Need location of fog lite control module - 2001 Audi A4

The most likely cause is a 'short' in the wiring. Remove the light fitting and take a good look at the connections on the actual light fitting. Look for dirty or damaged parts. Check the wires and the connector blocks are clean, shiny and are not damaged. Then check the light fitting itself for damage. Check the seal where the light fitting fits against the bodywork. If moisture or water is getting past it can affect the lights.

There is no replaceable fog lamp relay. It's built into the digital instrument panel junction box (IP) and switches power using an intelligent power switch (power transistor) that's soldered to the board.
When you turn on fog lamps the body control module sees the signal from the fog lamp switch. It sends a digital signal to the IP which tells the IPS to power the fog lights. You need to use a pro scan tool to see if the Body control module is receiving the fog lamp request and then see the IP is receiving the command to switch on fog lamps.

System Description EKS0058X Control of the fog lamps is dependent upon the position of the combination switch (lighting switch). The lighting switch must be in the 2ND position or AUTO position (LOW beam is ON) for front fog lamp operation.When the lighting switch is placed in the fog lamp position the BCM (body control module) receives input signal requesting the fog lamps to illuminate. When the headlamps are illuminated, this input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The central processing unit of the IPDM E/R controls the front fog lamp relay coil. When activated, this relay directs power to the front fog lamps. OUTLINE Power is supplied at all times ? through 15A fuse [No. 43, located in the IPDM E/R (intelligent power distribution module engine room)] ? to front fog lamp relay, located in the IPDM E/R (intelligent power distribution module engine room) ? through 15A fuse [No. 34, located in the IPDM E/R (intelligent power distribution module engine room)] ? to CPU (central processing unit) in the IPDM E/R (intelligent power distribution module engine room). Power is also supplied at all times ? through 50A fusible link (letter f , located in the fuse and fusible link box) ? to BCM (body control module) terminal 55 ? through 10A fuse [No. 21, located in the fuse block (J/B)] ? to BCM (body control module) terminal 42. When the ignition switch is in ON or START position, power is supplied ? to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room) ? through 10A fuse [No. 1 located in the fuse block (J/B)] ? to BCM (body control module) terminal 38. When the ignition switch is in ACC or ON position, power is supplied

pull out on the lite switch and fog lites should come on

Connector 1:
Fuse Block - Underhood Label (2.2L, 2.4L)
Connector 2:
Fuse Block - Underhood Top View (2.2L, 2.4L)
Connector 3:
Fuse Block - Underhood Bottom View (2.2L, 2.4L)
Connector 4:
Fuse Block - Underhood C1 (2.2L, 2.4L)
Connector 5:
Fuse Block - Underhood C2 (2.2L, 2.4L)
Connector 6:
Fuse Block - Underhood C3 (2.2L, 2.4L)
Connector 7:
Fuse Block - Underhood Label (2.0L)
Connector 8:
Fuse Block - Underhood Top View (2.0L)
Connector 9:
Fuse Block - Underhood Bottom View (2.0L)
Connector 10:
Fuse Block - Underhood C1 (2.0L)
Connector 11:
Fuse Block - Underhood C2 (2.0L)
Connector 12:
Fuse Block - Underhood C3 (2.0L)
Connector 13:
Body Control Module (BCM) Label
Connector 14:
Body Control Module (BCM) Top View
Connector 15:
Body Control Module (BCM) Bottom View
Connector 16:
Body Control Module (BCM) C1
Connector 17:
Body Control Module (BCM) C2
Connector 18:
Body Control Module (BCM) C3
Connector 19:
Body Control Module (BCM) C4
Connector 20:
Body Control Module (BCM) C5 (UE1)
Fuse Block - Underhood Label (2.2L, 2.4L)
2.2L

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2.4L

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Fuse Block - Underhood Label Usage (2.2L, 2.4L)
No.

