 2 High Beam Indicator Electronic Cluster 11 15 Park Lamps 12 10 Remote Radio, Auxiliary Warning Lamp Module, Remote Keyless Entry (RKE) Module, Anti-Theft Controller Module, Radio Illumination 13 15 Radio, CD Disc Changer 14 5 Electronic Chromatic Mirror, Analog Cluster Indicator Lamps, Air Bag Module 15 — Not Used 16 15 Horns, Horn Relay Coil 17 15 Fog Lamps 18 25 Front Wiper Motor, Front Washer Pump, Wiper/Washer Relays 19 10 Generic Electronic Module (Pin 57), Electronic Instrument Cluster 20 25 Integrated Relay Control Module, Ignition Coil 21 10 Air Bag Module, Rear Window Defrost Relay, A/C Clutch, Temp Blend Door Actuator, Brake Shift Interlock 22 20 Rear Cigar Lighter, Power Plug 23 15 Multi-Function Switch 24 20 Rear Wiper Motor, Rear Washer Pump 25 10 Turn Signal Lamps, Instrument Cluster Turn Indicator 26 15 LH Aero Headlamp, Left and Right Trailer Stop/Turn/Hazard 27 15 Hazard Warning Lamps, Instrument Cluster Turn Indicator 28 15 Instrument Panel Cigar Lighter 29 15 Battery Saver Relay, Interior Lamp Control Relay, Interior Lamps, RH and LH Keyhole Lamps 30 25 Backup Lamps, Electronic Cluster 31 10 Rear Air Suspension 32 15 RH Aero Headlamp, Trailer Park Lamps 33 15 Anti-Lock Brake (ABS) Relay, Anti-Lock Brake (ABS) Module, Daytime Running Lamp (DRL) Module 34 30 One Touch Relay, LH Window Motor 35 15 Anti-Theft Controller Module 36 30 A/C Mode Switch 37 20 Door Lock Actuators, Memory Door Lock Relay 38 15 Heated Mirrors (LH and RH) 39 30 Auxiliary Blower Motor, Ref. Valve Solenoid 40 30 Window Motor (RH) 41 5 Autolamp Relay Coils, Autolamp Sensor 42 — — 43 — — 44 — —

take the bulb back out have someone sit in car apply brake get your self a circuit tester and check to see if this circuit is carrying efficient 12 volt current! some times in cold weather these bulbs get hot with long period of breaking and when released condensate and rust begins and you get what you have perhaps bad socket! this would be a ideal location to begin and probably end,