Meriva 1.6 petrol 2004 indicators fault

[Shuggy]

hiya everyone heres a strange one for you to suss out .got a mariva in the guy said the indicators were only working on the nearside only .so he replaced the switch stalk then it still only worked on one side .
so he replaced the flasher relay now the car has no indicators and the lights on the dash are switching like hell .so is the new relay  anyone shed some light . ime thinking the b.s.m. unit is there a way to reset this ?

                                              ...thanks for lookin....shuggy....

[Barry Rudd]

Had this last week on an 06 Mareva
no inds one side,removed and refitted flasher unit and lost all inds, removed opened FLU and one set of contacts dirty-refitted and all worked again-waiting to fit new FLU. I would check he has replaced the correct relay-i understand the early ones had two separate relays and the later cars a double relay. the BCU senses the current taken and the speed of flash on the dash doesnt always relate to the true external flash rate so dirty relay contacts will affect the flash rate-still learning this one my self
cheers
Barry

[stevecrk]

Hello,

The Meriva has a BCU, which can be diagnosed, for sure. You can run output test, and with that, you can test both turn signals.

And you can read out fault codes, regarding the turn signal light.

Yes, the BCU will "sense" the operation of the turn signal light, and will flag a fault code, if this is necessary.

I would inspect the front, side, and rear turning light sockets, for loose contact, or corrosion.

I did not recommend anyone to replace a part, without further inspection.

What would happen, if you operate the hazard switch?

If the flasher relay is OK, and only the switch stalk is wrong, then you will have turning signal on each side! It's not so hard to diagnose!

Hope this helps

[Barry Rudd]

Hi Steve
although I'm a fan of Vauxcom, it didnt help in my case -the fault code was very inconclusive- some thing about feed back- and I'm sure I couldnt do output tests-will try it on another car.
The owner in my case was sure messing about with the rear lamp affected the problem but I'm convinced that handling the indicator relay affected the flash rate of this one due to the dirty contact on one of the relays-which for those that dont know is under bonnet OS wiper area-remove some wiper trim to avoid loosing skin on forearm
Barry

[paragon]

I agree with Barry.

Quite common on Meriva and Corsa, the problem will almost certainly be the flasher relay.
It should be a double relay on the Merivas but as stated some of the earlier Corsa C had two seperate relays, 1 for each side.

[stevecrk]

Hello Barry,

You could have one of the following fault text description:

B3795
-1   Turnsignal Bulb Malfunction or Feedback Signal High Voltage

B3795
-2   Turnsignal Feedback Circuit Open or Low Voltage

B3795
-8   Turnsignal Relay Stuck

If you have the last two error codes, then the "The concerned system is turned off." So, you will not have any turning light.

This is because the BCU is so "intelligent", that it could turn off the concerned system, to avoid further damage.

In these intelligent electronic control units, there is an electronic part, which sense the state of the operated circuit.

So, in this way, the control unit can "feel" the operating conditions, and could report any usuall problem. (broken wire, short circuit, etc.)

The cause of these fault codes could be a short circuit to either ground, or Vbat, or wire break (interruption), or bad contact.

And yes, you can run many output test on the BCU of the Meriva.

In the list, you will find the "Turn Signal Test.". 

The electronic background of a Meriva is quite similar to the Corsa-C, both of them have BCU.

[Shuggy]

hiya guys you certainly know your stuff.  the new relay is a double relay the switch stalk is also new .
the code i got was the return voltage low from the turn signal .tested the signal the dash lights worked at the corect speed but the external lights did not flash .ive checked each bulb front and rear the . fault now is simple but hard to. find the indicators do not flash but the dash indicator does but it flashes rapidly lik a bulb was out on either side but nothin hapens at the actual indicator bulbs . ive tried lots of diferent things but none have made a single bit of use .so thats the symptoms any thoughts very welcome....cheers

                                          ........shuggy..........

[Shuggy]

hiya ive found the printout .it reads b3795 signal light circuit open or voltage too small . ime no further forward . nothing i do makes any sence god i hate bsm faults .theyre so ilogical ! any cures before i  crack up  but cheers for the stuff so far....

                                                          .....shuggy....

[Barry Rudd]

You could test the current taken by each side to eliminate wiring faults if you cant do an actuator test, but tread carefully.
If both right and left prove OK and the Flasher relay is good and the dash tell tales work at the right rate then surely the BCU is at fault-but I would want to prove the circuit right and left first, which I understand goes from the relay out puts directly to the 3 lamps each side and unplugging the relay isolates the lamp circuits from the BCU
cheers
Barry
PS thanks  Steve , these fault codes seem vague but in laymans terms mean high or low resistance in circuit which will include bad relay contacts

[stevecrk]

Hello Barry,

Yes, as vague as seen on the TECH2. These are the exact same codes you will see on the dealer tool. Nothing less, nothing more.

Personally, I think, that a control unit never will be so intelligent, that it would be able to tell you the exact location of the fault.

All they can tell you, that currently they sense some problem in the circuit.

Of course, there is a chance, that the BCU could also be faulty.

Shuggy, do you have a circuit diagram for that particular car?

I've checked in the TIS2000, and the following contact of the BCM could be affected in this:

61, 62, 73, 87

The BCM can be found on the left side, under the hood. It has two connector, and the BCM is placed upside down.

Hope this helps.