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my 166 3l v6 manual has developed an electrical fault, initial symptom was that the indicators worked on one side, but when the other side was switched on both sides worked at once, until the fuse failed there was a strong smell of burning plastic, the hazard light switch also burnt out. It's currently in the workshop, they have removed the ICS, drivers airbag, instruments etc. to get at the switch and lots of the wiring, they are saying that they can't find the short circuit/burnt out wiring without completely removing the dash so that they can see where the loom(s) pass through the bulkhead, vast amounts of work and expense. Anybody out there had experience with a problem of this sort, (they have used a camera to look for the fault) any info such as most likely place and which colours of the wiring loom to trace through would be most welcome as the car is destined for the scrap heap unless it can be traced more easily. Thanks in advance for your help.
 

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Who is doing this work? If they know about 166's they should start by replacing the light control unit which is the M45 which is behind the fuse board and or the three more control units below the ics unit which control the hazard lights and more.


The side lights and parking lights are controlled by the electronic Check device M45, that receives control signals from the switches and controls the bulbs while also checking the various lines.

The supply for the Check device M45 arrives directly from the battery. (maxifuse CENTR of B5 ) to pins 1 and 6 of connector C, via fuse F11 of junction unit B1 .

An ignition-operated power supply (INT/A) reaches pin 9 of connector C through fuse F1 of junction unit B1 : pin 7 of connector C is earthed.

The side lights switch for the exterior lights control H6 receives a go-ahead from pin 5 of connector A; when the lights are on, it sends a command to pin 4 of connector A of M45 .

In response to this signal, the Check device M45 controls the supply for the front side lights F10 (left) and F11 (right) from pins 6 and 4 of connector D; for the rear lights F30 and F35 (left) F31 and F36 (right) from pins 11, 2, 3, 12 of connector E; and, lastly, for the number plate lights F50 and F51 from pins 1 and 6 of connector E.

At the same time the 'side lights on' warning light on the instrument panel E50 , pin 5 of connector C, is turned on from pin 9 of connector B, while pin 15 of connector A supplies the ignition-controlled supply to the panel, through fuse F1 of the junction unit B1 .

The parking lights switch of the exterior lights control H6 receives enablement from pin 13 of connector A and sends the command to pin 9 of connector A of M45 .

In response to this signal, the Check device M45 controls the supply to the side lights as described above.

When the parking lights are switched on, a control is send from pin 12 of connector B to the stalk unit H5 . If from the stalk unit H5 a signal reaches pins 4 and 5 of connector B indicating the selection of the right or left indicators, the Check device M45 controls the supply of the side lights only on the selected side.

The device M45 checks the efficiency of the bulbs and their connections: if faults are detected in the circuit, the 'lights fault' warning light on the instrument panel E50 , pin 7 of connector C, is lit from pin 6 of connector A, while pin 15 of connector A supplies an ignition-operated power supply to the panel through fuse F1 of the junction unit B1 .

The exterior lights control H6 is illuminated when the ignition is on (INT/A), through the line of fuse F15 to the fuse and relay unit B1 .
 

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and hazards

The direction indicators and hazard warning lights are controlled by an electronic intermittence device R2 located in junction unit B1 .

The device power supply reaches pin 6 directly from the battery. (maxifuse CENTR of B5 ) via fuse F8 of junction unit B1 . Pin 2 is earthed.

Hazard warning light operation is controlled by a switch located in unit H35 :when the button is pressed, an earth signal is sent to pin 3 of device R2 of B1 .

Pin 2 of H35 is operated when the ignition is turned on (INT/A) via fuse F5 of junction unit B1 ; this line gives the go-ahead for lighting up the control panel H35 .

The direction indicators are activated by stalk unit H5 .

The supply is controlled by the ignition (INT/A) via fuse F1 of junction unit B1 ; when the lever is operated in both directions, a signal is sent to pin 7 (left side arrows) and pin 1 (right side arrows) for device R2 of B1 .

Intermittent device R2 of B1 generates two signals that supply the direction indicators: the right hand signal from pin 5 ( F11 , F21 , F31 ); the left hand one from pin 4 ( F10 , F20 , F30 ).

When a trailer is connected, a signal is sent from pin 8 to a special warning light located in the instrument panel E50 .

The tail-lights in clusters F30 and F31 are not conventional bulbs but electronic leds. A special turn signal control unit M83 is therefore fitted. This monitors tail-light activation signals to detect anomalies and controls the various warning lights.

The power supply to device M83 reaches pin 2 directly from the battery. (maxifuse CENTR of B5 ) via fuse F8 of junction unit B1 . Pin 1 is earthed.

Pins 6 and 7 receive signals from device R2 of B1 for right and left hand side operation.

The device is connected to the direction indicators: located in clusters F30 and F31 with two feedbacksignals from pins 9 and 8.

The warning lights for the direction indicators, located inside the instrument panel E50 , are also operated by pins 4 and 5. pin 3 activates the red LED in switch H35 which lights up the ideogram with the hazard warning lights switched on.

All the hazard warning lights are also operated by the alarm system control unit M30 (pins 1 and 2 of connector B), which is connected directly to the light power supply ( See E7015 ALARM ).
 

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best get a scrap one, however there are two different types, one for xenons and one for halogens. They seem reliable, so are available cheaply, I got a Xenon for 99p off the bay. I doubt a dealer could beat that :lol:
 

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best get a scrap one, however there are two different types, one for xenons and one for halogens. They seem reliable, so are available cheaply, I got a Xenon for 99p off the bay. I doubt a dealer could beat that :lol:
:cheese: Now that's a dickensens real deal that is....even I can only match it...Free postage ?;) Wells yeeze awe ken moi by noo.:lol:

Pomeo
 

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I had the same problem yesterday in at my local alfa guy, and he has detected an actual fault with the hazzard switch itself which is part of the whole pannal, when this switch is disconnected everything else works, it initially blew the 8 fuse and smoke came out from round the hazzard lights area. So anybody got a pannel with hazzard switch intact,
 
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