C-CLASS AIRCON

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This C-class came in with air con issues. With our machine connected the pressures were noted and found to be around the normal 10bar on the high side but nearly 0bar on the low. The high side pressures proved the compressor was pumping. The low side pressures suggested that there was a blockage. Through experience we have found the usual place for blockages would be the receiver/dryer or the expansion valve. The valve was removed which was situated at the back of the engine

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With the valve removed and examined you could see the valve was stuck closed

 

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With the valve fitted and the system charged the pressures were perfect

 

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And the temperature was perfect

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2009 BMW 3 SERIES

In this week was this BMW with indicator trouble. The indicators were flashing fast on both sides as if a bulb was blown,  all bulbs were OK.

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Using Autologic diagnostic equipment it showed a fault relating to the footwell module, which controls aswell as other systems all external lights. DSC_0682

Again using diagnostic equipment we can do a reset on this module which alot of the time can cure the fault. But after doing this the fault remained.

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So we stripped the car to gain access to the module and quickly checked all connections to the module, again all was Ok.

The BMW dealer was phoned where we were informed that they had sold 67 of these last month!  Ours will have to come from Germany as all stock in UK sold out. Once the part arrives it will need coding in.  Job done!

2009 Mercedes cls 320

Into our workshop this week was this Merc with parking assist problems and automatic door lock/unlock not working.  A full serial scan showed up 2 faulty parking sensors on the front. A check of these sensors confirmed the fault and 2 new sensors sourced.

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Next we checked the locking system, the normal way it should work is as long as you have the keys on you when you approach the car when you pull the handle on the door it should unlock for you. We stripped the drivers door down and removed the door handle that contains a microswitch that unlocks the door and found water ingress into the switch.

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WATER INGRESS

Another week, another vehicle with water ingress causing havoc with electrical systems.

We are seeing more and more cars with water ingress into the cabin and no manufacturer is immune. It seems that manufacturers are finding it hard to build cars suitable for our environment.

 

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Here we see a car with the passenger seat removed and the carpet lifted to reveal the loom and connectors submerged in water causing various systems to stay live when the car was locked up

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JAGUAR S-TYPE 2004

A busy week in our workshop with amongst other vehicles this jaguar that had various communication issues with ABS, TRACTION AND STABILITY CONTROL, ELECTRIC PARKING BRAKE.  Other garages had tried to get to the bottom of the issues but had given up.

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First we plugged in our new dealer level diagnostic equipment AUTOLOGIC and got various fault codes all attributed to the ABS MODULE . The ABS MODULE is situated behind the o/s headlight,  a visual inspection of the area showed signs of damage leading us to suspect it had been in a crash and so could have possible wiring damage around the front of the vehicle. 

The bumper was removed and the loom inspected and various broken wires repaired.  This fixed the ABS problems.

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The electric handbrake was then investigated. A common problem with this can be the module at the rear of the car above the dif.  Luckily with close inspection of the loom leading to this we found a previous repair job had failed so a new stronger repair was carried out.

A factory reset was then performed and everything worked a treat!

Another car with water ingress

We are seeing more and more cars with water ingress into wiring looms and control modules especially Fords and Renault.

Here we see a GEM unit with water ingress causing all sorts of sporadic faults with wipers, warning lights and intermittent starting. The water here was from condensation off the heater matrix DSC_0568Here at WIDNES AUTO ELECTRICAL we are experienced at the removal and repair of these and other similar control units.

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2010 C3 No sidelights

 

 

 

DSC_0637This came into our workshop this week with no sidelights and the customer having already had it into his usual garage which couldn’t locate the fault. . All the obvious checks were made first  like bulbs,fuses and switch.  Through diagnostic live data we could see the switch sending command for sidelights so that eliminated the switch and the wiring to control module.

We then unplugged the module to start checking continuity between it and the sidelights only to see this! DSC_0638

 The plug onto the module was just as bad, but unavailable as a spare part. Luckily  second hand parts were sourced locally and fitted. The customer was extremely happy at the savings against new parts and a quick and proper diagnosis.

2003 Audi A4 – Power module issues

 2003 Audi A3 - Power Module issues repaired by Widnes Auto Electrical

2003 Audi A4 – Solving the mystery power modude issues

Into our busy workshop this week from another garage was this Audi with no wipers and indicators. The other garage had tried another convenience module but the fault remained.

Being  experienced at VAG systems and with both faults being on the steering column we could trace the fault from there 

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Using accurate wiring diagrams, the signals from the steering column  go from the steering column control module to the power distribution module then that module tells the devices to work.DSC_0595

The signals were getting to the power module but it wasn’t sending them out.

A new module was sourced from the agent and plugged in no coding is necessary with this part

 

Pico scope is the most reliable way to test wiring and can signals.


 

The new power distribution module

The new power distribution module


 

 

FORD FOCUS RS – ABS Light issue

Into our workshop today was this Focus RS with an ABS light illuminated.

A quick serial scan showed front sensor faults. We performed a live data check by going for a run in the vehicle and found no communication with the front sensors.

2012 355hp

2012 355hp

Once exposed the wiring was excessively taught

Once exposed the wiring was excessively taught

once the car was lifted and the sensors examined the trouble was obvious. The common issue with the RS model is that because the car is alot wider than the regular car and they haven’t extended the wiring looms to the sensors,  the wiring is stretched excessively and can become open circuit. Repair looms were sourced from the dealer and repaired successfully.