Device

Rating

Description
1

ECM (2.4L)/TCM Fuse
10A

ECM (2.4L)/TCM
2-3

--
--

Not Used
4

RH HDLP Fuse
15A

Headlamp - Right
5

A/C Fuse
10A

A/C CLUTCH Relay
6-7

--
--

Not Used
8

ABS Fuse
10A

EBCM (JM4)
9

ECM/ETC Fuse
15A

ECM
10

EMISS Fuse
15A

EVAP Canister Purge Solenoid, Coolant Level Switch, MAF Sensor, HO2S 1, and HO2S 2
11
IGN Fuse
10A
ICM and PNP Switch (A/T)
12
--
--
Not Used
13
TRANS2 Fuse
10A
ECM, Automatic Transmission
14
TRANS1 Fuse
10A
TCM (MN5)
15
BACK UP Fuse
10A
PNP Switch (A/T) or Backup Lamp Switch (M/T)
16
INJECTORS Fuse
10A
Fuel Injectors 1-4
17
FOG LP Fuse
10A
FOG LAMP Relay (T37)
FOG LP Fuse
15A
FOG LAMP Relay (T96)
18
LH HDLP Fuse
15A
Headlamp - Left
19
WIPER Fuse
25A
WIPER 1 Relay
20
HORN Fuse
10A
HORN Relay
21
RADIO Fuse
20A
Audio Amplifier (UZ6)
22
ABS Fuse
20A
EBCM (JM4)
23
RR DEFOG Fuse
30A
REAR DEFOG Relay
24
A/C CLUTCH Relay
--
A/C Compressor Clutch

Dodge does not use a fuse to control those lamps. Dodge uses a Totally Integrated Power Module or TIPM which controls the power to the lamps. This thing is located in the Engine Compartment in that big Fuse Box next to the engine. The unit is not a fuse but rather a self contained processor that regulates power to the Fog Lamps. This unit is replace as an assembly as it is not user serviceable. But before replacing it make sure the lamps actually work as simple as that is it is often overlooked. One more thing Dodge has employed the use of Circuit Breakers in the Wiring Harness so make sure they are working as well.

You can not have High Beams on and FOG LIGHTS at the same time. The Body Control Module controls this. You may have a bad Body control Module

The fog lamps are computer controlled .the body control module (BCM) will energize the fog lamp relay control circuit. The BCM receives the park lamp ON signal from the interior park lamps supply voltage signal circuit.
DTC B2527 Front Fog Lamps Circuit Low
The body control module (BCM) monitors the front fog lamp switch signal circuit in order to determine when the fog lamp relay is to be energized. When the BCM senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch, the BCM energizes the fog lamp relay by grounding the fog lamp relay control circuit.

Your best bet , take it to the dealer . Could need BCM replaced , would need to do testing using the Tech 2 scan tool . A new BCM has to be programmed .

Body Control Module (BCM) Replacement
If the body control module (BCM) is replaced, the following procedures must be performed in the following order:
BCM Reprogramming--Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
Important: This procedure has to be performed only for vehicles equipped with the Passlock™ System.
Theft Learn--Refer to Programming Theft Deterrent System Components in Theft Deterrent. A new BCM will learn the Passlock™ information automatically, but the powertrain control module (PCM) must still learn the theft information from the BCM.

I have not run into this problem before. Usually, people either purchase the vehicle equipped with fog lamps from the factory or they add aftermarket fog lamps to the vehicle after purchase. In your case, you are trying to connect factory lamps that were not there from the factory? I'm not sure that you will find the connectors you are looking for. I do know for certain that the factory fog lamps are computer-controlled and that if the vehicle was not equipped with them from the factory, then the computer will not be programmed to make them work. If the wiring and connectors are there at all, they will be coming from the Totally Integrated Power Module (TIPM) located on the left fender. The factory wires are WHITE/YELLOW for the left fog lamp and WHITE/ORANGE for the right fog lamp. What about control switches,wire, etc. Did you purchase all of that as well?

The fog Lamp fuse is located in the interior fuse panel located inside the vehicle to the left of the steering. The fuse your looking for is in the # 24 cavity (Which should be marked by numbers) and it will/should be a 15 amp fuse (lite blue). I hope this helped and good luck.